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Posted to users@tomcat.apache.org by Randhir Singh <ra...@sterlite.com> on 2014/04/08 13:05:16 UTC
How to monitor performance of tomcat
We have an application which has JBoss as the application server with
Tomcat as the web server, our application has Oracle 11g as the database. I
would give some further background to the issue we are facing, since the
last 1 1/2 months, the application slows down. Sometimes it comes back to
normal, specially on week-ends. But other times we restart JBoss & Tomcat
to bring back the application to normal.
We have been using jconsole to monitor tomcat like
jconsole 10.101.17.79:8891
which monitors our tomcat for a work order system. If the memory usage does
not show spike and shows constant reading, the GC button is clicked to
invoke the garbage collector.
I checked out on the net and got some clue as below:
1) Javamelody - It seems to be a 3rd party tool which is not
recommended.
2) There is a command mentioned to see the admin console,
http://<IP:port>/ but it is not displaying the required page.
Please give your inputs whether jconsole should be a help in the right
direction or some other way to monitor the performance of Tomcat.
Regards
--
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Please consider environment before printing this email !
Re: How to monitor performance of tomcat
Posted by Leon Rosenberg <ro...@gmail.com>.
How about http://www.moskito.org ?
It has everything you need including full control of jmx beans, memory
management, threads, your beans/pojos/classes, filters, urls, what not...
regards
Leon
On Tue, Apr 8, 2014 at 1:05 PM, Randhir Singh <ra...@sterlite.com>wrote:
> We have an application which has JBoss as the application server with
> Tomcat as the web server, our application has Oracle 11g as the database. I
> would give some further background to the issue we are facing, since the
> last 1 1/2 months, the application slows down. Sometimes it comes back to
> normal, specially on week-ends. But other times we restart JBoss & Tomcat
> to bring back the application to normal.
>
>
>
> We have been using jconsole to monitor tomcat like
>
>
>
> jconsole 10.101.17.79:8891
>
>
>
> which monitors our tomcat for a work order system. If the memory usage does
> not show spike and shows constant reading, the GC button is clicked to
> invoke the garbage collector.
>
>
>
> I checked out on the net and got some clue as below:
>
>
>
> 1) Javamelody - It seems to be a 3rd party tool which is not
> recommended.
>
> 2) There is a command mentioned to see the admin console,
> http://<IP:port>/ but it is not displaying the required page.
>
>
>
> Please give your inputs whether jconsole should be a help in the right
> direction or some other way to monitor the performance of Tomcat.
>
>
>
> Regards
>
> --
>
> *STL Disclaimer:*
> The content of this message may be legally privileged and confidential and
> are for the use of the intended recipient(s) only. It should not be read,
> copied and used by anyone other than the intended recipient(s). If you have
> received this message in error, please immediately notify the sender,
> preserve its confidentiality and delete it. Before opening any attachments
> please check them for viruses and defects. No employee or agent is
> authorised to conclude any binding agreement on behalf of Sterlite
> Technologies Limited with another party by email without express written
> confirmation by authorised person. Visit us at
> www.sterlitetechnologies.com
> Please consider environment before printing this email !
>
>
>
>
>
Re: How to monitor performance of tomcat
Posted by Арсений Зинченко <se...@gmail.com>.
Hi.
We use JavaMelody for "moment performance checks" on test box and Zabbix
monitoring system to have whole history. Zabbix can use JMX connection to
Tomcat instance and have set of included teamplates, for example - number
of threads, current memory usage, gzip usage and so on. Main virtue of
Zabbix ++ JMX is that it store all data in database + can draw graphs.
2014-04-08 18:00 GMT+03:00 Jeffrey Janner <Je...@polydyne.com>:
> > -----Original Message-----
> > From: Randhir Singh [mailto:randhir.singh@sterlite.com]
> > Sent: Tuesday, April 08, 2014 6:05 AM
> > To: users@tomcat.apache.org
> > Subject: How to monitor performance of tomcat
> >
> > We have an application which has JBoss as the application server with
> > Tomcat as the web server, our application has Oracle 11g as the
> > database. I would give some further background to the issue we are
> > facing, since the last 1 1/2 months, the application slows down.
> > Sometimes it comes back to normal, specially on week-ends. But other
> > times we restart JBoss & Tomcat to bring back the application to
> > normal.
> >
> >
> >
> > We have been using jconsole to monitor tomcat like
> >
> >
> >
> > jconsole 10.101.17.79:8891
> >
> >
> >
> > which monitors our tomcat for a work order system. If the memory usage
> > does not show spike and shows constant reading, the GC button is
> > clicked to invoke the garbage collector.
> >
> >
> >
> > I checked out on the net and got some clue as below:
> >
> >
> >
> > 1) Javamelody - It seems to be a 3rd party tool which is not
> > recommended.
> >
> > 2) There is a command mentioned to see the admin console,
> > http://<IP:port>/ but it is not displaying the required page.
> >
> >
> >
> > Please give your inputs whether jconsole should be a help in the right
> > direction or some other way to monitor the performance of Tomcat.
> >
> Jconsole and JVisualVm are quite useful tools for basic monitoring, if you
> understand how to use them and their limitations.
> Why did you get the impression that JavaMelody is not recommended? It
> does offer an awful lot of monitoring/debugging information, but you need
> to careful in setting it up. Under Tomcat 7, it will autodeploy with no
> security by default and expose a lot of potentially confidential
> information to whomever connects using the well-known "context" for it
> (which can't be changed). If you want to use it, I suggest limiting it to
> your development environment only, or reading up on how to secure it as
> best as possible.
> Jeff
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
RE: How to monitor performance of tomcat
Posted by Jeffrey Janner <Je...@PolyDyne.com>.
> -----Original Message-----
> From: Randhir Singh [mailto:randhir.singh@sterlite.com]
> Sent: Tuesday, April 08, 2014 6:05 AM
> To: users@tomcat.apache.org
> Subject: How to monitor performance of tomcat
>
> We have an application which has JBoss as the application server with
> Tomcat as the web server, our application has Oracle 11g as the
> database. I would give some further background to the issue we are
> facing, since the last 1 1/2 months, the application slows down.
> Sometimes it comes back to normal, specially on week-ends. But other
> times we restart JBoss & Tomcat to bring back the application to
> normal.
>
>
>
> We have been using jconsole to monitor tomcat like
>
>
>
> jconsole 10.101.17.79:8891
>
>
>
> which monitors our tomcat for a work order system. If the memory usage
> does not show spike and shows constant reading, the GC button is
> clicked to invoke the garbage collector.
>
>
>
> I checked out on the net and got some clue as below:
>
>
>
> 1) Javamelody - It seems to be a 3rd party tool which is not
> recommended.
>
> 2) There is a command mentioned to see the admin console,
> http://<IP:port>/ but it is not displaying the required page.
>
>
>
> Please give your inputs whether jconsole should be a help in the right
> direction or some other way to monitor the performance of Tomcat.
>
Jconsole and JVisualVm are quite useful tools for basic monitoring, if you understand how to use them and their limitations.
Why did you get the impression that JavaMelody is not recommended? It does offer an awful lot of monitoring/debugging information, but you need to careful in setting it up. Under Tomcat 7, it will autodeploy with no security by default and expose a lot of potentially confidential information to whomever connects using the well-known "context" for it (which can't be changed). If you want to use it, I suggest limiting it to your development environment only, or reading up on how to secure it as best as possible.
Jeff
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Re: How to monitor performance of tomcat
Posted by Shanti Suresh <sh...@umich.edu>.
Hi Randhir,
Have you considered taking a thread dump of the JVM processes, I forget?
http://wiki.apache.org/tomcat/HowTo#How_do_I_obtain_a_thread_dump_of_my_running_webapp_.3F
If you take multiple thread dumps, say, 6, a minute apart, then you may
open these up in a thread dump analyzer such as TDA or Samurai and see what
threads are deadlocked, or how they are progressing etc. Then restart
Tomcats to fix problem. Then analyze the thread dumps post-restart. I
find thread and heap dumps useful in addition to monitoring metrics.
Thanks,
-Shanti
On Tue, Apr 15, 2014 at 6:49 AM, Randhir Singh
<ra...@sterlite.com>wrote:
> There is 1 finding. We normally monitor the tomcat port using jconsole as-
>
> jconsole 10.101.17.79:8891
>
> As per my initial query, our application hangs and we need to restart
> JBoss & Tomcat. I have observed that during this time the port 8891 does
> not respond as the command,
>
> jconsole 10.101.17.79:8891
>
> does not give any console for monitoring.
>
> Requesting an update so that the root cause analysis of this issue can be
> found out.
>
> Regards
>
> -----Original Message-----
> From: Shanti Suresh [mailto:shanti@umich.edu]
> Sent: Saturday, April 12, 2014 1:12 AM
> To: Tomcat Users List
> Subject: Re: How to monitor performance of tomcat
>
> On Fri, Apr 11, 2014 at 3:04 PM, André Warnier <aw...@ice-sa.com> wrote:
>
> > Shanti Suresh wrote:
> >
> >> Hi Chris,
> >>
> >> On Fri, Apr 11, 2014 at 12:17 PM, Christopher Schultz <
> >> chris@christopherschultz.net> wrote:
> >>
> >> -----BEGIN PGP SIGNED MESSAGE-----
> >>> Hash: SHA256
> >>>
> >>> Shanti,
> >>>
> >>> On 4/11/14, 9:01 AM, Shanti Suresh wrote:
> >>>
> >>>> Thank you! Great presentation and most wonderful notes! One
> >>>> question - on slide #48, where the notes say, "You can see here
> >>>> that the current usage is about 100MiB, less than the 115MiB
> >>>> threshold we set", where is the 100MB or thereabouts shown? Is it
> >>>> the committed value? I don't follow that statement.
> >>>>
> >>> The statement refers to the "used" value.
> >>>
> >>> - -chris
> >>>
> >>> Thank you! I got it.
> >>>
> >>
> >> The "used" value says "used 114510568". I was looking for a value
> >> closer to 100MiB.
> >>
> >
> > 114510568 (~ 109 MB)
> > - 104857600 (100 MB)
> > ===========
> > 9652968 (~ 9 MB)
> >
> > How much closer were you looking for ?
>
>
> Well, I don't know, maybe 1 or 2 MiB over? The threshold is 115 MiB, so
> if the notes had said "the current usage is less than the 115MiB threshold
> we set", I might not have had any doubt.
>
>
> >
> >
> >> So in the slide, you were making a point of the current usage being
> >> less than the threshold, basically, if I am not mistaken.
> >>
> >> Thanks,
> >>
> >> -Shanti
> >>
> >>
> >
> Thanks,
>
> -Shanti
>
> --
>
> *STL Disclaimer:*
> The content of this message may be legally privileged and confidential and
> are for the use of the intended recipient(s) only. It should not be read,
> copied and used by anyone other than the intended recipient(s). If you have
> received this message in error, please immediately notify the sender,
> preserve its confidentiality and delete it. Before opening any attachments
> please check them for viruses and defects. No employee or agent is
> authorised to conclude any binding agreement on behalf of Sterlite
> Technologies Limited with another party by email without express written
> confirmation by authorised person. Visit us at
> www.sterlitetechnologies.com
> Please consider environment before printing this email !
>
>
>
>
>
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>
Re: How to monitor performance of tomcat
Posted by Konstantin Kolinko <kn...@gmail.com>.
2014-04-15 14:49 GMT+04:00 Randhir Singh <ra...@sterlite.com>:
> There is 1 finding. We normally monitor the tomcat port using jconsole as-
>
> jconsole 10.101.17.79:8891
>
> As per my initial query, our application hangs and we need to restart
> JBoss & Tomcat. I have observed that during this time the port 8891 does
> not respond as the command,
>
> jconsole 10.101.17.79:8891
>
> does not give any console for monitoring.
>
> Requesting an update so that the root cause analysis of this issue can be
> found out.
>
An often cause for such behaviour is an out-of-memory condition.
If you encountered OutOfMemoryError: PermGen error, then JVM will not
be able to load any new classes, with obvious fatal consequences.
Did you monitor the PermGen memory pool size, or just memory as a whole?
If an OOME causes a thread death, it is usually not logged to logging
frameworks, but a message in written to System.err (by
ThreadGroup,uncaughtException(..)).
2014-04-15 17:40 GMT+04:00 Shanti Suresh <sh...@umich.edu>:
>
> Have you considered taking a thread dump of the JVM processes, I forget?
>
+1
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Re: How to monitor performance of tomcat
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Randir,
On 5/21/14, 8:32 AM, Randhir Singh wrote:
> There is a correction as JAVA_OPTS variable is defined in
> catalina.sh under $CATALINA_HOME/bin and we use
> $CATALINA_HOME/bin/startup.sh to start tomcat.
> $CATALINA_HOME/bin/startup.sh has the code like below ,
startup.sh calls catalina.out.
Do not modify either of these files. Instead, set anything you need in
setenv.sh (which you may have to create because it does not exist by
default).
Also, you probably want to use CATALINA_OPTS and not JAVA_OPTS. Read
the documentation at the top of catalina.sh to understand why.
- -chris
> ----------------------------------------------------------------------------------------------------------------------------------------------
>
>
PRGDIR=`dirname "$PRG"`
> EXECUTABLE=catalina.sh
>
> # Check that target executable exists if $os400; then # -x will
> Only work on the os400 if the files are: # 1. owned by the user #
> 2. owned by the PRIMARY group of the user # this will not work if
> the user belongs in secondary groups eval else if [ ! -x
> "$PRGDIR"/"$EXECUTABLE" ]; then echo "Cannot find
> $PRGDIR/$EXECUTABLE" echo "The file is absent or does not have
> execute permission" echo "This file is needed to run this program"
> exit 1 fi fi
> ----------------------------------------------------------------------------------------------------------------------------------------------
>
> I had changed catalina.sh in our development environment like a
> week back and want to implement it in the production environment
> but I got this doubt. I feel catalina.sh is invoked by startup.sh
> but am not sure. I have already taken downtime for production
> tomorrow but I got this doubt whether changing the
>
> JAVA_OPTS="$JAVA_OPTS -Xms1303m -Xmx1303m -XX:MaxPermSize=256m
> -Dcwom.bl.ip=127.0.0.1 -Dcwom.bl.port=1399" to
>
> JAVA_OPTS="$JAVA_OPTS -Xms2048m -Xmx2048m -XX:MaxPermSize=512m
> -Dcwom.bl.ip=127.0.0.1 -Dcwom.bl.port=1399"
>
> in catalina.sh would have the affect of increasing the heap &
> Permgen memory in Tomcat.
>
> I hope my query is clear as am quite anxious as I have a downtime
> scheduled tomorrow.
>
> Requesting a reply on priority.
>
>
> On Mon, May 5, 2014 at 3:37 PM, Randhir Singh
> <ra...@sterlite.com>wrote:
>
>> Thanks Chris for your answer.
>>
>> I researched a lot and want to try out an option for OOME:
>>
>> The JAVA_OPTS variable in $CATALINA_HOME/bin/startup.sh has the
>> value as:
>>
>> JAVA_OPTS="$JAVA_OPTS -Xms1303m -Xmx1303m -XX:MaxPermSize=256m
>> -Dcwom.bl.ip=127.0.0.1 -Dcwom.bl.port=1399"
>>
>> I checked for free space on the VM instance with Red Hat Linux as
>> the OS on which the Tomcat is hosted with a total memory of 19
>> GB, I found that there is around 8 GB of free space in the
>> server.
>>
>> I am planning to increase the memory allocation for Heap size and
>> PermGen size to almost double as below:
>>
>> JAVA_OPTS="$JAVA_OPTS -Xms2048m -Xmx2048m -XX:MaxPermSize=512m
>> -Dcwom.bl.ip=127.0.0.1 -Dcwom.bl.port=1399"
>>
>> I hope, this should avoid the hang-up issues where Tomcat does
>> not seem to respond. I plan to implement this in the UAT
>> environment at first and see how it goes.
>>
>> There is another thing I wanted to try. We have RHEL 5.8 Beta
>> (Tikanga) version and lot of updates from Red Hat are pending
>> which can update the version to RHEL 5.10 (Tikanga). Would this
>> patching help as lot of updates are pending?
>>
>> Regards
>>
>> -----Original Message----- From: Christopher Schultz
>> [mailto:chris@christopherschultz.net] Sent: Monday, April 28,
>> 2014 6:46 PM To: Tomcat Users List Subject: Re: How to monitor
>> performance of tomcat
>>
> Randir,
>
> On 4/28/14, 6:46 AM, Randhir Singh wrote:
>>>> Thanks for your valuable inputs. I am a bit of a novice to
>>>> this. When this problem happens, it is quite a loss of face
>>>> in front of the users who are widely spread geographically. I
>>>> checked the catalina.out logs on the 2 days that the problem
>>>> happened on 23rd & 25th April, the findings are as below:
>>>>
>>>> 23rd April '14:
>>>>
>>>> The catalina.out log showed the message like,
>>>> ----------------------------------------------------------------------
>>>>
>>>>
- ----------------------------------------------------------------------
>>>> -----------
>>>>
>>>>
> Caused by: org.jboss.remoting.InvocationFailureException: Socket
> timed out.
>>>> Waited 300000 milliseconds for response while calling on
>>>> InvokerLocator [socket://<hostname of our
>>>> machine>:4173/?invokerDestructionDelay=5000&timeout=300000];
>>>> nested exception is: java.net.SocketTimeoutException: Read
>>>> timed out
>>>> ----------------------------------------------------------------------
>>>>
>>>>
- ----------------------------------------------------------------------
>>>> -----------
>>>>
>>>> 3 times among other exceptions in a span of around 2
>>>> minutes.
>>>>
>>>> 25th April '14:
>>>>
>>>> The errors captured in the logs were like,
>>>> ----------------------------------------------------------------------
>>>>
>>>>
- ----------------------------------------------------------------------
>>>> -----------
>>>>
>>>>
> java.lang.OutOfMemoryError: GC overhead limit exceeded
>>>> ----------------------------------------------------------------------
>>>>
>>>>
- ----------------------------------------------------------------------
>>>> -----------
>>>>
>>>> 4 times among other exceptions in a span of around 2
>>>> minutes.
>>>>
>>>> Requesting a reply on this.
>
> It sounds like you have all kinds of problems:
>
> 1. Bad performance under unspecified conditions 2. Application hang
> under unspecified conditions 3. catalina.out file grows quickly,
> may fill filesystem 4. Long timeouts on the server-side during some
> unspecified operation (I don't know what an InvokerLocator is) 5.
> OOME
>
> It seems to me that you should focus on one of these problems
> (probably the OOME) and get that fixed, first. You may find it is
> the root of all other problems.
>
> This community can only help you so much with so little
> information. You may have to hire someone to help you through this
> process.
>
> -chris
>
>>>> -----Original Message----- From: Jeffrey Janner
>>>> [mailto:Jeffrey.Janner@PolyDyne.com] Sent: Monday, April 21,
>>>> 2014 7:26 PM To: 'Tomcat Users List' Subject: RE: How to
>>>> monitor performance of tomcat
>>>>
>>>>> -----Original Message----- From: Randhir Singh
>>>>> [mailto:randhir.singh@sterlite.com] Sent: Monday, April 21,
>>>>> 2014 5:17 AM To: Tomcat Users List Subject: RE: How to
>>>>> monitor performance of tomcat
>>>>>
>>>>> Hi,
>>>>>
>>>>> I wanted input from the experts on my query below that the
>>>>> port 8891 does not respond when the command,
>>>>>
>>>>> jconsole 10.101.17.79:8891
>>>>>
>>>>> is issued when the application hangs and stops responding.
>>>>>
>>>>> Requesting inputs so that the root cause analysis of this
>>>>> issue can be found out.
>>>>>
>>>>> Regards
>>>>>
>>>> Randhir - Your actual first request in this thread was
>>>> apparently a request for opinions on monitoring tools. This
>>>> problem of actual hangs wasn't brought up until a week later.
>>>> Here is what I've usually found when Tomcat stops responding
>>>> and even the monitoring port is unreachable via jconsole and
>>>> other tools: Your JVM has crashed for some reason. At this
>>>> point, you need to refer to the Tomcat logs, your application
>>>> logs, etc. in order to find the root cause. If the JVM is
>>>> still "running", try taking a couple of thread dumps and
>>>> review them to find your root cause. Jeff
>>>>
>>>> ---------------------------------------------- T ususcib,
>>>> -mil uer-ususcib@tmct.paheor oraditonl omans,e-ai:
>>>> ses-el@tmct.paheor
>>>>
>>
>> ---------------------------------------------------------------------
>>
>>
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
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>
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Re: How to monitor performance of tomcat
Posted by Randhir Singh <ra...@sterlite.com>.
Hi,
There is a correction as JAVA_OPTS variable is defined in catalina.sh under
$CATALINA_HOME/bin and we use $CATALINA_HOME/bin/startup.sh to start
tomcat. $CATALINA_HOME/bin/startup.sh has the code like below ,
----------------------------------------------------------------------------------------------------------------------------------------------
PRGDIR=`dirname "$PRG"`
EXECUTABLE=catalina.sh
# Check that target executable exists
if $os400; then
# -x will Only work on the os400 if the files are:
# 1. owned by the user
# 2. owned by the PRIMARY group of the user
# this will not work if the user belongs in secondary groups
eval
else
if [ ! -x "$PRGDIR"/"$EXECUTABLE" ]; then
echo "Cannot find $PRGDIR/$EXECUTABLE"
echo "The file is absent or does not have execute permission"
echo "This file is needed to run this program"
exit 1
fi
fi
----------------------------------------------------------------------------------------------------------------------------------------------
I had changed catalina.sh in our development environment like a week back
and want to implement it in the production environment but I got this
doubt. I feel catalina.sh is invoked by startup.sh but am not sure. I have
already taken downtime for production tomorrow but I got this doubt whether
changing the
JAVA_OPTS="$JAVA_OPTS -Xms1303m -Xmx1303m -XX:MaxPermSize=256m
-Dcwom.bl.ip=127.0.0.1 -Dcwom.bl.port=1399" to
JAVA_OPTS="$JAVA_OPTS -Xms2048m -Xmx2048m
-XX:MaxPermSize=512m -Dcwom.bl.ip=127.0.0.1 -Dcwom.bl.port=1399"
in catalina.sh would have the affect of increasing the heap & Permgen
memory in Tomcat.
I hope my query is clear as am quite anxious as I have a downtime scheduled
tomorrow.
Requesting a reply on priority.
On Mon, May 5, 2014 at 3:37 PM, Randhir Singh <ra...@sterlite.com>wrote:
> Thanks Chris for your answer.
>
> I researched a lot and want to try out an option for OOME:
>
> The JAVA_OPTS variable in $CATALINA_HOME/bin/startup.sh has the value as:
>
> JAVA_OPTS="$JAVA_OPTS -Xms1303m -Xmx1303m -XX:MaxPermSize=256m
> -Dcwom.bl.ip=127.0.0.1
> -Dcwom.bl.port=1399"
>
> I checked for free space on the VM instance with Red Hat Linux as the OS on
> which the Tomcat is hosted with a total memory of 19 GB, I found that there
> is around 8 GB of free space in the server.
>
> I am planning to increase the memory allocation for Heap size and PermGen
> size to almost double as below:
>
> JAVA_OPTS="$JAVA_OPTS -Xms2048m -Xmx2048m -XX:MaxPermSize=512m
> -Dcwom.bl.ip=127.0.0.1
> -Dcwom.bl.port=1399"
>
> I hope, this should avoid the hang-up issues where Tomcat does not seem to
> respond. I plan to implement this in the UAT environment at first and see
> how it goes.
>
> There is another thing I wanted to try. We have RHEL 5.8 Beta (Tikanga)
> version and lot of updates from Red Hat are pending which can update the
> version to RHEL 5.10 (Tikanga). Would this patching help as lot of updates
> are pending?
>
> Regards
>
> -----Original Message-----
> From: Christopher Schultz [mailto:chris@christopherschultz.net]
> Sent: Monday, April 28, 2014 6:46 PM
> To: Tomcat Users List
> Subject: Re: How to monitor performance of tomcat
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
> Randir,
>
> On 4/28/14, 6:46 AM, Randhir Singh wrote:
> > Thanks for your valuable inputs. I am a bit of a novice to this.
> > When this problem happens, it is quite a loss of face in front of the
> > users who are widely spread geographically. I checked the catalina.out
> > logs on the 2 days that the problem happened on 23rd & 25th April, the
> > findings are as below:
> >
> > 23rd April '14:
> >
> > The catalina.out log showed the message like,
> > ----------------------------------------------------------------------
> > ----------------------------------------------------------------------
> > -----------
> >
> >
> Caused by: org.jboss.remoting.InvocationFailureException: Socket timed out.
> > Waited 300000 milliseconds for response while calling on
> > InvokerLocator [socket://<hostname of our
> > machine>:4173/?invokerDestructionDelay=5000&timeout=300000];
> > nested exception is: java.net.SocketTimeoutException: Read timed out
> > ----------------------------------------------------------------------
> > ----------------------------------------------------------------------
> > -----------
> >
> > 3 times among other exceptions in a span of around 2 minutes.
> >
> > 25th April '14:
> >
> > The errors captured in the logs were like,
> > ----------------------------------------------------------------------
> > ----------------------------------------------------------------------
> > -----------
> >
> >
> java.lang.OutOfMemoryError: GC overhead limit exceeded
> > ----------------------------------------------------------------------
> > ----------------------------------------------------------------------
> > -----------
> >
> > 4 times among other exceptions in a span of around 2 minutes.
> >
> > Requesting a reply on this.
>
> It sounds like you have all kinds of problems:
>
> 1. Bad performance under unspecified conditions 2. Application hang under
> unspecified conditions 3. catalina.out file grows quickly, may fill
> filesystem 4. Long timeouts on the server-side during some unspecified
> operation (I don't know what an InvokerLocator is) 5. OOME
>
> It seems to me that you should focus on one of these problems (probably the
> OOME) and get that fixed, first. You may find it is the root of all other
> problems.
>
> This community can only help you so much with so little information.
> You may have to hire someone to help you through this process.
>
> - -chris
>
> > -----Original Message----- From: Jeffrey Janner
> > [mailto:Jeffrey.Janner@PolyDyne.com] Sent: Monday, April 21, 2014
> > 7:26 PM To: 'Tomcat Users List' Subject: RE: How to monitor
> > performance of tomcat
> >
> >> -----Original Message----- From: Randhir Singh
> >> [mailto:randhir.singh@sterlite.com] Sent: Monday, April 21, 2014
> >> 5:17 AM To: Tomcat Users List Subject: RE: How to monitor performance
> >> of tomcat
> >>
> >> Hi,
> >>
> >> I wanted input from the experts on my query below that the port
> >> 8891 does not respond when the command,
> >>
> >> jconsole 10.101.17.79:8891
> >>
> >> is issued when the application hangs and stops responding.
> >>
> >> Requesting inputs so that the root cause analysis of this issue can
> >> be found out.
> >>
> >> Regards
> >>
> > Randhir - Your actual first request in this thread was apparently a
> > request for opinions on monitoring tools. This problem of actual hangs
> > wasn't brought up until a week later. Here is what I've usually found
> > when Tomcat stops responding and even the monitoring port is
> > unreachable via jconsole and other tools: Your JVM has crashed for
> > some reason. At this point, you need to refer to the Tomcat logs, your
> > application logs, etc. in order to find the root cause. If the JVM is
> > still "running", try taking a couple of thread dumps and review them
> > to find your root cause. Jeff
> >
> > ---------------------------------------------- T ususcib, -mil
> > uer-ususcib@tmct.paheor oraditonl omans,e-ai: ses-el@tmct.paheor
> >
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>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
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Please consider environment before printing this email !
RE: How to monitor performance of tomcat
Posted by Randhir Singh <ra...@sterlite.com>.
Thanks Chris for your answer.
There is around 8 GB of free memory and not disk.
Hope, the change in the Xms, Xmx & XX:MaxPermSize helps.
Any further inputs would be appreciated.
Thanks
-----Original Message-----
From: Christopher Schultz [mailto:chris@christopherschultz.net]
Sent: Monday, May 05, 2014 9:33 PM
To: Tomcat Users List
Subject: Re: How to monitor performance of tomcat
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Randir,
On 5/5/14, 6:07 AM, Randhir Singh wrote:
> Thanks Chris for your answer.
>
> I researched a lot and want to try out an option for OOME:
>
> The JAVA_OPTS variable in $CATALINA_HOME/bin/startup.sh has the value
> as:
You should use CATALINA_OPTS. Read the comments at the top of
bin/catalina.sh to see what the difference is.
Also, you should set these environment variables in bin/setenv.sh (which you
may have to create) instead of modifying startup.sh directly. It will make
upgrades much easier.
> JAVA_OPTS="$JAVA_OPTS -Xms1303m -Xmx1303m -XX:MaxPermSize=256m
> -Dcwom.bl.ip=127.0.0.1 -Dcwom.bl.port=1399"
>
> I checked for free space on the VM instance with Red Hat Linux as the
> OS on which the Tomcat is hosted with a total memory of 19 GB, I found
> that there is around 8 GB of free space in the server.
8GiB free memory or disk?
> I am planning to increase the memory allocation for Heap size and
> PermGen size to almost double as below:
>
> JAVA_OPTS="$JAVA_OPTS -Xms2048m -Xmx2048m -XX:MaxPermSize=512m
> -Dcwom.bl.ip=127.0.0.1 -Dcwom.bl.port=1399"
>
> I hope, this should avoid the hang-up issues where Tomcat does not
> seem to respond. I plan to implement this in the UAT environment at
> first and see how it goes.
If the problem is GC-related, then the only conditions under which things
will improve by increasing memory are if you were running right under the
heap ceiling you had imposed upon yourself and GC had to run a lot in order
to keep up. Remember that GC-time is related to the number of useful
references in the heap, so if you have a large heap with lots of long-lived
objects, GC will work "harder" (to a point, with generational GC).
> There is another thing I wanted to try. We have RHEL 5.8 Beta
> (Tikanga) version and lot of updates from Red Hat are pending which
> can update the version to RHEL 5.10 (Tikanga). Would this patching
> help as lot of updates are pending?
I have no idea. I know virtually nothing about RHEL and what changes will be
coming.
- -chris
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-----END PGP SIGNATURE-----
---------------------------------------------------------------------
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--
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received this message in error, please immediately notify the sender,
preserve its confidentiality and delete it. Before opening any attachments
please check them for viruses and defects. No employee or agent is
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Technologies Limited with another party by email without express written
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Please consider environment before printing this email !
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Re: How to monitor performance of tomcat
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Randir,
On 5/5/14, 6:07 AM, Randhir Singh wrote:
> Thanks Chris for your answer.
>
> I researched a lot and want to try out an option for OOME:
>
> The JAVA_OPTS variable in $CATALINA_HOME/bin/startup.sh has the
> value as:
You should use CATALINA_OPTS. Read the comments at the top of
bin/catalina.sh to see what the difference is.
Also, you should set these environment variables in bin/setenv.sh
(which you may have to create) instead of modifying startup.sh
directly. It will make upgrades much easier.
> JAVA_OPTS="$JAVA_OPTS -Xms1303m -Xmx1303m -XX:MaxPermSize=256m
> -Dcwom.bl.ip=127.0.0.1 -Dcwom.bl.port=1399"
>
> I checked for free space on the VM instance with Red Hat Linux as
> the OS on which the Tomcat is hosted with a total memory of 19 GB,
> I found that there is around 8 GB of free space in the server.
8GiB free memory or disk?
> I am planning to increase the memory allocation for Heap size and
> PermGen size to almost double as below:
>
> JAVA_OPTS="$JAVA_OPTS -Xms2048m -Xmx2048m -XX:MaxPermSize=512m
> -Dcwom.bl.ip=127.0.0.1 -Dcwom.bl.port=1399"
>
> I hope, this should avoid the hang-up issues where Tomcat does not
> seem to respond. I plan to implement this in the UAT environment at
> first and see how it goes.
If the problem is GC-related, then the only conditions under which
things will improve by increasing memory are if you were running right
under the heap ceiling you had imposed upon yourself and GC had to run
a lot in order to keep up. Remember that GC-time is related to the
number of useful references in the heap, so if you have a large heap
with lots of long-lived objects, GC will work "harder" (to a point,
with generational GC).
> There is another thing I wanted to try. We have RHEL 5.8 Beta
> (Tikanga) version and lot of updates from Red Hat are pending which
> can update the version to RHEL 5.10 (Tikanga). Would this patching
> help as lot of updates are pending?
I have no idea. I know virtually nothing about RHEL and what changes
will be coming.
- -chris
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=tcDx
-----END PGP SIGNATURE-----
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RE: How to monitor performance of tomcat
Posted by Randhir Singh <ra...@sterlite.com>.
Thanks Chris for your answer.
I researched a lot and want to try out an option for OOME:
The JAVA_OPTS variable in $CATALINA_HOME/bin/startup.sh has the value as:
JAVA_OPTS="$JAVA_OPTS -Xms1303m -Xmx1303m -XX:MaxPermSize=256m
-Dcwom.bl.ip=127.0.0.1
-Dcwom.bl.port=1399"
I checked for free space on the VM instance with Red Hat Linux as the OS on
which the Tomcat is hosted with a total memory of 19 GB, I found that there
is around 8 GB of free space in the server.
I am planning to increase the memory allocation for Heap size and PermGen
size to almost double as below:
JAVA_OPTS="$JAVA_OPTS -Xms2048m -Xmx2048m -XX:MaxPermSize=512m
-Dcwom.bl.ip=127.0.0.1
-Dcwom.bl.port=1399"
I hope, this should avoid the hang-up issues where Tomcat does not seem to
respond. I plan to implement this in the UAT environment at first and see
how it goes.
There is another thing I wanted to try. We have RHEL 5.8 Beta (Tikanga)
version and lot of updates from Red Hat are pending which can update the
version to RHEL 5.10 (Tikanga). Would this patching help as lot of updates
are pending?
Regards
-----Original Message-----
From: Christopher Schultz [mailto:chris@christopherschultz.net]
Sent: Monday, April 28, 2014 6:46 PM
To: Tomcat Users List
Subject: Re: How to monitor performance of tomcat
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Randir,
On 4/28/14, 6:46 AM, Randhir Singh wrote:
> Thanks for your valuable inputs. I am a bit of a novice to this.
> When this problem happens, it is quite a loss of face in front of the
> users who are widely spread geographically. I checked the catalina.out
> logs on the 2 days that the problem happened on 23rd & 25th April, the
> findings are as below:
>
> 23rd April '14:
>
> The catalina.out log showed the message like,
> ----------------------------------------------------------------------
> ----------------------------------------------------------------------
> -----------
>
>
Caused by: org.jboss.remoting.InvocationFailureException: Socket timed out.
> Waited 300000 milliseconds for response while calling on
> InvokerLocator [socket://<hostname of our
> machine>:4173/?invokerDestructionDelay=5000&timeout=300000];
> nested exception is: java.net.SocketTimeoutException: Read timed out
> ----------------------------------------------------------------------
> ----------------------------------------------------------------------
> -----------
>
> 3 times among other exceptions in a span of around 2 minutes.
>
> 25th April '14:
>
> The errors captured in the logs were like,
> ----------------------------------------------------------------------
> ----------------------------------------------------------------------
> -----------
>
>
java.lang.OutOfMemoryError: GC overhead limit exceeded
> ----------------------------------------------------------------------
> ----------------------------------------------------------------------
> -----------
>
> 4 times among other exceptions in a span of around 2 minutes.
>
> Requesting a reply on this.
It sounds like you have all kinds of problems:
1. Bad performance under unspecified conditions 2. Application hang under
unspecified conditions 3. catalina.out file grows quickly, may fill
filesystem 4. Long timeouts on the server-side during some unspecified
operation (I don't know what an InvokerLocator is) 5. OOME
It seems to me that you should focus on one of these problems (probably the
OOME) and get that fixed, first. You may find it is the root of all other
problems.
This community can only help you so much with so little information.
You may have to hire someone to help you through this process.
- -chris
> -----Original Message----- From: Jeffrey Janner
> [mailto:Jeffrey.Janner@PolyDyne.com] Sent: Monday, April 21, 2014
> 7:26 PM To: 'Tomcat Users List' Subject: RE: How to monitor
> performance of tomcat
>
>> -----Original Message----- From: Randhir Singh
>> [mailto:randhir.singh@sterlite.com] Sent: Monday, April 21, 2014
>> 5:17 AM To: Tomcat Users List Subject: RE: How to monitor performance
>> of tomcat
>>
>> Hi,
>>
>> I wanted input from the experts on my query below that the port
>> 8891 does not respond when the command,
>>
>> jconsole 10.101.17.79:8891
>>
>> is issued when the application hangs and stops responding.
>>
>> Requesting inputs so that the root cause analysis of this issue can
>> be found out.
>>
>> Regards
>>
> Randhir - Your actual first request in this thread was apparently a
> request for opinions on monitoring tools. This problem of actual hangs
> wasn't brought up until a week later. Here is what I've usually found
> when Tomcat stops responding and even the monitoring port is
> unreachable via jconsole and other tools: Your JVM has crashed for
> some reason. At this point, you need to refer to the Tomcat logs, your
> application logs, etc. in order to find the root cause. If the JVM is
> still "running", try taking a couple of thread dumps and review them
> to find your root cause. Jeff
>
> ---------------------------------------------- T ususcib, -mil
> uer-ususcib@tmct.paheor oraditonl omans,e-ai: ses-el@tmct.paheor
>
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copied and used by anyone other than the intended recipient(s). If you have
received this message in error, please immediately notify the sender,
preserve its confidentiality and delete it. Before opening any attachments
please check them for viruses and defects. No employee or agent is
authorised to conclude any binding agreement on behalf of Sterlite
Technologies Limited with another party by email without express written
confirmation by authorised person. Visit us at www.sterlitetechnologies.com
Please consider environment before printing this email !
---------------------------------------------------------------------
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Re: How to monitor performance of tomcat
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Randir,
On 4/28/14, 6:46 AM, Randhir Singh wrote:
> Thanks for your valuable inputs. I am a bit of a novice to this.
> When this problem happens, it is quite a loss of face in front of
> the users who are widely spread geographically. I checked the
> catalina.out logs on the 2 days that the problem happened on 23rd &
> 25th April, the findings are as below:
>
> 23rd April '14:
>
> The catalina.out log showed the message like,
> -------------------------------------------------------------------------------------------------------------------------------------------------------
>
>
Caused by: org.jboss.remoting.InvocationFailureException: Socket timed out.
> Waited 300000 milliseconds for response while calling on
> InvokerLocator [socket://<hostname of our
> machine>:4173/?invokerDestructionDelay=5000&timeout=300000];
> nested exception is: java.net.SocketTimeoutException: Read timed
> out
> -------------------------------------------------------------------------------------------------------------------------------------------------------
>
> 3 times among other exceptions in a span of around 2 minutes.
>
> 25th April '14:
>
> The errors captured in the logs were like,
> -------------------------------------------------------------------------------------------------------------------------------------------------------
>
>
java.lang.OutOfMemoryError: GC overhead limit exceeded
> -------------------------------------------------------------------------------------------------------------------------------------------------------
>
> 4 times among other exceptions in a span of around 2 minutes.
>
> Requesting a reply on this.
It sounds like you have all kinds of problems:
1. Bad performance under unspecified conditions
2. Application hang under unspecified conditions
3. catalina.out file grows quickly, may fill filesystem
4. Long timeouts on the server-side during some unspecified operation
(I don't know what an InvokerLocator is)
5. OOME
It seems to me that you should focus on one of these problems
(probably the OOME) and get that fixed, first. You may find it is the
root of all other problems.
This community can only help you so much with so little information.
You may have to hire someone to help you through this process.
- -chris
> -----Original Message----- From: Jeffrey Janner
> [mailto:Jeffrey.Janner@PolyDyne.com] Sent: Monday, April 21, 2014
> 7:26 PM To: 'Tomcat Users List' Subject: RE: How to monitor
> performance of tomcat
>
>> -----Original Message----- From: Randhir Singh
>> [mailto:randhir.singh@sterlite.com] Sent: Monday, April 21, 2014
>> 5:17 AM To: Tomcat Users List Subject: RE: How to monitor
>> performance of tomcat
>>
>> Hi,
>>
>> I wanted input from the experts on my query below that the port
>> 8891 does not respond when the command,
>>
>> jconsole 10.101.17.79:8891
>>
>> is issued when the application hangs and stops responding.
>>
>> Requesting inputs so that the root cause analysis of this issue
>> can be found out.
>>
>> Regards
>>
> Randhir - Your actual first request in this thread was apparently a
> request for opinions on monitoring tools. This problem of actual
> hangs wasn't brought up until a week later. Here is what I've
> usually found when Tomcat stops responding and even the monitoring
> port is unreachable via jconsole and other tools: Your JVM has
> crashed for some reason. At this point, you need to refer to the
> Tomcat logs, your application logs, etc. in order to find the root
> cause. If the JVM is still "running", try taking a couple of
> thread dumps and review them to find your root cause. Jeff
>
> ---------------------------------------------- T ususcib, -mil
> uer-ususcib@tmct.paheor oraditonl omans,e-ai: ses-el@tmct.paheor
>
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Re: How to monitor performance of tomcat
Posted by André Warnier <aw...@ice-sa.com>.
Randhir Singh wrote:
> Hi,
>
> I had another point to add in this other than the reply sent by me in the
> earlier mail is that if the JVM crashes as pointed out by you, would a JVM
> process get started when Tomcat is started.
>
> Also, how to check if 2 processes are sharing a common JVM. The 2 processes
> referred to with the context of our environment would be JBoss & Tomcat.
>
> I hope my query is clear.
>
Your question may be relatively clear, but maybe your premises are not clear.
From the system/OS perspective, the process which is running is the JVM (or multiple JVM
processes; look for "java" on the first part of the command-line).
Then, this JVM may be running several (java bytecode) java applications. But these are
not processes from the OS perspective. They are just "things" that the JVM is doing.
So, when you "start Tomcat", you are not really "starting a Tomcat process". What you are
starting is a JVM process, and you tell it (by its arguments), to start reading some
compiled "classes" and executing their code.
What everyone has been trying to get out of you, so far without success, is how many java
processes you are really starting, and what you are telling each of them to run in terms
of java applications.
And (I am not an expert, so I am not commenting on that part), what most people here seem
to be saying is that Jboss uses some embedded Tomcat code as its servlet engine, so it
should all run within the same JVM (and thus the same process), and thus they do not
really understand what you seem to be talking about.
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Re: How to monitor performance of tomcat
Posted by Randhir Singh <ra...@sterlite.com>.
Hi,
I had another point to add in this other than the reply sent by me in the
earlier mail is that if the JVM crashes as pointed out by you, would a JVM
process get started when Tomcat is started.
Also, how to check if 2 processes are sharing a common JVM. The 2 processes
referred to with the context of our environment would be JBoss & Tomcat.
I hope my query is clear.
Requesting a reply.
On Mon, Apr 28, 2014 at 4:16 PM, Randhir Singh
<ra...@sterlite.com>wrote:
> Thanks for your valuable inputs. I am a bit of a novice to this. When this
> problem happens, it is quite a loss of face in front of the users who are
> widely spread geographically. I checked the catalina.out logs on the 2 days
> that the problem happened on 23rd & 25th April, the findings are as below:
>
> 23rd April '14:
>
> The catalina.out log showed the message like,
>
> -------------------------------------------------------------------------------------------------------------------------------------------------------
> Caused by: org.jboss.remoting.InvocationFailureException: Socket timed out.
> Waited 300000 milliseconds for response while calling on InvokerLocator
> [socket://<hostname of our
> machine>:4173/?invokerDestructionDelay=5000&timeout=300000]; nested
> exception is:
> java.net.SocketTimeoutException: Read timed out
>
> -------------------------------------------------------------------------------------------------------------------------------------------------------
>
> 3 times among other exceptions in a span of around 2 minutes.
>
> 25th April '14:
>
> The errors captured in the logs were like,
>
> -------------------------------------------------------------------------------------------------------------------------------------------------------
> java.lang.OutOfMemoryError: GC overhead limit exceeded
>
> -------------------------------------------------------------------------------------------------------------------------------------------------------
>
> 4 times among other exceptions in a span of around 2 minutes.
>
> Requesting a reply on this.
>
> Regards
>
> -----Original Message-----
> From: Jeffrey Janner [mailto:Jeffrey.Janner@PolyDyne.com]
> Sent: Monday, April 21, 2014 7:26 PM
> To: 'Tomcat Users List'
> Subject: RE: How to monitor performance of tomcat
>
> > -----Original Message-----
> > From: Randhir Singh [mailto:randhir.singh@sterlite.com]
> > Sent: Monday, April 21, 2014 5:17 AM
> > To: Tomcat Users List
> > Subject: RE: How to monitor performance of tomcat
> >
> > Hi,
> >
> > I wanted input from the experts on my query below that the port 8891
> > does not respond when the command,
> >
> > jconsole 10.101.17.79:8891
> >
> > is issued when the application hangs and stops responding.
> >
> > Requesting inputs so that the root cause analysis of this issue can be
> > found out.
> >
> > Regards
> >
> Randhir -
> Your actual first request in this thread was apparently a request for
> opinions on monitoring tools.
> This problem of actual hangs wasn't brought up until a week later.
> Here is what I've usually found when Tomcat stops responding and even the
> monitoring port is unreachable via jconsole and other tools: Your JVM has
> crashed for some reason.
> At this point, you need to refer to the Tomcat logs, your application logs,
> etc. in order to find the root cause. If the JVM is still "running", try
> taking a couple of thread dumps and review them to find your root cause.
> Jeff
>
> ----------------------------------------------
> T ususcib, -mil uer-ususcib@tmct.paheor
> oraditonl omans,e-ai: ses-el@tmct.paheor
>
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Re: How to monitor performance of tomcat
Posted by André Warnier <aw...@ice-sa.com>.
Randhir Singh wrote:
> Hi,
>
> I increased the Heap & PermGen memory as per trail mail but the performance
> seemed to deteriorate. On the day I increased the memory in the morning,
> the system hung 3 times in the day whereas the maximum times it has got
> hang before is 2 times in a day. I changed the memory settings for Heap &
> PermGen back to before when it hung again the next day, I reverted to the
> old memory values.
>
> The catalina.out showed the entries like below when I monitored it twice
> after the system hung with the new memory values:
>
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> [ 22-May-2014 03:15:40 ] [ TRACE ] [http-30080-56] [ CHECK SESSION ] :
> Inside doInit Method
> May 22, 2014 3:16:14 PM org.zkoss.zk.ui.impl.UiEngineImpl handleError:1351
> SEVERE: >>org.zkoss.zk.ui.UiException:
> org.jboss.remoting.InvocationFailureException: Socket timed out. Waited
> 300000 milliseconds for response while calling on InvokerLocator [socket://
> bssossapp01.snl.com:4173/?invokerDestructionDelay=5000&timeout=300000];
> nested exception is:
> java.net.SocketTimeoutException: Read timed out
>>> org.jboss.remoting.InvocationFailureException: Socket timed out. Waited
> 300000 milliseconds for response while calling on InvokerLocator [socket://
> bssossapp01.snl.com:4173/?invokerDestructionDelay=5000&timeout=300000];
> nested exception is:
> java.net.SocketTimeoutException: Read timed out
>>> java.net.SocketTimeoutException: Read timed out
>>> at java.net.SocketInputStream.socketRead0(Native Method)
>
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> I would be eager to respond in case of any clarification.
>
> Requesting a reply to resolve this as the attempt to resolve this by
> increasing Heap & PermGen memory has failed. I have worked on this issue a
> lot and have been trying to interact with the experts on the forum.
>
> Regards
>
Hi.
I am jumping in here in the middle, and have not followed the previous correspondence.
(Which is hard anyway, considering that you keep on top-posting).
(And I do not know Jboss at all, so maybe I am misinterpreting all of this).
But if I go by what you are mentioning above - and despite the apparent subject - it looks
to me as follows :
- the application (not part of any Tomcat code per se) is trying to connect to, and read
from, some (for Tomcat) external server
- and that external service is not responding, within the timeout set for this connection
(300,000 ms = 5 minutes)
- thus you see the above exceptions happening
So it is a bit hard from there, to figure out what the Tomcat Heap and Permgen sizes (or
Tomcat performance for that matter) have to do with this.
Intuitively, I would tend to think that if you give more memory to Tomcat to play with,
then maybe it tries to handle more simultaneous requests that cause more of these external
connections to be opened, all of them ultimately failing because the external server does
not respond.
Should you not look at what causes the external server to be slow to respond, first of all ?
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Re: How to monitor performance of tomcat
Posted by Randhir Singh <ra...@sterlite.com>.
Hi,
I increased the Heap & PermGen memory as per trail mail but the performance
seemed to deteriorate. On the day I increased the memory in the morning,
the system hung 3 times in the day whereas the maximum times it has got
hang before is 2 times in a day. I changed the memory settings for Heap &
PermGen back to before when it hung again the next day, I reverted to the
old memory values.
The catalina.out showed the entries like below when I monitored it twice
after the system hung with the new memory values:
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
[ 22-May-2014 03:15:40 ] [ TRACE ] [http-30080-56] [ CHECK SESSION ] :
Inside doInit Method
May 22, 2014 3:16:14 PM org.zkoss.zk.ui.impl.UiEngineImpl handleError:1351
SEVERE: >>org.zkoss.zk.ui.UiException:
org.jboss.remoting.InvocationFailureException: Socket timed out. Waited
300000 milliseconds for response while calling on InvokerLocator [socket://
bssossapp01.snl.com:4173/?invokerDestructionDelay=5000&timeout=300000];
nested exception is:
java.net.SocketTimeoutException: Read timed out
>>org.jboss.remoting.InvocationFailureException: Socket timed out. Waited
300000 milliseconds for response while calling on InvokerLocator [socket://
bssossapp01.snl.com:4173/?invokerDestructionDelay=5000&timeout=300000];
nested exception is:
java.net.SocketTimeoutException: Read timed out
>>java.net.SocketTimeoutException: Read timed out
>> at java.net.SocketInputStream.socketRead0(Native Method)
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
I would be eager to respond in case of any clarification.
Requesting a reply to resolve this as the attempt to resolve this by
increasing Heap & PermGen memory has failed. I have worked on this issue a
lot and have been trying to interact with the experts on the forum.
Regards
On Wed, May 21, 2014 at 6:01 PM, Randhir Singh
<ra...@sterlite.com>wrote:
> Hi,
>
> There is a correction as JAVA_OPTS variable is defined in catalina.sh
> under $CATALINA_HOME/bin and we use $CATALINA_HOME/bin/startup.sh to start
> tomcat. $CATALINA_HOME/bin/startup.sh has the code like below ,
>
>
> ----------------------------------------------------------------------------------------------------------------------------------------------
> PRGDIR=`dirname "$PRG"`
> EXECUTABLE=catalina.sh
>
> # Check that target executable exists
> if $os400; then
> # -x will Only work on the os400 if the files are:
> # 1. owned by the user
> # 2. owned by the PRIMARY group of the user
> # this will not work if the user belongs in secondary groups
> eval
> else
> if [ ! -x "$PRGDIR"/"$EXECUTABLE" ]; then
> echo "Cannot find $PRGDIR/$EXECUTABLE"
> echo "The file is absent or does not have execute permission"
> echo "This file is needed to run this program"
> exit 1
> fi
> fi
>
> ----------------------------------------------------------------------------------------------------------------------------------------------
>
> I had changed catalina.sh in our development environment like a week back
> and want to implement it in the production environment but I got this
> doubt. I feel catalina.sh is invoked by startup.sh but am not sure. I have
> already taken downtime for production tomorrow but I got this doubt whether
> changing the
>
> JAVA_OPTS="$JAVA_OPTS -Xms1303m -Xmx1303m -XX:MaxPermSize=256m
> -Dcwom.bl.ip=127.0.0.1 -Dcwom.bl.port=1399" to
>
> JAVA_OPTS="$JAVA_OPTS -Xms2048m -Xmx2048m
> -XX:MaxPermSize=512m -Dcwom.bl.ip=127.0.0.1 -Dcwom.bl.port=1399"
>
> in catalina.sh would have the affect of increasing the heap & Permgen
> memory in Tomcat.
>
> I hope my query is clear as am quite anxious as I have a downtime
> scheduled tomorrow.
>
> Requesting a reply on priority.
>
>
> <ra...@sterlite.com> wrote:
>
>> Thanks a lot for your detailed reply.
>>
>> The JAVA_OPTS variable in $CATALINA_HOME/bin/startup.sh has the value as:
>>
>> JAVA_OPTS="$JAVA_OPTS -Xms1303m -Xmx1303m -XX:MaxPermSize=256m
>> -Dcwom.bl.ip=127.0.0.1
>> -Dcwom.bl.port=1399"
>>
>> I checked for free space on the VM instance with Red Hat Linux as the OS
>> on
>> which the Tomcat is hosted with a total memory of 19 GB, I found that
>> there
>> is around 8 GB of free space in the server.
>>
>> As per your inputs, I am planning to increase the memory allocation for
>> Heap
>> size and PermGen size to almost double as below:
>>
>> JAVA_OPTS="$JAVA_OPTS -Xms2048m -Xmx2048m -XX:MaxPermSize=512m
>> -Dcwom.bl.ip=127.0.0.1
>> -Dcwom.bl.port=1399"
>>
>> I hope, this should avoid the hang-up issues where Tomcat does not seem to
>> respond.
>>
>> I plan to implement this in the UAT environment at first and see how it
>> goes.
>>
>> Regards
>>
>> -----Original Message-----
>> From: Jeffrey Janner [mailto:Jeffrey.Janner@PolyDyne.com]
>> Sent: Monday, April 28, 2014 7:39 PM
>> To: 'Randhir Singh'
>> Subject: RE: How to monitor performance of tomcat
>>
>> > -----Original Message-----
>> > From: Randhir Singh [mailto:randhir.singh@sterlite.com]
>> > Sent: Monday, April 28, 2014 5:47 AM
>> > To: Jeffrey Janner; Tomcat Users List
>> > Subject: RE: How to monitor performance of tomcat
>> >
>> > Thanks for your valuable inputs. I am a bit of a novice to this. When
>> > this problem happens, it is quite a loss of face in front of the users
>> > who are widely spread geographically. I checked the catalina.out logs
>> > on the 2 days that the problem happened on 23rd & 25th April, the
>> > findings are as below:
>> >
>> > 23rd April '14:
>> >
>> > The catalina.out log showed the message like,
>> > ----------------------------------------------------------------------
>> > -
>> > ----------------------------------------------------------------------
>> > -
>> > ---------
>> > Caused by: org.jboss.remoting.InvocationFailureException: Socket timed
>> > out.
>> > Waited 300000 milliseconds for response while calling on
>> > InvokerLocator [socket://<hostname of our
>> > machine>:4173/?invokerDestructionDelay=5000&timeout=300000]; nested
>> > exception is:
>> > java.net.SocketTimeoutException: Read timed out
>> > ----------------------------------------------------------------------
>> > -
>> > ----------------------------------------------------------------------
>> > -
>> > ---------
>> >
>> > 3 times among other exceptions in a span of around 2 minutes.
>> >
>> > 25th April '14:
>> >
>> > The errors captured in the logs were like,
>> > ----------------------------------------------------------------------
>> > -
>> > ----------------------------------------------------------------------
>> > -
>> > ---------
>> > java.lang.OutOfMemoryError: GC overhead limit exceeded
>>
>> This error specifically means that the JVM is basically spending all of
>> its
>> time doing garbage collection and not really getting any significant
>> amount
>> of memory back for its efforts. The end user experiences this usually as
>> a
>> hung system. It might eventually come back or it might end up with a
>> different, more severe, OOM error.
>> There are lots of various causes for this: too small memory allocation;
>> too
>> much load; an activity generating a lot of objects, most of which persist
>> for a long time; memory leaks; or a combination of the above.
>> How to address it?
>> a) Profile what parts of the app are being used with this occurs and have
>> the dev team look at what could be causing the problem. There might be a
>> better way to perform the action requested.
>> b) Increase the available memory (double it or more). This is only a
>> band-aid and you may still have the problem, but less often. Have the dev
>> team look for memory leaks.
>> c) Anyone else with ideas?
>> Jeff
>>
>> > ----------------------------------------------------------------------
>> > -
>> > ----------------------------------------------------------------------
>> > -
>> > ---------
>> >
>> > 4 times among other exceptions in a span of around 2 minutes.
>> >
>> > Requesting a reply on this.
>> >
>> > Regards
>>
>> __________________________________________________________________________
>> Confidentiality Notice: This Transmission (including any attachments) may
>> contain information that is privileged, confidential, and exempt from
>> disclosure under applicable law. If the reader of this message is not the
>> intended recipient you are hereby notified that any dissemination,
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>>
>> If you have received this transmission in error, please immediately reply
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>
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Re: How to monitor performance of tomcat
Posted by Randhir Singh <ra...@sterlite.com>.
Thanks Ognjen for your reply. My reply was intended to 2 different people
hence it repeated but anyway I would try to take care on this.
So now it is clear from your answer that catalina.sh is called from
startup.sh in a default installation.
Regards
On Thu, May 22, 2014 at 3:59 AM, Ognjen Blagojevic <
ognjen.d.blagojevic@gmail.com> wrote:
> Randhir,
>
> On 21.5.2014 14:31, Randhir Singh wrote:
>
>> I had changed catalina.sh in our development environment like a week back
>> and want to implement it in the production environment but I got this
>> doubt. I feel catalina.sh is invoked by startup.sh but am not sure. I have
>> already taken downtime for production tomorrow but I got this doubt
>> whether
>> changing the
>>
>
> 1. Don't post the same message twice. It makes volunteers on the list
> waste their time.
>
> 2. Don't top post. Bottom posting is the standard on this list.
>
> 3. Don't "request"/ People are volunteering here.
>
> 4. In default Tomcat instalation, catalina.sh is called from startup.sh.
>
> 5. Regardless of do you call startup.sh or catalina.sh, environment
> variables have the same meaning: JAVA_OPTS is used on Tomcat startup and
> Tomcat shutdown, while CATALINA_OPTS is only used on Tomcat startup. If you
> place -Xms2048m in JAVA_OPTS it will reserve 2 GB on Tomcat startup, and
> another 2 GB when you invoke Tomcat shutdown. That is waste of memory. Use
> CATALINA_OPTS instead.
>
> 6. It is not recommended to modify startup.sh or catalina.sh ever. All
> environment variables should be set in the file bin/setenv.sh.
>
> 7. (5.) and (6.) were already pointed out by Chris. Please read answers on
> the list carefully to show that you respect resources volunteers are
> allocating for you for free.
>
> 8. You may invoke "ps -fHA | grep Bootstrap" after you start Tomcat, to
> see if your CATALINA_OPTS reached JVM call.
>
> -Ognjen
>
>
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>
>
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Re: How to monitor performance of tomcat
Posted by Ognjen Blagojevic <og...@gmail.com>.
Randhir,
On 21.5.2014 14:31, Randhir Singh wrote:
> I had changed catalina.sh in our development environment like a week back
> and want to implement it in the production environment but I got this
> doubt. I feel catalina.sh is invoked by startup.sh but am not sure. I have
> already taken downtime for production tomorrow but I got this doubt whether
> changing the
1. Don't post the same message twice. It makes volunteers on the list
waste their time.
2. Don't top post. Bottom posting is the standard on this list.
3. Don't "request"/ People are volunteering here.
4. In default Tomcat instalation, catalina.sh is called from startup.sh.
5. Regardless of do you call startup.sh or catalina.sh, environment
variables have the same meaning: JAVA_OPTS is used on Tomcat startup and
Tomcat shutdown, while CATALINA_OPTS is only used on Tomcat startup. If
you place -Xms2048m in JAVA_OPTS it will reserve 2 GB on Tomcat startup,
and another 2 GB when you invoke Tomcat shutdown. That is waste of
memory. Use CATALINA_OPTS instead.
6. It is not recommended to modify startup.sh or catalina.sh ever. All
environment variables should be set in the file bin/setenv.sh.
7. (5.) and (6.) were already pointed out by Chris. Please read answers
on the list carefully to show that you respect resources volunteers are
allocating for you for free.
8. You may invoke "ps -fHA | grep Bootstrap" after you start Tomcat, to
see if your CATALINA_OPTS reached JVM call.
-Ognjen
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Re: How to monitor performance of tomcat
Posted by Randhir Singh <ra...@sterlite.com>.
Hi,
There is a correction as JAVA_OPTS variable is defined in catalina.sh under
$CATALINA_HOME/bin and we use $CATALINA_HOME/bin/startup.sh to start
tomcat. $CATALINA_HOME/bin/startup.sh has the code like below ,
----------------------------------------------------------------------------------------------------------------------------------------------
PRGDIR=`dirname "$PRG"`
EXECUTABLE=catalina.sh
# Check that target executable exists
if $os400; then
# -x will Only work on the os400 if the files are:
# 1. owned by the user
# 2. owned by the PRIMARY group of the user
# this will not work if the user belongs in secondary groups
eval
else
if [ ! -x "$PRGDIR"/"$EXECUTABLE" ]; then
echo "Cannot find $PRGDIR/$EXECUTABLE"
echo "The file is absent or does not have execute permission"
echo "This file is needed to run this program"
exit 1
fi
fi
----------------------------------------------------------------------------------------------------------------------------------------------
I had changed catalina.sh in our development environment like a week back
and want to implement it in the production environment but I got this
doubt. I feel catalina.sh is invoked by startup.sh but am not sure. I have
already taken downtime for production tomorrow but I got this doubt whether
changing the
JAVA_OPTS="$JAVA_OPTS -Xms1303m -Xmx1303m -XX:MaxPermSize=256m
-Dcwom.bl.ip=127.0.0.1 -Dcwom.bl.port=1399" to
JAVA_OPTS="$JAVA_OPTS -Xms2048m -Xmx2048m
-XX:MaxPermSize=512m -Dcwom.bl.ip=127.0.0.1 -Dcwom.bl.port=1399"
in catalina.sh would have the affect of increasing the heap & Permgen
memory in Tomcat.
I hope my query is clear as am quite anxious as I have a downtime scheduled
tomorrow.
Requesting a reply on priority.
<ra...@sterlite.com> wrote:
> Thanks a lot for your detailed reply.
>
> The JAVA_OPTS variable in $CATALINA_HOME/bin/startup.sh has the value as:
>
> JAVA_OPTS="$JAVA_OPTS -Xms1303m -Xmx1303m -XX:MaxPermSize=256m
> -Dcwom.bl.ip=127.0.0.1
> -Dcwom.bl.port=1399"
>
> I checked for free space on the VM instance with Red Hat Linux as the OS on
> which the Tomcat is hosted with a total memory of 19 GB, I found that there
> is around 8 GB of free space in the server.
>
> As per your inputs, I am planning to increase the memory allocation for
> Heap
> size and PermGen size to almost double as below:
>
> JAVA_OPTS="$JAVA_OPTS -Xms2048m -Xmx2048m -XX:MaxPermSize=512m
> -Dcwom.bl.ip=127.0.0.1
> -Dcwom.bl.port=1399"
>
> I hope, this should avoid the hang-up issues where Tomcat does not seem to
> respond.
>
> I plan to implement this in the UAT environment at first and see how it
> goes.
>
> Regards
>
> -----Original Message-----
> From: Jeffrey Janner [mailto:Jeffrey.Janner@PolyDyne.com]
> Sent: Monday, April 28, 2014 7:39 PM
> To: 'Randhir Singh'
> Subject: RE: How to monitor performance of tomcat
>
> > -----Original Message-----
> > From: Randhir Singh [mailto:randhir.singh@sterlite.com]
> > Sent: Monday, April 28, 2014 5:47 AM
> > To: Jeffrey Janner; Tomcat Users List
> > Subject: RE: How to monitor performance of tomcat
> >
> > Thanks for your valuable inputs. I am a bit of a novice to this. When
> > this problem happens, it is quite a loss of face in front of the users
> > who are widely spread geographically. I checked the catalina.out logs
> > on the 2 days that the problem happened on 23rd & 25th April, the
> > findings are as below:
> >
> > 23rd April '14:
> >
> > The catalina.out log showed the message like,
> > ----------------------------------------------------------------------
> > -
> > ----------------------------------------------------------------------
> > -
> > ---------
> > Caused by: org.jboss.remoting.InvocationFailureException: Socket timed
> > out.
> > Waited 300000 milliseconds for response while calling on
> > InvokerLocator [socket://<hostname of our
> > machine>:4173/?invokerDestructionDelay=5000&timeout=300000]; nested
> > exception is:
> > java.net.SocketTimeoutException: Read timed out
> > ----------------------------------------------------------------------
> > -
> > ----------------------------------------------------------------------
> > -
> > ---------
> >
> > 3 times among other exceptions in a span of around 2 minutes.
> >
> > 25th April '14:
> >
> > The errors captured in the logs were like,
> > ----------------------------------------------------------------------
> > -
> > ----------------------------------------------------------------------
> > -
> > ---------
> > java.lang.OutOfMemoryError: GC overhead limit exceeded
>
> This error specifically means that the JVM is basically spending all of its
> time doing garbage collection and not really getting any significant amount
> of memory back for its efforts. The end user experiences this usually as a
> hung system. It might eventually come back or it might end up with a
> different, more severe, OOM error.
> There are lots of various causes for this: too small memory allocation; too
> much load; an activity generating a lot of objects, most of which persist
> for a long time; memory leaks; or a combination of the above.
> How to address it?
> a) Profile what parts of the app are being used with this occurs and have
> the dev team look at what could be causing the problem. There might be a
> better way to perform the action requested.
> b) Increase the available memory (double it or more). This is only a
> band-aid and you may still have the problem, but less often. Have the dev
> team look for memory leaks.
> c) Anyone else with ideas?
> Jeff
>
> > ----------------------------------------------------------------------
> > -
> > ----------------------------------------------------------------------
> > -
> > ---------
> >
> > 4 times among other exceptions in a span of around 2 minutes.
> >
> > Requesting a reply on this.
> >
> > Regards
>
> __________________________________________________________________________
> Confidentiality Notice: This Transmission (including any attachments) may
> contain information that is privileged, confidential, and exempt from
> disclosure under applicable law. If the reader of this message is not the
> intended recipient you are hereby notified that any dissemination,
> distribution, or copying of this communication is strictly prohibited.
>
> If you have received this transmission in error, please immediately reply
> to
> the sender or telephone (512) 343-9100 and delete this transmission from
> your system.
>
--
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RE: How to monitor performance of tomcat
Posted by Randhir Singh <ra...@sterlite.com>.
Thanks a lot for your detailed reply.
The JAVA_OPTS variable in $CATALINA_HOME/bin/startup.sh has the value as:
JAVA_OPTS="$JAVA_OPTS -Xms1303m -Xmx1303m -XX:MaxPermSize=256m
-Dcwom.bl.ip=127.0.0.1
-Dcwom.bl.port=1399"
I checked for free space on the VM instance with Red Hat Linux as the OS on
which the Tomcat is hosted with a total memory of 19 GB, I found that there
is around 8 GB of free space in the server.
As per your inputs, I am planning to increase the memory allocation for Heap
size and PermGen size to almost double as below:
JAVA_OPTS="$JAVA_OPTS -Xms2048m -Xmx2048m -XX:MaxPermSize=512m
-Dcwom.bl.ip=127.0.0.1
-Dcwom.bl.port=1399"
I hope, this should avoid the hang-up issues where Tomcat does not seem to
respond.
I plan to implement this in the UAT environment at first and see how it
goes.
Regards
-----Original Message-----
From: Jeffrey Janner [mailto:Jeffrey.Janner@PolyDyne.com]
Sent: Monday, April 28, 2014 7:39 PM
To: 'Randhir Singh'
Subject: RE: How to monitor performance of tomcat
> -----Original Message-----
> From: Randhir Singh [mailto:randhir.singh@sterlite.com]
> Sent: Monday, April 28, 2014 5:47 AM
> To: Jeffrey Janner; Tomcat Users List
> Subject: RE: How to monitor performance of tomcat
>
> Thanks for your valuable inputs. I am a bit of a novice to this. When
> this problem happens, it is quite a loss of face in front of the users
> who are widely spread geographically. I checked the catalina.out logs
> on the 2 days that the problem happened on 23rd & 25th April, the
> findings are as below:
>
> 23rd April '14:
>
> The catalina.out log showed the message like,
> ----------------------------------------------------------------------
> -
> ----------------------------------------------------------------------
> -
> ---------
> Caused by: org.jboss.remoting.InvocationFailureException: Socket timed
> out.
> Waited 300000 milliseconds for response while calling on
> InvokerLocator [socket://<hostname of our
> machine>:4173/?invokerDestructionDelay=5000&timeout=300000]; nested
> exception is:
> java.net.SocketTimeoutException: Read timed out
> ----------------------------------------------------------------------
> -
> ----------------------------------------------------------------------
> -
> ---------
>
> 3 times among other exceptions in a span of around 2 minutes.
>
> 25th April '14:
>
> The errors captured in the logs were like,
> ----------------------------------------------------------------------
> -
> ----------------------------------------------------------------------
> -
> ---------
> java.lang.OutOfMemoryError: GC overhead limit exceeded
This error specifically means that the JVM is basically spending all of its
time doing garbage collection and not really getting any significant amount
of memory back for its efforts. The end user experiences this usually as a
hung system. It might eventually come back or it might end up with a
different, more severe, OOM error.
There are lots of various causes for this: too small memory allocation; too
much load; an activity generating a lot of objects, most of which persist
for a long time; memory leaks; or a combination of the above.
How to address it?
a) Profile what parts of the app are being used with this occurs and have
the dev team look at what could be causing the problem. There might be a
better way to perform the action requested.
b) Increase the available memory (double it or more). This is only a
band-aid and you may still have the problem, but less often. Have the dev
team look for memory leaks.
c) Anyone else with ideas?
Jeff
> ----------------------------------------------------------------------
> -
> ----------------------------------------------------------------------
> -
> ---------
>
> 4 times among other exceptions in a span of around 2 minutes.
>
> Requesting a reply on this.
>
> Regards
__________________________________________________________________________
Confidentiality Notice: This Transmission (including any attachments) may
contain information that is privileged, confidential, and exempt from
disclosure under applicable law. If the reader of this message is not the
intended recipient you are hereby notified that any dissemination,
distribution, or copying of this communication is strictly prohibited.
If you have received this transmission in error, please immediately reply to
the sender or telephone (512) 343-9100 and delete this transmission from
your system.
--
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The content of this message may be legally privileged and confidential and
are for the use of the intended recipient(s) only. It should not be read,
copied and used by anyone other than the intended recipient(s). If you have
received this message in error, please immediately notify the sender,
preserve its confidentiality and delete it. Before opening any attachments
please check them for viruses and defects. No employee or agent is
authorised to conclude any binding agreement on behalf of Sterlite
Technologies Limited with another party by email without express written
confirmation by authorised person. Visit us at www.sterlitetechnologies.com
Please consider environment before printing this email !
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RE: How to monitor performance of tomcat
Posted by Randhir Singh <ra...@sterlite.com>.
Thanks for your valuable inputs. I am a bit of a novice to this. When this
problem happens, it is quite a loss of face in front of the users who are
widely spread geographically. I checked the catalina.out logs on the 2 days
that the problem happened on 23rd & 25th April, the findings are as below:
23rd April '14:
The catalina.out log showed the message like,
-------------------------------------------------------------------------------------------------------------------------------------------------------
Caused by: org.jboss.remoting.InvocationFailureException: Socket timed out.
Waited 300000 milliseconds for response while calling on InvokerLocator
[socket://<hostname of our
machine>:4173/?invokerDestructionDelay=5000&timeout=300000]; nested
exception is:
java.net.SocketTimeoutException: Read timed out
-------------------------------------------------------------------------------------------------------------------------------------------------------
3 times among other exceptions in a span of around 2 minutes.
25th April '14:
The errors captured in the logs were like,
-------------------------------------------------------------------------------------------------------------------------------------------------------
java.lang.OutOfMemoryError: GC overhead limit exceeded
-------------------------------------------------------------------------------------------------------------------------------------------------------
4 times among other exceptions in a span of around 2 minutes.
Requesting a reply on this.
Regards
-----Original Message-----
From: Jeffrey Janner [mailto:Jeffrey.Janner@PolyDyne.com]
Sent: Monday, April 21, 2014 7:26 PM
To: 'Tomcat Users List'
Subject: RE: How to monitor performance of tomcat
> -----Original Message-----
> From: Randhir Singh [mailto:randhir.singh@sterlite.com]
> Sent: Monday, April 21, 2014 5:17 AM
> To: Tomcat Users List
> Subject: RE: How to monitor performance of tomcat
>
> Hi,
>
> I wanted input from the experts on my query below that the port 8891
> does not respond when the command,
>
> jconsole 10.101.17.79:8891
>
> is issued when the application hangs and stops responding.
>
> Requesting inputs so that the root cause analysis of this issue can be
> found out.
>
> Regards
>
Randhir -
Your actual first request in this thread was apparently a request for
opinions on monitoring tools.
This problem of actual hangs wasn't brought up until a week later.
Here is what I've usually found when Tomcat stops responding and even the
monitoring port is unreachable via jconsole and other tools: Your JVM has
crashed for some reason.
At this point, you need to refer to the Tomcat logs, your application logs,
etc. in order to find the root cause. If the JVM is still "running", try
taking a couple of thread dumps and review them to find your root cause.
Jeff
----------------------------------------------
T ususcib, -mil uer-ususcib@tmct.paheor
oraditonl omans,e-ai: ses-el@tmct.paheor
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please check them for viruses and defects. No employee or agent is
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RE: How to monitor performance of tomcat
Posted by Jeffrey Janner <Je...@PolyDyne.com>.
> -----Original Message-----
> From: Randhir Singh [mailto:randhir.singh@sterlite.com]
> Sent: Monday, April 21, 2014 5:17 AM
> To: Tomcat Users List
> Subject: RE: How to monitor performance of tomcat
>
> Hi,
>
> I wanted input from the experts on my query below that the port 8891
> does not respond when the command,
>
> jconsole 10.101.17.79:8891
>
> is issued when the application hangs and stops responding.
>
> Requesting inputs so that the root cause analysis of this issue can be
> found out.
>
> Regards
>
Randhir -
Your actual first request in this thread was apparently a request for opinions on monitoring tools.
This problem of actual hangs wasn't brought up until a week later.
Here is what I've usually found when Tomcat stops responding and even the monitoring port is unreachable via jconsole and other tools: Your JVM has crashed for some reason.
At this point, you need to refer to the Tomcat logs, your application logs, etc. in order to find the root cause. If the JVM is still "running", try taking a couple of thread dumps and review them to find your root cause.
Jeff
Re: How to monitor performance of tomcat
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Randhir,
No need to reply to me directly: I get all messages posted to the list.
There is also no need to post multiple threads on the same topic.
Stick to one thread and you'll get better replies.
I'll answer this one here, but let's stick to one of the other ones
you have posted under a better subject line.
I won't reply to this thread after this message unless you want to
pick-up your original discussion about monitoring your Tomcat and JVM.
On 4/22/14, 10:52 AM, Randhir Singh wrote:
> Thanks for your answer. The disk space is an issue as it is 99%
> right now. The mountpoint /opt is 40G and catalina.out is occupying
> 13G.
What is logging so much to that file?
> We have log rotated files being made like catalina.2014-04-16.log,
> host-manager.2014-04-14.log, localhost.2014-04-14.log.
Good. These seem to be properly configured to rotate, then.
> I can reply to you immediately if you could specify what details
> you need about the logging configuration, the text from the files
> you require.
If you just need to rotate catalina.out, then you'll have to use
something like chronolog. logrotate isn't great for this kind of thing.
- -chris
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RE: How to monitor performance of tomcat
Posted by Randhir Singh <ra...@sterlite.com>.
Thanks for your answer. The disk space is an issue as it is 99% right now.
The mountpoint /opt is 40G and catalina.out is occupying 13G.
We have log rotated files being made like catalina.2014-04-16.log,
host-manager.2014-04-14.log, localhost.2014-04-14.log.
I can reply to you immediately if you could specify what details you need
about the logging configuration, the text from the files you require.
Regards
-----Original Message-----
From: Christopher Schultz [mailto:chris@christopherschultz.net]
Sent: Tuesday, April 22, 2014 8:07 PM
To: Tomcat Users List
Subject: Re: How to monitor performance of tomcat
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Randhir,
On 4/22/14, 10:03 AM, Randhir Singh wrote:
> I have come across a point which could be a reason, the catalina.out
> file has become 13G which came to notice when we were analysing space
> crunch on the mount point in which tomcat is located.
Does low-disk-space cause performance problems for you?
> Further to this, there is some log rotation which is happening.
> But, what should be the steps to check or to introduce log rotation
> otherwise.
Tomcat will rotate logs as directed. You will need to tell us about your
logging if you want help with this.
> Request you to please revert as it is urgent. I would be waiting for a
> revert.
Revert what?
- -chris
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preserve its confidentiality and delete it. Before opening any attachments
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Re: How to monitor performance of tomcat
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Randhir,
On 4/22/14, 10:03 AM, Randhir Singh wrote:
> I have come across a point which could be a reason, the
> catalina.out file has become 13G which came to notice when we were
> analysing space crunch on the mount point in which tomcat is
> located.
Does low-disk-space cause performance problems for you?
> Further to this, there is some log rotation which is happening.
> But, what should be the steps to check or to introduce log rotation
> otherwise.
Tomcat will rotate logs as directed. You will need to tell us about
your logging if you want help with this.
> Request you to please revert as it is urgent. I would be waiting
> for a revert.
Revert what?
- -chris
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Re: How to monitor performance of tomcat
Posted by Randhir Singh <ra...@sterlite.com>.
Hi,
I have come across a point which could be a reason, the catalina.out file
has become 13G which came to notice when we were analysing space crunch on
the mount point in which tomcat is located.
Further to this, there is some log rotation which is happening. But, what
should be the steps to check or to introduce log rotation otherwise.
Request you to please revert as it is urgent. I would be waiting for a
revert.
Regards
On Mon, Apr 21, 2014 at 3:47 PM, Randhir Singh
<ra...@sterlite.com>wrote:
> Hi,
>
> I wanted input from the experts on my query below that the port 8891 does
> not respond when the command,
>
> jconsole 10.101.17.79:8891
>
> is issued when the application hangs and stops responding.
>
> Requesting inputs so that the root cause analysis of this issue can be
> found out.
>
> Regards
>
> -----Original Message-----
> From: Randhir Singh [mailto:randhir.singh@sterlite.com]
> Sent: Tuesday, April 15, 2014 4:20 PM
> To: 'Tomcat Users List'
> Subject: RE: How to monitor performance of tomcat
>
> There is 1 finding. We normally monitor the tomcat port using jconsole as-
>
> jconsole 10.101.17.79:8891
>
> As per my initial query, our application hangs and we need to restart
> JBoss & Tomcat. I have observed that during this time the port 8891 does
> not respond as the command,
>
> jconsole 10.101.17.79:8891
>
> does not give any console for monitoring.
>
> Requesting an update so that the root cause analysis of this issue can be
> found out.
>
> Regards
>
> -----Original Message-----
> From: Shanti Suresh [mailto:shanti@umich.edu]
> Sent: Saturday, April 12, 2014 1:12 AM
> To: Tomcat Users List
> Subject: Re: How to monitor performance of tomcat
>
> On Fri, Apr 11, 2014 at 3:04 PM, André Warnier <aw...@ice-sa.com> wrote:
>
> > Shanti Suresh wrote:
> >
> >> Hi Chris,
> >>
> >> On Fri, Apr 11, 2014 at 12:17 PM, Christopher Schultz <
> >> chris@christopherschultz.net> wrote:
> >>
> >> -----BEGIN PGP SIGNED MESSAGE-----
> >>> Hash: SHA256
> >>>
> >>> Shanti,
> >>>
> >>> On 4/11/14, 9:01 AM, Shanti Suresh wrote:
> >>>
> >>>> Thank you! Great presentation and most wonderful notes! One
> >>>> question - on slide #48, where the notes say, "You can see here
> >>>> that the current usage is about 100MiB, less than the 115MiB
> >>>> threshold we set", where is the 100MB or thereabouts shown? Is it
> >>>> the committed value? I don't follow that statement.
> >>>>
> >>> The statement refers to the "used" value.
> >>>
> >>> - -chris
> >>>
> >>> Thank you! I got it.
> >>>
> >>
> >> The "used" value says "used 114510568". I was looking for a value
> >> closer to 100MiB.
> >>
> >
> > 114510568 (~ 109 MB)
> > - 104857600 (100 MB)
> > ===========
> > 9652968 (~ 9 MB)
> >
> > How much closer were you looking for ?
>
>
> Well, I don't know, maybe 1 or 2 MiB over? The threshold is 115 MiB, so
> if the notes had said "the current usage is less than the 115MiB threshold
> we set", I might not have had any doubt.
>
>
> >
> >
> >> So in the slide, you were making a point of the current usage being
> >> less than the threshold, basically, if I am not mistaken.
> >>
> >> Thanks,
> >>
> >> -Shanti
> >>
> >>
> >
> Thanks,
>
> -Shanti
>
--
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RE: How to monitor performance of tomcat
Posted by Randhir Singh <ra...@sterlite.com>.
Hi,
I wanted input from the experts on my query below that the port 8891 does
not respond when the command,
jconsole 10.101.17.79:8891
is issued when the application hangs and stops responding.
Requesting inputs so that the root cause analysis of this issue can be
found out.
Regards
-----Original Message-----
From: Randhir Singh [mailto:randhir.singh@sterlite.com]
Sent: Tuesday, April 15, 2014 4:20 PM
To: 'Tomcat Users List'
Subject: RE: How to monitor performance of tomcat
There is 1 finding. We normally monitor the tomcat port using jconsole as-
jconsole 10.101.17.79:8891
As per my initial query, our application hangs and we need to restart
JBoss & Tomcat. I have observed that during this time the port 8891 does
not respond as the command,
jconsole 10.101.17.79:8891
does not give any console for monitoring.
Requesting an update so that the root cause analysis of this issue can be
found out.
Regards
-----Original Message-----
From: Shanti Suresh [mailto:shanti@umich.edu]
Sent: Saturday, April 12, 2014 1:12 AM
To: Tomcat Users List
Subject: Re: How to monitor performance of tomcat
On Fri, Apr 11, 2014 at 3:04 PM, André Warnier <aw...@ice-sa.com> wrote:
> Shanti Suresh wrote:
>
>> Hi Chris,
>>
>> On Fri, Apr 11, 2014 at 12:17 PM, Christopher Schultz <
>> chris@christopherschultz.net> wrote:
>>
>> -----BEGIN PGP SIGNED MESSAGE-----
>>> Hash: SHA256
>>>
>>> Shanti,
>>>
>>> On 4/11/14, 9:01 AM, Shanti Suresh wrote:
>>>
>>>> Thank you! Great presentation and most wonderful notes! One
>>>> question - on slide #48, where the notes say, "You can see here
>>>> that the current usage is about 100MiB, less than the 115MiB
>>>> threshold we set", where is the 100MB or thereabouts shown? Is it
>>>> the committed value? I don't follow that statement.
>>>>
>>> The statement refers to the "used" value.
>>>
>>> - -chris
>>>
>>> Thank you! I got it.
>>>
>>
>> The "used" value says "used 114510568". I was looking for a value
>> closer to 100MiB.
>>
>
> 114510568 (~ 109 MB)
> - 104857600 (100 MB)
> ===========
> 9652968 (~ 9 MB)
>
> How much closer were you looking for ?
Well, I don't know, maybe 1 or 2 MiB over? The threshold is 115 MiB, so
if the notes had said "the current usage is less than the 115MiB threshold
we set", I might not have had any doubt.
>
>
>> So in the slide, you were making a point of the current usage being
>> less than the threshold, basically, if I am not mistaken.
>>
>> Thanks,
>>
>> -Shanti
>>
>>
>
Thanks,
-Shanti
--
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RE: How to monitor performance of tomcat
Posted by Randhir Singh <ra...@sterlite.com>.
There is 1 finding. We normally monitor the tomcat port using jconsole as-
jconsole 10.101.17.79:8891
As per my initial query, our application hangs and we need to restart
JBoss & Tomcat. I have observed that during this time the port 8891 does
not respond as the command,
jconsole 10.101.17.79:8891
does not give any console for monitoring.
Requesting an update so that the root cause analysis of this issue can be
found out.
Regards
-----Original Message-----
From: Shanti Suresh [mailto:shanti@umich.edu]
Sent: Saturday, April 12, 2014 1:12 AM
To: Tomcat Users List
Subject: Re: How to monitor performance of tomcat
On Fri, Apr 11, 2014 at 3:04 PM, André Warnier <aw...@ice-sa.com> wrote:
> Shanti Suresh wrote:
>
>> Hi Chris,
>>
>> On Fri, Apr 11, 2014 at 12:17 PM, Christopher Schultz <
>> chris@christopherschultz.net> wrote:
>>
>> -----BEGIN PGP SIGNED MESSAGE-----
>>> Hash: SHA256
>>>
>>> Shanti,
>>>
>>> On 4/11/14, 9:01 AM, Shanti Suresh wrote:
>>>
>>>> Thank you! Great presentation and most wonderful notes! One
>>>> question - on slide #48, where the notes say, "You can see here
>>>> that the current usage is about 100MiB, less than the 115MiB
>>>> threshold we set", where is the 100MB or thereabouts shown? Is it
>>>> the committed value? I don't follow that statement.
>>>>
>>> The statement refers to the "used" value.
>>>
>>> - -chris
>>>
>>> Thank you! I got it.
>>>
>>
>> The "used" value says "used 114510568". I was looking for a value
>> closer to 100MiB.
>>
>
> 114510568 (~ 109 MB)
> - 104857600 (100 MB)
> ===========
> 9652968 (~ 9 MB)
>
> How much closer were you looking for ?
Well, I don't know, maybe 1 or 2 MiB over? The threshold is 115 MiB, so
if the notes had said "the current usage is less than the 115MiB threshold
we set", I might not have had any doubt.
>
>
>> So in the slide, you were making a point of the current usage being
>> less than the threshold, basically, if I am not mistaken.
>>
>> Thanks,
>>
>> -Shanti
>>
>>
>
Thanks,
-Shanti
--
*STL Disclaimer:*
The content of this message may be legally privileged and confidential and
are for the use of the intended recipient(s) only. It should not be read,
copied and used by anyone other than the intended recipient(s). If you have
received this message in error, please immediately notify the sender,
preserve its confidentiality and delete it. Before opening any attachments
please check them for viruses and defects. No employee or agent is
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Please consider environment before printing this email !
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Re: How to monitor performance of tomcat
Posted by Shanti Suresh <sh...@umich.edu>.
On Fri, Apr 11, 2014 at 3:04 PM, André Warnier <aw...@ice-sa.com> wrote:
> Shanti Suresh wrote:
>
>> Hi Chris,
>>
>> On Fri, Apr 11, 2014 at 12:17 PM, Christopher Schultz <
>> chris@christopherschultz.net> wrote:
>>
>> -----BEGIN PGP SIGNED MESSAGE-----
>>> Hash: SHA256
>>>
>>> Shanti,
>>>
>>> On 4/11/14, 9:01 AM, Shanti Suresh wrote:
>>>
>>>> Thank you! Great presentation and most wonderful notes! One
>>>> question - on slide #48, where the notes say, "You can see here
>>>> that the current usage is about 100MiB, less than the 115MiB
>>>> threshold we set", where is the 100MB or thereabouts shown? Is it
>>>> the committed value? I don't follow that statement.
>>>>
>>> The statement refers to the "used" value.
>>>
>>> - -chris
>>>
>>> Thank you! I got it.
>>>
>>
>> The "used" value says "used 114510568". I was looking for a value closer
>> to 100MiB.
>>
>
> 114510568 (~ 109 MB)
> - 104857600 (100 MB)
> ===========
> 9652968 (~ 9 MB)
>
> How much closer were you looking for ?
Well, I don't know, maybe 1 or 2 MiB over? The threshold is 115 MiB, so if
the notes had said "the current usage is less than the 115MiB
threshold we set", I might not have had any doubt.
>
>
>> So in the slide, you were making a point of the current usage being less
>> than the threshold, basically, if I am not mistaken.
>>
>> Thanks,
>>
>> -Shanti
>>
>>
>
Thanks,
-Shanti
Re: How to monitor performance of tomcat
Posted by André Warnier <aw...@ice-sa.com>.
Shanti Suresh wrote:
> Hi Chris,
>
> On Fri, Apr 11, 2014 at 12:17 PM, Christopher Schultz <
> chris@christopherschultz.net> wrote:
>
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA256
>>
>> Shanti,
>>
>> On 4/11/14, 9:01 AM, Shanti Suresh wrote:
>>> Thank you! Great presentation and most wonderful notes! One
>>> question - on slide #48, where the notes say, "You can see here
>>> that the current usage is about 100MiB, less than the 115MiB
>>> threshold we set", where is the 100MB or thereabouts shown? Is it
>>> the committed value? I don't follow that statement.
>> The statement refers to the "used" value.
>>
>> - -chris
>>
>> Thank you! I got it.
>
> The "used" value says "used 114510568". I was looking for a value closer
> to 100MiB.
114510568 (~ 109 MB)
- 104857600 (100 MB)
===========
9652968 (~ 9 MB)
How much closer were you looking for ?
>
> So in the slide, you were making a point of the current usage being less
> than the threshold, basically, if I am not mistaken.
>
> Thanks,
>
> -Shanti
>
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Re: How to monitor performance of tomcat
Posted by Shanti Suresh <sh...@umich.edu>.
Hi Chris,
On Fri, Apr 11, 2014 at 12:17 PM, Christopher Schultz <
chris@christopherschultz.net> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
> Shanti,
>
> On 4/11/14, 9:01 AM, Shanti Suresh wrote:
> > Thank you! Great presentation and most wonderful notes! One
> > question - on slide #48, where the notes say, "You can see here
> > that the current usage is about 100MiB, less than the 115MiB
> > threshold we set", where is the 100MB or thereabouts shown? Is it
> > the committed value? I don't follow that statement.
>
> The statement refers to the "used" value.
>
> - -chris
>
> Thank you! I got it.
The "used" value says "used 114510568". I was looking for a value closer
to 100MiB.
So in the slide, you were making a point of the current usage being less
than the threshold, basically, if I am not mistaken.
Thanks,
-Shanti
Re: How to monitor performance of tomcat
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Shanti,
On 4/11/14, 9:01 AM, Shanti Suresh wrote:
> Thank you! Great presentation and most wonderful notes! One
> question - on slide #48, where the notes say, "You can see here
> that the current usage is about 100MiB, less than the 115MiB
> threshold we set", where is the 100MB or thereabouts shown? Is it
> the committed value? I don't follow that statement.
The statement refers to the "used" value.
- -chris
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Re: How to monitor performance of tomcat
Posted by Shanti Suresh <sh...@umich.edu>.
Hi Chris,
On Fri, Apr 11, 2014 at 10:48 AM, André Warnier <aw...@ice-sa.com> wrote:
>
>
>>>>> On 4/8/14, 5:24 PM, Christopher Schultz wrote:
>>>>> http://people.apache.org/~schultz/ApacheCon%20NA%202014/Monitoring<http://people.apache.org/~schultz/ApacheCon%20NA%202014/Monitoring%20>
>>>>> %20Apache%20Tomcat%20with%20JMX.odp<http://people.apache.org/%7Eschultz/ApacheCon%20NA%202014/Monitoring%20Apache%20Tomcat%20with%20JMX.odp>
>>>>
>>>>
>>>>>
>>>>> There's a PDF version with borked slide-notes in that directory if
>>>>> you can't read ODP.
>>>>>
>>>>>
>>>> Q: why do clocks never get stolen from government offices ?
> A: because there is always someone watching them
>
>
Thank you! Great presentation and most wonderful notes! One question - on
slide #48, where the notes say, "You can see here that the current usage is
about 100MiB, less than the 115MiB threshold we set", where is the 100MB or
thereabouts shown? Is it the committed value? I don't follow that
statement.
Thanks again,
-Shanti
Re: How to monitor performance of tomcat
Posted by André Warnier <aw...@ice-sa.com>.
Jeffrey Janner wrote:
>> -----Original Message-----
>> From: André Warnier [mailto:aw@ice-sa.com]
>> Sent: Friday, April 11, 2014 9:27 AM
>> To: Tomcat Users List
>> Subject: Re: How to monitor performance of tomcat
>>
>> Jeffrey Janner wrote:
>>>> -----Original Message-----
>>>> From: Christopher Schultz [mailto:chris@christopherschultz.net]
>>>> Sent: Friday, April 11, 2014 12:54 AM
>>>> To: Tomcat Users List
>>>> Subject: Re: How to monitor performance of tomcat
>>>>
>>>> All,
>>>>
>>>> On 4/8/14, 5:24 PM, Christopher Schultz wrote:
>>>>> Randir,
>>>>>
>>>>> On 4/8/14, 5:05 AM, Randhir Singh wrote:
>>>>>> We have an application which has JBoss as the application server
>>>> with
>>>>>> Tomcat as the web server, our application has Oracle 11g as the
>>>>>> database. I would give some further background to the issue we are
>>>>>> facing, since the last 1 1/2 months, the application slows down.
>>>>>> Sometimes it comes back to normal, specially on week-ends. But
>>>>>> other times we restart JBoss & Tomcat to bring back the
>> application
>>>>>> to normal.
>>>>>> We have been using jconsole to monitor tomcat like jconsole
>>>>>> 10.101.17.79:8891 which monitors our tomcat for a work order
>>>>>> system. If the memory usage does not show spike and shows constant
>>>>>> reading, the GC button is clicked to invoke the garbage collector.
>>>>> You should really never have to invoke the gc yourself. It gc isn't
>>>>> working properly by itself, you have a big problem.
>>>>>
>>>>>> I checked out on the net and got some clue as below:
>>>>>> 1) Javamelody - It seems to be a 3rd party tool which is not
>>>>>> recommended.
>>>>> Javamelody is just fine. What makes you think it's not
>> "recommended"?
>>>>>> 2) There is a command mentioned to see the admin console,
>>>>>> http://<IP:port>/ but it is not displaying the required page.
>>>>>> Please give your inputs whether jconsole should be a help in the
>>>>>> right direction or some other way to monitor the performance of
>>>>>> Tomcat.
>>>>> I suspect there's no chance you are in Denver for ApacheCon right
>>>> now,
>>>>> are you? I'm giving a presentation on it tomorrow. I'll post the
>>>>> slides later in the afternoon MDT.
>> http://people.apache.org/~schultz/ApacheCon%20NA%202014/Monitoring%20
>>>> Ap
>>>> ache%20Tomcat%20with%20JMX.odp
>>>>
>>>> There's a PDF version with borked slide-notes in that directory if
>>>> you can't read ODP.
>>>>
>>> Chris -
>>> The PDF file is not world readable.
>> It gets worse : it's not even a PDF.
>> ;-)
>> Coffee, Jeffrey.
>
> André -
> Perhaps you should get another cup. Make it expresso.
> Chris clearly states that there is *additionally* a PDF version, and that is the one that generates a permissions error.
> The ODP version downloads just fine, though PowerPoint complains about errors, it seems OK (I still perusing).
> I was trying to download the PDF version to use as a reference source for some of my less-technical staff.
> Jeff
>
Jeff.
I apologise.
I got a cup of (strong) coffee, and a Twix to go with it.
I have an excuse though : for me, it is Friday afternoon, just 15 minutes before 5 PM, at
the end of a long week. My attention was divided, between the Tomcat list and the clock on
the wall.
As an amend :
Q: why do clocks never get stolen from government offices ?
A: because there is always someone watching them
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RE: How to monitor performance of tomcat
Posted by Jeffrey Janner <Je...@PolyDyne.com>.
> -----Original Message-----
> From: André Warnier [mailto:aw@ice-sa.com]
> Sent: Friday, April 11, 2014 9:27 AM
> To: Tomcat Users List
> Subject: Re: How to monitor performance of tomcat
>
> Jeffrey Janner wrote:
> >> -----Original Message-----
> >> From: Christopher Schultz [mailto:chris@christopherschultz.net]
> >> Sent: Friday, April 11, 2014 12:54 AM
> >> To: Tomcat Users List
> >> Subject: Re: How to monitor performance of tomcat
> >>
> >> All,
> >>
> >> On 4/8/14, 5:24 PM, Christopher Schultz wrote:
> >>> Randir,
> >>>
> >>> On 4/8/14, 5:05 AM, Randhir Singh wrote:
> >>>> We have an application which has JBoss as the application server
> >> with
> >>>> Tomcat as the web server, our application has Oracle 11g as the
> >>>> database. I would give some further background to the issue we are
> >>>> facing, since the last 1 1/2 months, the application slows down.
> >>>> Sometimes it comes back to normal, specially on week-ends. But
> >>>> other times we restart JBoss & Tomcat to bring back the
> application
> >>>> to normal.
> >>>> We have been using jconsole to monitor tomcat like jconsole
> >>>> 10.101.17.79:8891 which monitors our tomcat for a work order
> >>>> system. If the memory usage does not show spike and shows constant
> >>>> reading, the GC button is clicked to invoke the garbage collector.
> >>> You should really never have to invoke the gc yourself. It gc isn't
> >>> working properly by itself, you have a big problem.
> >>>
> >>>> I checked out on the net and got some clue as below:
> >>>> 1) Javamelody - It seems to be a 3rd party tool which is not
> >>>> recommended.
> >>> Javamelody is just fine. What makes you think it's not
> "recommended"?
> >>>
> >>>> 2) There is a command mentioned to see the admin console,
> >>>> http://<IP:port>/ but it is not displaying the required page.
> >>>> Please give your inputs whether jconsole should be a help in the
> >>>> right direction or some other way to monitor the performance of
> >>>> Tomcat.
> >>> I suspect there's no chance you are in Denver for ApacheCon right
> >> now,
> >>> are you? I'm giving a presentation on it tomorrow. I'll post the
> >>> slides later in the afternoon MDT.
> >>
> http://people.apache.org/~schultz/ApacheCon%20NA%202014/Monitoring%20
> >> Ap
> >> ache%20Tomcat%20with%20JMX.odp
> >>
> >> There's a PDF version with borked slide-notes in that directory if
> >> you can't read ODP.
> >>
> > Chris -
> > The PDF file is not world readable.
>
> It gets worse : it's not even a PDF.
> ;-)
> Coffee, Jeffrey.
André -
Perhaps you should get another cup. Make it expresso.
Chris clearly states that there is *additionally* a PDF version, and that is the one that generates a permissions error.
The ODP version downloads just fine, though PowerPoint complains about errors, it seems OK (I still perusing).
I was trying to download the PDF version to use as a reference source for some of my less-technical staff.
Jeff
Re: How to monitor performance of tomcat
Posted by André Warnier <aw...@ice-sa.com>.
Jeffrey Janner wrote:
>> -----Original Message-----
>> From: Christopher Schultz [mailto:chris@christopherschultz.net]
>> Sent: Friday, April 11, 2014 12:54 AM
>> To: Tomcat Users List
>> Subject: Re: How to monitor performance of tomcat
>>
>> All,
>>
>> On 4/8/14, 5:24 PM, Christopher Schultz wrote:
>>> Randir,
>>>
>>> On 4/8/14, 5:05 AM, Randhir Singh wrote:
>>>> We have an application which has JBoss as the application server
>> with
>>>> Tomcat as the web server, our application has Oracle 11g as the
>>>> database. I would give some further background to the issue we are
>>>> facing, since the last 1 1/2 months, the application slows down.
>>>> Sometimes it comes back to normal, specially on week-ends. But other
>>>> times we restart JBoss & Tomcat to bring back the application to
>>>> normal.
>>>> We have been using jconsole to monitor tomcat like
>>>> jconsole 10.101.17.79:8891
>>>> which monitors our tomcat for a work order system. If the memory
>>>> usage does not show spike and shows constant reading, the GC button
>>>> is clicked to invoke the garbage collector.
>>> You should really never have to invoke the gc yourself. It gc isn't
>>> working properly by itself, you have a big problem.
>>>
>>>> I checked out on the net and got some clue as below:
>>>> 1) Javamelody - It seems to be a 3rd party tool which is not
>>>> recommended.
>>> Javamelody is just fine. What makes you think it's not "recommended"?
>>>
>>>> 2) There is a command mentioned to see the admin console,
>>>> http://<IP:port>/ but it is not displaying the required page.
>>>> Please give your inputs whether jconsole should be a help in the
>>>> right direction or some other way to monitor the performance of
>>>> Tomcat.
>>> I suspect there's no chance you are in Denver for ApacheCon right
>> now,
>>> are you? I'm giving a presentation on it tomorrow. I'll post the
>>> slides later in the afternoon MDT.
>> http://people.apache.org/~schultz/ApacheCon%20NA%202014/Monitoring%20Ap
>> ache%20Tomcat%20with%20JMX.odp
>>
>> There's a PDF version with borked slide-notes in that directory if you
>> can't read ODP.
>>
> Chris -
> The PDF file is not world readable.
It gets worse : it's not even a PDF.
;-)
Coffee, Jeffrey.
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Re: How to monitor performance of tomcat
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Jeff,
On 4/11/14, 8:20 AM, Jeffrey Janner wrote:
>> -----Original Message----- From: Christopher Schultz
>> [mailto:chris@christopherschultz.net] Sent: Friday, April 11,
>> 2014 12:54 AM To: Tomcat Users List Subject: Re: How to monitor
>> performance of tomcat
>>
>> All,
>>
>> On 4/8/14, 5:24 PM, Christopher Schultz wrote:
>>> Randir,
>>>
>>> On 4/8/14, 5:05 AM, Randhir Singh wrote:
>>>> We have an application which has JBoss as the application
>>>> server
>> with
>>>> Tomcat as the web server, our application has Oracle 11g as
>>>> the database. I would give some further background to the
>>>> issue we are facing, since the last 1 1/2 months, the
>>>> application slows down. Sometimes it comes back to normal,
>>>> specially on week-ends. But other times we restart JBoss &
>>>> Tomcat to bring back the application to normal.
>>>
>>>> We have been using jconsole to monitor tomcat like
>>>
>>>> jconsole 10.101.17.79:8891
>>>
>>>> which monitors our tomcat for a work order system. If the
>>>> memory usage does not show spike and shows constant reading,
>>>> the GC button is clicked to invoke the garbage collector.
>>>
>>> You should really never have to invoke the gc yourself. It gc
>>> isn't working properly by itself, you have a big problem.
>>>
>>>> I checked out on the net and got some clue as below:
>>>
>>>> 1) Javamelody - It seems to be a 3rd party tool which is
>>>> not recommended.
>>>
>>> Javamelody is just fine. What makes you think it's not
>>> "recommended"?
>>>
>>>> 2) There is a command mentioned to see the admin
>>>> console, http://<IP:port>/ but it is not displaying the
>>>> required page.
>>>
>>>> Please give your inputs whether jconsole should be a help in
>>>> the right direction or some other way to monitor the
>>>> performance of Tomcat.
>>>
>>> I suspect there's no chance you are in Denver for ApacheCon
>>> right
>> now,
>>> are you? I'm giving a presentation on it tomorrow. I'll post
>>> the slides later in the afternoon MDT.
>>
>> http://people.apache.org/~schultz/ApacheCon%20NA%202014/Monitoring%20Ap
>>
>>
ache%20Tomcat%20with%20JMX.odp
>>
>> There's a PDF version with borked slide-notes in that directory
>> if you can't read ODP.
>>
> Chris - The PDF file is not world readable.
D'oh. How did that happen? Fixed.
- -chris
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RE: How to monitor performance of tomcat
Posted by Jeffrey Janner <Je...@PolyDyne.com>.
> -----Original Message-----
> From: Christopher Schultz [mailto:chris@christopherschultz.net]
> Sent: Friday, April 11, 2014 12:54 AM
> To: Tomcat Users List
> Subject: Re: How to monitor performance of tomcat
>
> All,
>
> On 4/8/14, 5:24 PM, Christopher Schultz wrote:
> > Randir,
> >
> > On 4/8/14, 5:05 AM, Randhir Singh wrote:
> >> We have an application which has JBoss as the application server
> with
> >> Tomcat as the web server, our application has Oracle 11g as the
> >> database. I would give some further background to the issue we are
> >> facing, since the last 1 1/2 months, the application slows down.
> >> Sometimes it comes back to normal, specially on week-ends. But other
> >> times we restart JBoss & Tomcat to bring back the application to
> >> normal.
> >
> >> We have been using jconsole to monitor tomcat like
> >
> >> jconsole 10.101.17.79:8891
> >
> >> which monitors our tomcat for a work order system. If the memory
> >> usage does not show spike and shows constant reading, the GC button
> >> is clicked to invoke the garbage collector.
> >
> > You should really never have to invoke the gc yourself. It gc isn't
> > working properly by itself, you have a big problem.
> >
> >> I checked out on the net and got some clue as below:
> >
> >> 1) Javamelody - It seems to be a 3rd party tool which is not
> >> recommended.
> >
> > Javamelody is just fine. What makes you think it's not "recommended"?
> >
> >> 2) There is a command mentioned to see the admin console,
> >> http://<IP:port>/ but it is not displaying the required page.
> >
> >> Please give your inputs whether jconsole should be a help in the
> >> right direction or some other way to monitor the performance of
> >> Tomcat.
> >
> > I suspect there's no chance you are in Denver for ApacheCon right
> now,
> > are you? I'm giving a presentation on it tomorrow. I'll post the
> > slides later in the afternoon MDT.
>
> http://people.apache.org/~schultz/ApacheCon%20NA%202014/Monitoring%20Ap
> ache%20Tomcat%20with%20JMX.odp
>
> There's a PDF version with borked slide-notes in that directory if you
> can't read ODP.
>
Chris -
The PDF file is not world readable.
Jeff
Re: How to monitor performance of tomcat
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
All,
On 4/8/14, 5:24 PM, Christopher Schultz wrote:
> Randir,
>
> On 4/8/14, 5:05 AM, Randhir Singh wrote:
>> We have an application which has JBoss as the application server
>> with Tomcat as the web server, our application has Oracle 11g as
>> the database. I would give some further background to the issue
>> we are facing, since the last 1 1/2 months, the application
>> slows down. Sometimes it comes back to normal, specially on
>> week-ends. But other times we restart JBoss & Tomcat to bring
>> back the application to normal.
>
>> We have been using jconsole to monitor tomcat like
>
>> jconsole 10.101.17.79:8891
>
>> which monitors our tomcat for a work order system. If the memory
>> usage does not show spike and shows constant reading, the GC
>> button is clicked to invoke the garbage collector.
>
> You should really never have to invoke the gc yourself. It gc
> isn't working properly by itself, you have a big problem.
>
>> I checked out on the net and got some clue as below:
>
>> 1) Javamelody - It seems to be a 3rd party tool which is not
>> recommended.
>
> Javamelody is just fine. What makes you think it's not
> "recommended"?
>
>> 2) There is a command mentioned to see the admin console,
>> http://<IP:port>/ but it is not displaying the required page.
>
>> Please give your inputs whether jconsole should be a help in the
>> right direction or some other way to monitor the performance of
>> Tomcat.
>
> I suspect there's no chance you are in Denver for ApacheCon right
> now, are you? I'm giving a presentation on it tomorrow. I'll post
> the slides later in the afternoon MDT.
http://people.apache.org/~schultz/ApacheCon%20NA%202014/Monitoring%20Apache%20Tomcat%20with%20JMX.odp
There's a PDF version with borked slide-notes in that directory if you
can't read ODP.
- -chris
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Re: How to monitor performance of tomcat
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Randir,
On 4/8/14, 5:05 AM, Randhir Singh wrote:
> We have an application which has JBoss as the application server
> with Tomcat as the web server, our application has Oracle 11g as
> the database. I would give some further background to the issue we
> are facing, since the last 1 1/2 months, the application slows
> down. Sometimes it comes back to normal, specially on week-ends.
> But other times we restart JBoss & Tomcat to bring back the
> application to normal.
>
> We have been using jconsole to monitor tomcat like
>
> jconsole 10.101.17.79:8891
>
> which monitors our tomcat for a work order system. If the memory
> usage does not show spike and shows constant reading, the GC button
> is clicked to invoke the garbage collector.
You should really never have to invoke the gc yourself. It gc isn't
working properly by itself, you have a big problem.
> I checked out on the net and got some clue as below:
>
> 1) Javamelody - It seems to be a 3rd party tool which is not
> recommended.
Javamelody is just fine. What makes you think it's not "recommended"?
> 2) There is a command mentioned to see the admin console,
> http://<IP:port>/ but it is not displaying the required page.
>
> Please give your inputs whether jconsole should be a help in the
> right direction or some other way to monitor the performance of
> Tomcat.
I suspect there's no chance you are in Denver for ApacheCon right now,
are you? I'm giving a presentation on it tomorrow. I'll post the
slides later in the afternoon MDT.
- -chris
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Re: How to monitor performance of tomcat
Posted by Konstantin Kolinko <kn...@gmail.com>.
2014-04-08 15:05 GMT+04:00 Randhir Singh <ra...@sterlite.com>:
> We have an application which has JBoss as the application server with
> Tomcat as the web server, our application has Oracle 11g as the database. I
> would give some further background to the issue we are facing, since the
> last 1 1/2 months, the application slows down. Sometimes it comes back to
> normal, specially on week-ends. But other times we restart JBoss & Tomcat
> to bring back the application to normal.
>
>
>
> We have been using jconsole to monitor tomcat like
>
>
>
> jconsole 10.101.17.79:8891
>
>
>
> which monitors our tomcat for a work order system. If the memory usage does
> not show spike and shows constant reading, the GC button is clicked to
> invoke the garbage collector.
>
>
>
> I checked out on the net and got some clue as below:
>
>
>
> 1) Javamelody - It seems to be a 3rd party tool which is not
> recommended.
>
> 2) There is a command mentioned to see the admin console,
> http://<IP:port>/ but it is not displaying the required page.
>
>
>
> Please give your inputs whether jconsole should be a help in the right
> direction or some other way to monitor the performance of Tomcat.
>
Have you tried
1) FAQ
2) archives of this mailing list?
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