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Posted to users@tomcat.apache.org by Arshiya Shariff <ar...@ericsson.com.INVALID> on 2020/09/11 17:06:54 UTC
Track native memory of a Tomcat application
Hi All,
We have a standalone tomcat web application(Version 9.0.22) which runs on Linux . The application is used to process only a single http request.
But the physical memory usage of the application has increased to 4GB (output from the "top" command of Linux) , of which the heap has only 16 MB of live data.
Is there a way to track the native memory of a tomcat process ?
Thanks and Regards
Arshiya Shariff
Re: AW: Track native memory of a Tomcat application
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Andreas,
On 9/14/20 05:03, Döscher, Andreas (ESI) wrote:
> Moin, ah! The no-xmx-mistake! If you ommit the memory limitation,
> java uses (on server-class machines) as default 1/4 of the
> physical memory. (I found this blog entry
>
https://blog.openj9.org/2020/04/30/default-java-maximum-heap-size-is-cha
nged-for-java-8/)
It's more complicated than that, but yes, Arshiya I believe what you are
seeing is completely normal. When there is no memory pressure, the GC
won't actually do anything for a loooong time. And you'll see the
maximum heap space used. Since you didn't pick a maximum heap space on
startup, the JVM picked a "reasonable" one for you. Its definition of
"reasonable" may not match yours. :)
Try adding this to whatever launches your JVM:
-Xmx32M
That's usually enough to run Tomcat and an application that doesn't
need very much memory. I've been able to get an application to run in
12MiB before, but IIRC it required disabling a few things Tomcat does
out-of-the-box to fully-adhere to the servlet and other specifications.
- -chris
> -----Ursprüngliche Nachricht----- Von: Arshiya Shariff
> <ar...@ericsson.com.INVALID> Gesendet: Montag, 14.
> September 2020 10:17 An: Tomcat Users List
> <us...@tomcat.apache.org> Betreff: RE: Track native memory of a
> Tomcat application
>
> Hi All,
>
> Thank you for the response Christopher .
>
> * A single request, or a single *type* of request? A single
> request (http/https) that is hit once per day
>
> * Does it increase as the request is processed, or does the JVM
> take
that 4GiB immediately upon startup?
> The tomcat process was started 3 months back , but the memory has
increased gradually to 4GB though it does not process requests
continuously (one request per day).
>
> * The first thing to do would be to post the effective
> command-line
options that are being used when launching your JVM. One of the
easiest ways to do that is to run "ps | grep catalina" which will give
you the full command-line for the process.
> There is no Xmx set: ogw 30853 0.1 3.1 22048736 2068856 ? Sl
> Jun09 154:10
/opt/java//jdk1.8.0_201-amd64/bin/java
- -Djava.util.logging.config.file=/opt/webstart//conf/logging.properties
- -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
- -Djdk.tls.ephemeralDHKeySize=2048
- -Djava.protocol.handler.pkgs=org.apache.catalina.webresources
- -Dorg.apache.catalina.security.SecurityListener.UMASK=0027
- -Dorg.apache.catalina.connector.CoyoteAdapter.ALLOW_BACKSLASH=false
- -Dorg.apache.tomcat.util.buf.UDecoder.ALLOW_ENCODED_SLASH=false
- -Dorg.apache.coyote.USE_CUSTOM_STATUS_MSG_IN_HEADER=false
- -Dorg.apache.catalina.connector.RECYCLE_FACADES=false
- -Dignore.endorsed.dirs= -classpath
/opt/webstart//bin/bootstrap.jar:/opt/webstart//bin/tomcat-juli.jar
- -Dcatalina.base=/opt/webstart/ -Dcatalina.home=/opt/webstart/
- -Djava.io.tmpdir=/opt/webstart//temp
org.apache.catalina.startup.Bootstrap start
>
> Thanks and Regards Arshiya Shariff
>
>
> -----Original Message----- From: Christopher Schultz
> <ch...@christopherschultz.net> Sent: Friday, September 11, 2020
> 10:54 PM To: users@tomcat.apache.org Subject: Re: Track native
> memory of a Tomcat application
>
> Arshiya,
>
> On 9/11/20 13:06, Arshiya Shariff wrote:
>> We have a standalone tomcat web application(Version 9.0.22)
>> which runs on Linux . The application is used to process only a
>> single http request.
>
> A single request, or a single *type* of request?
>
>> But the physical memory usage of the application has increased
>> to 4GB (output from the "top" command of Linux) , of which the
>> heap has only 16 MB of live data.
>
> Does it increase as the request is processed, or does the JVM take
> that 4GiB immediately upon startup?
>
> Remember that the heap is only a part of the JVM's memory usage.
> Examples of things that don't go into the heap are the native
> memory used by the JVM itself (thinking of the JVM itself as a
> usual OS process), stacks for each native thread, compiled Java
> code produced by the JIT, and various I/O buffers.
>
>> Is there a way to track the native memory of a tomcat process ?
>
> The native memory of a Java application is very difficult to
> inspect, etc. unless you are *very* familiar with JVMs, the memory
> manager being used by your JVM, and the platform and architecture
> on which the JVM is running.
>
> The first thing to do would be to post the effective command-line
> options that are being used when launching your JVM. One of the
> easiest ways to do that is to run "ps | grep catalina" which will
> give you the full command-line for the process.
>
> That will show any memory parameters you may have specified on the
> JVM at launch time, which will definitely affect the amount of
> native memory your JVM process might end up taking up.
>
> -chris
>
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AW: Track native memory of a Tomcat application
Posted by Döscher,
"Andreas (ESI)" <an...@adp.com.INVALID>.
Moin,
ah! The no-xmx-mistake! If you ommit the memory limitation, java uses (on server-class machines) as default 1/4 of the physical memory.
(I found this blog entry https://blog.openj9.org/2020/04/30/default-java-maximum-heap-size-is-changed-for-java-8/)
Ciao,
Andreas
-----Ursprüngliche Nachricht-----
Von: Arshiya Shariff <ar...@ericsson.com.INVALID>
Gesendet: Montag, 14. September 2020 10:17
An: Tomcat Users List <us...@tomcat.apache.org>
Betreff: RE: Track native memory of a Tomcat application
Hi All,
Thank you for the response Christopher .
* A single request, or a single *type* of request?
A single request (http/https) that is hit once per day
* Does it increase as the request is processed, or does the JVM take that 4GiB immediately upon startup?
The tomcat process was started 3 months back , but the memory has increased gradually to 4GB though it does not process requests continuously (one request per day).
* The first thing to do would be to post the effective command-line options that are being used when launching your JVM. One of the easiest ways to do that is to run "ps | grep catalina" which will give you the full command-line for the process.
There is no Xmx set:
ogw 30853 0.1 3.1 22048736 2068856 ? Sl Jun09 154:10 /opt/java//jdk1.8.0_201-amd64/bin/java -Djava.util.logging.config.file=/opt/webstart//conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dorg.apache.catalina.connector.CoyoteAdapter.ALLOW_BACKSLASH=false -Dorg.apache.tomcat.util.buf.UDecoder.ALLOW_ENCODED_SLASH=false -Dorg.apache.coyote.USE_CUSTOM_STATUS_MSG_IN_HEADER=false -Dorg.apache.catalina.connector.RECYCLE_FACADES=false -Dignore.endorsed.dirs= -classpath /opt/webstart//bin/bootstrap.jar:/opt/webstart//bin/tomcat-juli.jar -Dcatalina.base=/opt/webstart/ -Dcatalina.home=/opt/webstart/ -Djava.io.tmpdir=/opt/webstart//temp org.apache.catalina.startup.Bootstrap start
Thanks and Regards
Arshiya Shariff
-----Original Message-----
From: Christopher Schultz <ch...@christopherschultz.net>
Sent: Friday, September 11, 2020 10:54 PM
To: users@tomcat.apache.org
Subject: Re: Track native memory of a Tomcat application
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Arshiya,
On 9/11/20 13:06, Arshiya Shariff wrote:
> We have a standalone tomcat web application(Version 9.0.22) which runs
> on Linux . The application is used to process only a single http
> request.
A single request, or a single *type* of request?
> But the physical memory usage of the application has increased to 4GB
> (output from the "top" command of Linux) , of which the heap has only
> 16 MB of live data.
Does it increase as the request is processed, or does the JVM take that 4GiB immediately upon startup?
Remember that the heap is only a part of the JVM's memory usage.
Examples of things that don't go into the heap are the native memory used by the JVM itself (thinking of the JVM itself as a usual OS process), stacks for each native thread, compiled Java code produced by the JIT, and various I/O buffers.
> Is there a way to track the native memory of a tomcat process ?
The native memory of a Java application is very difficult to inspect, etc. unless you are *very* familiar with JVMs, the memory manager being used by your JVM, and the platform and architecture on which the JVM is running.
The first thing to do would be to post the effective command-line options that are being used when launching your JVM. One of the easiest ways to do that is to run "ps | grep catalina" which will give you the full command-line for the process.
That will show any memory parameters you may have specified on the JVM at launch time, which will definitely affect the amount of native memory your JVM process might end up taking up.
- -chris
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RE: Track native memory of a Tomcat application
Posted by Arshiya Shariff <ar...@ericsson.com.INVALID>.
Hi All,
Thank you for the response Christopher .
* A single request, or a single *type* of request?
A single request (http/https) that is hit once per day
* Does it increase as the request is processed, or does the JVM take that 4GiB immediately upon startup?
The tomcat process was started 3 months back , but the memory has increased gradually to 4GB though it does not process requests continuously (one request per day).
* The first thing to do would be to post the effective command-line options that are being used when launching your JVM. One of the easiest ways to do that is to run "ps | grep catalina" which will give you the full command-line for the process.
There is no Xmx set:
ogw 30853 0.1 3.1 22048736 2068856 ? Sl Jun09 154:10 /opt/java//jdk1.8.0_201-amd64/bin/java -Djava.util.logging.config.file=/opt/webstart//conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dorg.apache.catalina.connector.CoyoteAdapter.ALLOW_BACKSLASH=false -Dorg.apache.tomcat.util.buf.UDecoder.ALLOW_ENCODED_SLASH=false -Dorg.apache.coyote.USE_CUSTOM_STATUS_MSG_IN_HEADER=false -Dorg.apache.catalina.connector.RECYCLE_FACADES=false -Dignore.endorsed.dirs= -classpath /opt/webstart//bin/bootstrap.jar:/opt/webstart//bin/tomcat-juli.jar -Dcatalina.base=/opt/webstart/ -Dcatalina.home=/opt/webstart/ -Djava.io.tmpdir=/opt/webstart//temp org.apache.catalina.startup.Bootstrap start
Thanks and Regards
Arshiya Shariff
-----Original Message-----
From: Christopher Schultz <ch...@christopherschultz.net>
Sent: Friday, September 11, 2020 10:54 PM
To: users@tomcat.apache.org
Subject: Re: Track native memory of a Tomcat application
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Arshiya,
On 9/11/20 13:06, Arshiya Shariff wrote:
> We have a standalone tomcat web application(Version 9.0.22) which runs
> on Linux . The application is used to process only a single http
> request.
A single request, or a single *type* of request?
> But the physical memory usage of the application has increased to 4GB
> (output from the "top" command of Linux) , of which the heap has only
> 16 MB of live data.
Does it increase as the request is processed, or does the JVM take that 4GiB immediately upon startup?
Remember that the heap is only a part of the JVM's memory usage.
Examples of things that don't go into the heap are the native memory used by the JVM itself (thinking of the JVM itself as a usual OS process), stacks for each native thread, compiled Java code produced by the JIT, and various I/O buffers.
> Is there a way to track the native memory of a tomcat process ?
The native memory of a Java application is very difficult to inspect, etc. unless you are *very* familiar with JVMs, the memory manager being used by your JVM, and the platform and architecture on which the JVM is running.
The first thing to do would be to post the effective command-line options that are being used when launching your JVM. One of the easiest ways to do that is to run "ps | grep catalina" which will give you the full command-line for the process.
That will show any memory parameters you may have specified on the JVM at launch time, which will definitely affect the amount of native memory your JVM process might end up taking up.
- -chris
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Re: Track native memory of a Tomcat application
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Arshiya,
On 9/11/20 13:06, Arshiya Shariff wrote:
> We have a standalone tomcat web application(Version 9.0.22) which
> runs on Linux . The application is used to process only a single
> http request.
A single request, or a single *type* of request?
> But the physical memory usage of the application has increased to
> 4GB (output from the "top" command of Linux) , of which the heap
> has only 16 MB of live data.
Does it increase as the request is processed, or does the JVM take that
4GiB immediately upon startup?
Remember that the heap is only a part of the JVM's memory usage.
Examples of things that don't go into the heap are the native memory
used by the JVM itself (thinking of the JVM itself as a usual OS
process), stacks for each native thread, compiled Java code produced
by the JIT, and various I/O buffers.
> Is there a way to track the native memory of a tomcat process ?
The native memory of a Java application is very difficult to inspect,
etc. unless you are *very* familiar with JVMs, the memory manager being
used by your JVM, and the platform and architecture on which the JVM is
running.
The first thing to do would be to post the effective command-line
options that are being used when launching your JVM. One of the
easiest ways to do that is to run "ps | grep catalina" which will give
you the full command-line for the process.
That will show any memory parameters you may have specified on the JVM
at launch time, which will definitely affect the amount of native
memory your JVM process might end up taking up.
- -chris
-----BEGIN PGP SIGNATURE-----
Comment: Using GnuPG with Thunderbird - https://www.enigmail.net/
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Re: Track native memory of a Tomcat application
Posted by calder <ca...@gmail.com>.
On Fri, Sep 11, 2020, 12:07 Arshiya Shariff
<ar...@ericsson.com.invalid> wrote:
> Hi All,
> We have a standalone tomcat web application(Version 9.0.22) which runs on
> Linux . The application is used to process only a single http request.
> But the physical memory usage of the application has increased to 4GB
> (output from the "top" command of Linux) , of which the heap has only 16 MB
> of live data.
> Is there a way to track the native memory of a tomcat process ?
>
jvisualvm
jconsole
Java Mission Control