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Posted to users@tomcat.apache.org by Ben Glorie <be...@bricsnet.com> on 2002/12/27 18:59:45 UTC
Tomcat stability problem
We're running Tomcat 4.1.12 on a dual-proc PIII with 512MB RAM. The
application consists of 100,000+ HTML pages and approx. 100 jsp pages. We
get approx. 60,000 page views per day. Performance is fine, but occasionally
the system runs into the following problem:
- when you request a jsp page in the browser, there is a delay of 5-10
seconds, then the page is loaded into the browser
- even though the HTML code is complete and all images are visible, the
browser still appears to be loading something ("load" bar is creeping)
- then after approx. 30 seconds the loading stops (because of a page
timeout?)
- static HTML pages are not affected, they load as quickly as usual
Although the problem seems to happen more frequently on busy days, it does
not seem to be related to peak traffic: it has also happened at quiet times,
and sometimes within an hour after a Tomcat restart (up to 4 days after a
restart). Does anybody have any ideas on what is happening and how we can
solve it? Some configuration details:
- catalina.sh:
CATALINA_OPTS="-Xmx128M"
(we've ordered more RAM, as soon as it has arrived we're planning to change
this to -Xmx512M
- server.xml:
<Connector className="org.apache.coyote.tomcat4.CoyoteConnector"
port="80" minProcessors="10" maxProcessors="110"
enableLookups="true" redirectPort="8443"
acceptCount="10" debug="0" connectionTimeout="10000"
useURIValidationHack="false" />
- web.xml (on public site):
<session-config>
<session-timeout>10</session-timeout>
</session-config>
Thanks a lot for your help.
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Re: Tomcat stability problem
Posted by Bill Barker <wb...@wilshire.com>.
As much as I respect Remy's opinions, this looks very much like a typical GC
delay. You might want to experiment with the 'incremental-gc' option on
your JVM (the actual syntax varies by vendor: try 'java -help' to see which
option to use).
"Remy Maucherat" <re...@apache.org> wrote in message
news:3E0CC954.4080800@apache.org...
> Ben Glorie wrote:
> > We're running Tomcat 4.1.12 on a dual-proc PIII with 512MB RAM. The
> > application consists of 100,000+ HTML pages and approx. 100 jsp pages.
We
> > get approx. 60,000 page views per day. Performance is fine, but
occasionally
> > the system runs into the following problem:
> >
> > - when you request a jsp page in the browser, there is a delay of 5-10
> > seconds, then the page is loaded into the browser
> > - even though the HTML code is complete and all images are visible, the
> > browser still appears to be loading something ("load" bar is creeping)
> > - then after approx. 30 seconds the loading stops (because of a page
> > timeout?)
> > - static HTML pages are not affected, they load as quickly as usual
>
> Before trying to look into this further, I would upgrade to Tomcat
> 4.1.18, and see if there are still problems.
>
> Remy
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Re: Tomcat stability problem
Posted by Remy Maucherat <re...@apache.org>.
Ben Glorie wrote:
> We're running Tomcat 4.1.12 on a dual-proc PIII with 512MB RAM. The
> application consists of 100,000+ HTML pages and approx. 100 jsp pages. We
> get approx. 60,000 page views per day. Performance is fine, but occasionally
> the system runs into the following problem:
>
> - when you request a jsp page in the browser, there is a delay of 5-10
> seconds, then the page is loaded into the browser
> - even though the HTML code is complete and all images are visible, the
> browser still appears to be loading something ("load" bar is creeping)
> - then after approx. 30 seconds the loading stops (because of a page
> timeout?)
> - static HTML pages are not affected, they load as quickly as usual
Before trying to look into this further, I would upgrade to Tomcat
4.1.18, and see if there are still problems.
Remy
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RE: Tomcat stability problem
Posted by Ben Glorie <be...@bricsnet.com>.
This happens anywhere between a few hours and a few days after a restart of
Tomcat. On quiet days as well as on busy days.
I have set -Xincgc (despite the performance decrease that this is likely to
cause) but need more time to know if that helps. I have also found a few
places where I can improve my code (in particular, database connections were
sometimes not closed); perhaps that will also have a positive effect.
-----Original Message-----
From: Jim D. Results [mailto:jdonelson@resultstel.com]
Sent: Monday, December 30, 2002 2:39 PM
To: Tomcat Users List; ben.glorie@bricsnet.com
Subject: Re: Tomcat stability problem
Could be the VM garbage collecting ?
How often does this happen ?
Jim D.
----- Original Message -----
From: "Ben Glorie" <be...@bricsnet.com>
To: <to...@jakarta.apache.org>
Sent: Friday, December 27, 2002 12:59 PM
Subject: Tomcat stability problem
> We're running Tomcat 4.1.12 on a dual-proc PIII with 512MB RAM. The
> application consists of 100,000+ HTML pages and approx. 100 jsp pages. We
> get approx. 60,000 page views per day. Performance is fine, but
occasionally
> the system runs into the following problem:
>
> - when you request a jsp page in the browser, there is a delay of 5-10
> seconds, then the page is loaded into the browser
> - even though the HTML code is complete and all images are visible, the
> browser still appears to be loading something ("load" bar is creeping)
> - then after approx. 30 seconds the loading stops (because of a page
> timeout?)
> - static HTML pages are not affected, they load as quickly as usual
>
> Although the problem seems to happen more frequently on busy days, it does
> not seem to be related to peak traffic: it has also happened at quiet
times,
> and sometimes within an hour after a Tomcat restart (up to 4 days after a
> restart). Does anybody have any ideas on what is happening and how we can
> solve it? Some configuration details:
>
> - catalina.sh:
> CATALINA_OPTS="-Xmx128M"
> (we've ordered more RAM, as soon as it has arrived we're planning to
change
> this to -Xmx512M
>
> - server.xml:
> <Connector className="org.apache.coyote.tomcat4.CoyoteConnector"
> port="80" minProcessors="10" maxProcessors="110"
> enableLookups="true" redirectPort="8443"
> acceptCount="10" debug="0" connectionTimeout="10000"
> useURIValidationHack="false" />
>
> - web.xml (on public site):
> <session-config>
> <session-timeout>10</session-timeout>
> </session-config>
>
> Thanks a lot for your help.
>
>
> --
> To unsubscribe, e-mail:
<ma...@jakarta.apache.org>
> For additional commands, e-mail:
<ma...@jakarta.apache.org>
>
>
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Re: Tomcat stability problem
Posted by "Jim D. Results" <jd...@resultstel.com>.
Could be the VM garbage collecting ?
How often does this happen ?
Jim D.
----- Original Message -----
From: "Ben Glorie" <be...@bricsnet.com>
To: <to...@jakarta.apache.org>
Sent: Friday, December 27, 2002 12:59 PM
Subject: Tomcat stability problem
> We're running Tomcat 4.1.12 on a dual-proc PIII with 512MB RAM. The
> application consists of 100,000+ HTML pages and approx. 100 jsp pages. We
> get approx. 60,000 page views per day. Performance is fine, but
occasionally
> the system runs into the following problem:
>
> - when you request a jsp page in the browser, there is a delay of 5-10
> seconds, then the page is loaded into the browser
> - even though the HTML code is complete and all images are visible, the
> browser still appears to be loading something ("load" bar is creeping)
> - then after approx. 30 seconds the loading stops (because of a page
> timeout?)
> - static HTML pages are not affected, they load as quickly as usual
>
> Although the problem seems to happen more frequently on busy days, it does
> not seem to be related to peak traffic: it has also happened at quiet
times,
> and sometimes within an hour after a Tomcat restart (up to 4 days after a
> restart). Does anybody have any ideas on what is happening and how we can
> solve it? Some configuration details:
>
> - catalina.sh:
> CATALINA_OPTS="-Xmx128M"
> (we've ordered more RAM, as soon as it has arrived we're planning to
change
> this to -Xmx512M
>
> - server.xml:
> <Connector className="org.apache.coyote.tomcat4.CoyoteConnector"
> port="80" minProcessors="10" maxProcessors="110"
> enableLookups="true" redirectPort="8443"
> acceptCount="10" debug="0" connectionTimeout="10000"
> useURIValidationHack="false" />
>
> - web.xml (on public site):
> <session-config>
> <session-timeout>10</session-timeout>
> </session-config>
>
> Thanks a lot for your help.
>
>
> --
> To unsubscribe, e-mail:
<ma...@jakarta.apache.org>
> For additional commands, e-mail:
<ma...@jakarta.apache.org>
>
>
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RE: Tomcat stability problem
Posted by Dan Payne <dp...@sotx.org>.
nevermind. i didn't RTFM close enough.
-----Original Message-----
From: Torsten Fohrer [mailto:TFohrer@t-online.de]
Sent: Friday, December 27, 2002 1:23 PM
To: Tomcat Users List
Subject: Re: Tomcat stability problem
a simply performance switche for tomcat/jsp pages is the
development init-param of jasper.
cu Torsten Fohrer
On Friday 27 December 2002 18:59, you wrote:
> We're running Tomcat 4.1.12 on a dual-proc PIII with 512MB RAM. The
> application consists of 100,000+ HTML pages and approx. 100 jsp pages. We
> get approx. 60,000 page views per day. Performance is fine, but
> occasionally the system runs into the following problem:
>
> - when you request a jsp page in the browser, there is a delay of 5-10
> seconds, then the page is loaded into the browser
> - even though the HTML code is complete and all images are visible, the
> browser still appears to be loading something ("load" bar is creeping)
> - then after approx. 30 seconds the loading stops (because of a page
> timeout?)
> - static HTML pages are not affected, they load as quickly as usual
>
> Although the problem seems to happen more frequently on busy days, it does
> not seem to be related to peak traffic: it has also happened at quiet
> times, and sometimes within an hour after a Tomcat restart (up to 4 days
> after a restart). Does anybody have any ideas on what is happening and how
> we can solve it? Some configuration details:
>
> - catalina.sh:
> CATALINA_OPTS="-Xmx128M"
> (we've ordered more RAM, as soon as it has arrived we're planning to
change
> this to -Xmx512M
>
> - server.xml:
> <Connector className="org.apache.coyote.tomcat4.CoyoteConnector"
> port="80" minProcessors="10" maxProcessors="110"
> enableLookups="true" redirectPort="8443"
> acceptCount="10" debug="0" connectionTimeout="10000"
> useURIValidationHack="false" />
>
> - web.xml (on public site):
> <session-config>
> <session-timeout>10</session-timeout>
> </session-config>
>
> Thanks a lot for your help.
>
>
> --
> To unsubscribe, e-mail:
> <ma...@jakarta.apache.org> For additional
> commands, e-mail: <ma...@jakarta.apache.org>
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Re: Tomcat stability problem
Posted by Torsten Fohrer <TF...@t-online.de>.
a simply performance switche for tomcat/jsp pages is the
development init-param of jasper.
cu Torsten Fohrer
On Friday 27 December 2002 18:59, you wrote:
> We're running Tomcat 4.1.12 on a dual-proc PIII with 512MB RAM. The
> application consists of 100,000+ HTML pages and approx. 100 jsp pages. We
> get approx. 60,000 page views per day. Performance is fine, but
> occasionally the system runs into the following problem:
>
> - when you request a jsp page in the browser, there is a delay of 5-10
> seconds, then the page is loaded into the browser
> - even though the HTML code is complete and all images are visible, the
> browser still appears to be loading something ("load" bar is creeping)
> - then after approx. 30 seconds the loading stops (because of a page
> timeout?)
> - static HTML pages are not affected, they load as quickly as usual
>
> Although the problem seems to happen more frequently on busy days, it does
> not seem to be related to peak traffic: it has also happened at quiet
> times, and sometimes within an hour after a Tomcat restart (up to 4 days
> after a restart). Does anybody have any ideas on what is happening and how
> we can solve it? Some configuration details:
>
> - catalina.sh:
> CATALINA_OPTS="-Xmx128M"
> (we've ordered more RAM, as soon as it has arrived we're planning to change
> this to -Xmx512M
>
> - server.xml:
> <Connector className="org.apache.coyote.tomcat4.CoyoteConnector"
> port="80" minProcessors="10" maxProcessors="110"
> enableLookups="true" redirectPort="8443"
> acceptCount="10" debug="0" connectionTimeout="10000"
> useURIValidationHack="false" />
>
> - web.xml (on public site):
> <session-config>
> <session-timeout>10</session-timeout>
> </session-config>
>
> Thanks a lot for your help.
>
>
> --
> To unsubscribe, e-mail:
> <ma...@jakarta.apache.org> For additional
> commands, e-mail: <ma...@jakarta.apache.org>
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Re: Tomcat stability problem
Posted by Julian Löffelhardt <ju...@austria.fm>.
Hi,
I'm using jdk 1.4.1 on redHat Linux, and -Xincgc didn't do that well.
I was experimenting with java gc settings and -Xincgc dropped my overall
performance about 75%.
Maybe it works better with other JVM/OS combinations but it seems that when
using linux one is best of with the -client VM and no fancy gc settings ( I
also think that the incremental garbage collector would be enabled by
default if it were any good)
Beside incrementig -Xmx and -Xms I had great succcess with -XX:PermSize
and -XX:MaxPermSize to resolve several memory issues I had when using to
many distinct JSP-pages.
llap,
julian
----- Original Message -----
From: "Ben Glorie" <be...@bricsnet.com>
To: "Tomcat Users List" <to...@jakarta.apache.org>
Sent: Saturday, December 28, 2002 6:33 PM
Subject: RE: Tomcat stability problem
> GC delay certainly sounds plausible, I'll try to set the -Xinccg option as
> suggested by Bill.
>
> We're running Linux 7.3 and Java 1.4.1_01. Is this combination also
> sensitive to SMP problems? If that would be the problem, what would I have
> to do?
>
> Thanks to you all for the suggestions so far, which have all been very
> helpful.
>
> -----Original Message-----
> From: Noel J. Bergman [mailto:noel@devtech.com]
> Sent: Saturday, December 28, 2002 5:38 AM
> To: Tomcat Users List
> Subject: RE: Tomcat stability problem
>
>
> > We're running Tomcat 4.1.12 on a dual-proc PIII with 512MB RAM.
>
> Which JVM and OS? You are running an SMP box. Sun JVM 1.4.0, for
example,
> was notorious for SMP issues on linux.
>
> --- Noel
>
>
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>
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>
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RE: Tomcat stability problem
Posted by Ben Glorie <be...@bricsnet.com>.
GC delay certainly sounds plausible, I'll try to set the -Xinccg option as
suggested by Bill.
We're running Linux 7.3 and Java 1.4.1_01. Is this combination also
sensitive to SMP problems? If that would be the problem, what would I have
to do?
Thanks to you all for the suggestions so far, which have all been very
helpful.
-----Original Message-----
From: Noel J. Bergman [mailto:noel@devtech.com]
Sent: Saturday, December 28, 2002 5:38 AM
To: Tomcat Users List
Subject: RE: Tomcat stability problem
> We're running Tomcat 4.1.12 on a dual-proc PIII with 512MB RAM.
Which JVM and OS? You are running an SMP box. Sun JVM 1.4.0, for example,
was notorious for SMP issues on linux.
--- Noel
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RE: Tomcat stability problem
Posted by "Noel J. Bergman" <no...@devtech.com>.
> We're running Tomcat 4.1.12 on a dual-proc PIII with 512MB RAM.
Which JVM and OS? You are running an SMP box. Sun JVM 1.4.0, for example,
was notorious for SMP issues on linux.
--- Noel
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