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From Pieter Temmerman <ptemmerman....@sadiel.es>
Subject Re: [Tomcat] [daemon] java.lang.OutOfMemoryError unable to create new native thread
Date Tue, 03 Feb 2009 15:45:47 GMT
Hi Steve,

Some great tools to monitor your Tomcat installations are:

- Jconsole (make sure you get the topthreads plugin)
- VisualVM
- VisualGC
- Jmap

Hope that helps.

On Tue, 2009-02-03 at 09:31 -0600, Steve Cohen wrote:
> We have an application that runs under Tomcat under RHEL 5.0  and is 
> launched by a jsvc daemon.
> It chugs along seemingly fine on several servers, yet yesterday crashed 
> on one of them with the above exception seemingly without experiencing 
> any kind of abnormal load.  I am trying to get a handle on this.
> System is
> 
> $ uname -a
> Linux  2.6.18-92.1.22.el5 #1 SMP Fri Dec 5 09:29:46 EST 2008 i686 i686 
> i386 GNU/Linux
> 
> Java version:
> java -version
> java version "1.5.0_16"
> Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_16-b02)
> Java HotSpot(TM) Client VM (build 1.5.0_16-b02, mixed mode, sharing)
> 
> no special JVM memory settings are used when launching tomcat, just the 
> default memory allocations.  I have read in some places that this 
> particular form of OutOfMemoryError is actually made worse by increasing 
> the memory size.
> 
> I need to deploy some thread and memory monitoring setup to get a handle 
> on this.
> 
> Can someone suggest a path forward here?
> 
> Thanks.
> 
> 
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-- 
Pieter Temmerman
email: ptemmerman.ext@sadiel.es
skype: ptemmerman.sadiel

SADIEL TECNOLOGÍAS DE LA INFORMACIÓN, S.A. http://www.sadiel.es.




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