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From Asim Alp <>
Subject Re: OutOfMemory Errors
Date Mon, 13 Dec 2004 18:31:50 GMT
Hello Peter,

Sorry.  My system config is:

Windows Server 2003
Apache 2.0.49 (Win32) mod_ssl/2.0.51 OpenSSL/0.9.7d DAV/2 mod_jk/1.2.6
Tomcat 5.5.4
sun jdk 1.5.0-b64

We have a 2 node tomcat cluster each running with the -Xms128m
-Xmx1024m options.

We have a heavily loaded JDBC application running and our MySQL server
has enough max_connections to handle our load.  For now, we have
Apache, one of the Tomcats and MySQL running on the same machine (2 x
3.8 Ghz Intel with 2GB of Ram).  We're also using this server as a
file server with RAID 5.

>From Task Managers performance monitor, I'm looking at the Handles (I
hope I'm looking at the correct thing).  Total number of handles is
around 30400 (almost two times 16K).  Apache is usually using about
3000, Tomcat 5000, MySQL 9000, System 2600, svchost 1000.

Do these values look normal?


On Mon, 13 Dec 2004 17:53:35 -0000, Peter Crowther
<> wrote:
> > From: Asim Alp []
> > I'm trying to solve an OOME on our Tomcat.
> Tomcat version?
> JVM version and settings?
> Application characteristics?
> Other libraries in use (eg JDBC)?
> > We profiled our
> > application using JProfiler and there are no memory leakages on our
> > end.  Currently, I'm focusing on some system resource problems such as
> > file descriptors.  Would this be a valid problem on Windows Server
> > 2003?  And if so, how can I change the max number of file descriptors?
> I suspect someone else will give a better Java solution, but I'm a
> Windows hack who's a relative latecomer to Java...
> You've got 16k to go at by default.  How many are you using, according
> to Performance Monitor?  And how many in the JVM running Tomcat?
> > One last thing...  What other resources should I investigate for this
> > sort of OOME?
> for 'handle' and Process Explorer if you
> suspect a resource problem on Windows.
>                 - Peter
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