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From "Kevin Williams" <>
Subject RE: tomcat CPU utilization CPU only 50%
Date Wed, 02 Feb 2005 06:47:34 GMT

My client has installed two instances of tomcat (each as a service).
I'm not really sure how they did it (they have the standard C:/Program
Files/Apache Group/Tomcat 4.1 folder, but the apps and conf files are in
D:/instances/instance1/conf, D:/instances/instance1/app,
D:/instances/instance1/work, D:/instances/instance1/log).  I'll talk to
the guy who configured this so I can emulate one of the instances in
batch mode.  I'll let you know how it goes after I make the changes!


-----Original Message-----
From: Caldarale, Charles R [] 
Sent: Tuesday, February 01, 2005 10:00 PM
To: Tomcat Users List
Subject: RE: tomcat CPU utilization CPU only 50%
Importance: Low

> From: Kevin Williams []
> Subject: RE: tomcat CPU utilization CPU only 50%
> 1.  Yes, tomcat is running as a service.

You might want to shutdown that service and run it from a command-line
window, at least for testing purposes.  Easier to fiddle with heap size
options and the like.

> 2.  I am not aware of any CPU affinity settings.

They won't show up in Task Manager.  Not sure if the plain Windows
Server supports affinity; my experience with that capability was on a
32-CPU Advanced (Enterprise?) Server system which I no longer have
access to.  There's an mmc plug in Admin Tools that lets you play with
associating processes with CPUs, if it's available in your OS.

> 3.  I'm not sure what options are set with the jvm (I didn't 
> install the service).

IIRC, the default heap size for the 1.4.1 JVM on Windows is only 64 MB,
and that's really not enough for any serious work.  I suspect that
you're spending much of your time in garbage collection.

 - Chuck

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