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From Andrew Bruno <>
Subject Re: Setting the Right Amount of Memory
Date Wed, 16 Jun 2010 22:55:47 GMT
Hi Eric,

Just wondering, what tools do you use to manage all the instances?
Also, what do you use to look for the OutOfMemory in logs?  I am
looking at Splunk too.


On Thu, Jun 17, 2010 at 12:42 AM, Robinson, Eric
<> wrote:
> We run 150+ instances of tomcat on one server. To optimize memory
> utilization, each tomcat instance is configured with 64MB by default
> (export JAVA_OPTS="-ms64M -mx64M"). We then watch for
> Java.Lang.OutOfmemory errors in the logs. If we see any of these over
> time, we allocate additional RAM in 32MB increments until that instance
> stops throwing errors. Most instances are happy with 64MB. Some need
> 96MB or 128MB. We have never seen a tomcat instance that throws
> OutOfMemory errors with 256MB RAM.
> If tomcat is not throwing OutOfMemory errors and system responsiveness
> is good, is there really any reason to allocate higher amounts of RAM?
> --
> Eric Robinson
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