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  2. JAVA400-L
  3. May 2014

Re: Tomcat performance degrades when moved to its own subsystem. Any insights?

On 5/23/14 11:16 AM, Jim Oberholtzer wrote:
A) How much memory did they give it, B) what was the activity level set for
that pool? Both can have a very adverse effect on a heavily threaded job
like Tomcat if they are too low.

Also the private pool vs. a shared pool. That memory can be in the same
shared pool as all the other HTTP servers since the paging characteristics
are going to be very similar.

I suspect a poor implementation of the concept.

Hmm. The instructions we gave said to give the pool at least as much space as the maximum heap specified for Tomcat. We have Tomcat defaulting to 2048, in megabytes, and our experimental Tomcat subsystem, accordingly, is set to 2097159, in kilobytes.

The customer in question had the pool on their subsystem 768 kilobytes.

I think we may have the reason why everything went crazy as soon as they tried to launch.

--
JHHL



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