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.
--
Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects
-----Original Message-----
From: JAVA400-L [mailto:java400-l-bounces@xxxxxxxxxxxx] On Behalf Of James
H. H. Lampert
Sent: Friday, May 23, 2014 12:18 PM
To: Java 400 List
Subject: Tomcat performance degrades when moved to its own subsystem. Any
insights?
We just had a report, from one of our customers, of a case in which moving a
Tomcat server into its own subsystem caused performance to degrade instead
of improve.
On starting the server in the subsystem, CPU utilization jumped to over 30%,
and it evidently was balky in serving the sign-on page for our webapp. On
returning the Tomcat server to its previous subsystem, everything returned
to what it was before.
From the instructions we gave the customer:
CRTSBSD SBSD(<name>) POOLS((1 *BASE) (2 <size of private memory pool
in
kilobytes> 200))
The size should be the same as the maximum heap specified on the
STRTOMCAT, or a bit larger, but remember, this is in kilobytes, while
the STRTOMCAT command expects megabytes, so multiply by 1024. The
activity level of 200 should allow for plenty of threads, but it can be
increased as needed.
At this time, we don't know how big of a private memory pool they actually
gave the subsystem.
--
JHHL
--
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