Look at KB Document Number: 349033974 "Separating Batch Work from
*BASE
http://www-912.ibm.com/s_dir/slkbase.nsf/1ac66549a21402188625680b0002037
e/9fa68bd7573e48af862565c2007d3d9b
Make sure that the system value QPFRADJ is set to 2 or 3 and Paging
Option for all pools except pool 1 is set to *CALC.
Create a shared pool and assign all your application jobs to run in that
one. Depending on what else you are running you may want to assign
memory intensive jobs like WebSphere or Domino server jobs to the shared
pool as well.
Track your changes and the results, so you know what is effective in
your environment.
Watch what QPFRADJ does to your pools. This will give you a better idea
of where your system "wants" to use the memory. Once you have a good
idea of the highs and lows you can use WRKSHRPOOL to better control how
QPFRADJ moves the memory. Your java jobs may run considerably better if
you "pin" a certain amount of memory to your shared pool.
Regards,
Scott Ingvaldson
Senior IBM Support Specialist
Midwest Region Data Center
Fiserv.
-----Original Message-----
From: Josh Diggs [mailto:JDiggs@xxxxxxxxxxxx]
Sent: Friday, March 26, 2010 9:03 AM
To: 'midrange-l@xxxxxxxxxxxx'
Subject: Performance tuning memory pools
We are seeing very slow response on jobs that run out of the *Base
memory pool. These are java jobs that are part of our ERP package.
From looking at wrksyssts it appears that a good part of the problem may
be excessive paging. When the system is under full load we are seeing
an average of a little less then 100 DB faults and about 150 Non-DB
faults per second.
I don't have any training in this area, but the obvious problem is that
we simply don't have enough memory to accommodate the load we are
putting on the server. Is there a chance that we simply have the max
active field set too low because we have a large number of relatively
small memory footprint jobs running? How would I test that hypothesis?
I can narrow down the jobs for which I would most like to increase
performance to one subsystem. Is it fairly straightforward to define a
user memory pool constrained for use to that one subsystem?
Thanks for any advice.
Josh Diggs
Information Systems Manager
California Fine Wire
midrange.com
