|
Just a few thoughts: - subsystems and pools are designed to isolate workloads and provide for separate control over each individual workload type. If you think that your workload cannot be subdivided into distinct types and/or you do not want to isolate these workloads, then you can live with just two pools - *MACHINE pool for system purposes and *BASE for the rest. - basic cycle for QPFRADJ is 20 seconds. It needs at least a couple of cycles to see the pattern of use and take an action. I do not think that QPFRADJ can take any action in "very few seconds". - storage for the pool is allocated when the first subsystem which uses the pool, starts. If *SHRPOOL1 had significant storage size configured for it, and then you started a subsystem in *SHRPOOL1, the pool will have storage allocated to it all at once. This indeed can happen very quickly. - QPFRADJ treatment of different pools is determined by pool tuning attributes (basically second page in WRKSHRPOOL). The further pool is from its target, the more aggressive QPFRADJ will be. Alexei always speaking for myself rob@dekko.com Sent by: To: Midrange Systems Technical Discussion midrange-l-bounces@m <midrange-l@midrange.com> idrange.com cc: Subject: Why not *SHRPOOL1? 01/27/2003 08:10 AM Please respond to Midrange Systems Technical Discussion On our 840 12-way we have system value QPFRADJ set to "2=Adjustment at IPL and automatic adjustment". And we have the following pools: System Pool Reserved Max Pool Size (M) Size (M) Active Pool 1 2618.98 655.60 +++++ *MACHINE 2 6307.05 55.12 530 *BASE 3 3935.35 <.01 80 *SHRPOOL1 4 303.44 .00 20 *SPOOL 5 1835.15 .20 227 *INTERACT Actually, this does a pretty good job. However, if you start this big whopping job in one subsystem, or the other, then it takes awhile until QPFRADJ switches memory over. In the Rochester lab (just last week) we had a Query take 3 minutes until we switched QINTER to run in *SHRPOOL1. They were still scratching their heads to figure out how often QPFRADJ adjusts. After the switch it took only a very few seconds. So now my boss asked me a good question. Why don't we just use two pools: *MACHINE and *SHRPOOL1? And avoid that time lag of QPFRADJ. Questions and comments appreciated. Rob Berendt -- "They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." Benjamin Franklin _______________________________________________ This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list To post a message email: MIDRANGE-L@midrange.com To subscribe, unsubscribe, or change list options, visit: http://lists.midrange.com/mailman/listinfo.cgi/midrange-l or email: MIDRANGE-L-request@midrange.com Before posting, please take a moment to review the archives at http://archive.midrange.com/midrange-l.
As an Amazon Associate we earn from qualifying purchases.
This mailing list archive is Copyright 1997-2024 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].
Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.