Allan, I'm interested in your statement about DB2 being managed at the transaction level (usually). As far as I know DB2 is not transaction managed the way CICS or IMS is. DB2/DDF does do its processing via enclaves, but that is different from the type of transaction processing that is done for CICS and IMS. I expect that most shops set up their DDF first period with a response time goal, but you can also set up a batch service class period with a response time goal, and that certainly isn't transaction type management.
Tom Kelman Enterprise Capacity Planner Commerce Bank of Kansas City (816) 760-7632 > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On > Behalf Of Staller, Allan > Sent: Friday, January 15, 2010 1:38 PM > To: IBM-MAIN@bama.ua.edu > Subject: Re: WLM BATCH rules > > <snip> > This can't be right. Adjustments to goals / DPs are made every 10 > seconds. > Could you imagine if online systems in different service classes with > the same importance behaved this way? For example, CICSPROD with > IMP=2 and DB2PROD with IMP=2. > </snip> > > 1) Generally (unless you are really really huge) CICS/DB2 are at the top > of the CPU food chain and will *NEVER* perceive 100% utilization. I.E. > to those address spaces, the CPU is *NEVER* 100% busy. There is adequate > CPU for all. > > 2) Both CICS and DB2 (usually) are monitored for performance at the > transaction level, not the address space level > > The workloads I discussed are 2 separate batch service classes (one for > WLM inits and one for JES inits). They are behind the onlines, and thus > *CAN* perceive 100% busy. Either can consume 100 percent of the > available CPU (after the loved ones are taken care of). > > Actually during some of the early investigation, I had WLM L2 look at > what was going on at the 10 sec level via a dump of the WLM address > space. According to WLM L2, it took that long for enough delay samples > to accumulate and convince WLM to make an adjustment. This was not shown > by RMF II or RMF III. > > They made a suggestion to increase the performance objective to make WLM > more responsive. I.E. MPL/DP adjustment made sooner rather than later. > > This has lead to more periods of "continuous distribution" and fewer of > "alternating distribution". However, I have not been able to completely > eliminate the "alternating distribution" phenomenon. > > This has been explained to my satisfaction and I feel this is an > artifact of my particular workloads. I do concur with Ted, that the > design choice made then may have been less than optimal but I have to > live with it and get my work done. > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO > Search the archives at http://bama.ua.edu/archives/ibm-main.html ***************************************************************************** If you wish to communicate securely with Commerce Bank and its affiliates, you must log into your account under Online Services at http://www.commercebank.com or use the Commerce Bank Secure Email Message Center at https://securemail.commercebank.com NOTICE: This electronic mail message and any attached files are confidential. The information is exclusively for the use of the individual or entity intended as the recipient. If you are not the intended recipient, any use, copying, printing, reviewing, retention, disclosure, distribution or forwarding of the message or any attached file is not authorized and is strictly prohibited. If you have received this electronic mail message in error, please advise the sender by reply electronic mail immediately and permanently delete the original transmission, any attachments and any copies of this message from your computer system. ***************************************************************************** ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
