On Tue, 17 Feb 2009 16:19:29 -0600, Field, Alan C. wrote: >We've tried to manage the number of inits manually to balance the >utilization but it's not easy. > >We're wondering about WLM inits for this class. Early experience with >WLM inits wasn't positive.
I had great results with WLM initiators when I went to OS/390 2.4. I think it might have helped that all of my batch goals were response time goals. I made sure that none of my goals were too aggressive and for batch I used fairly low percentiles on my response time goals. At the time of the upgrade to 2.4, we were very far back level and were running at 100% all day. CICS response times were starting to suffer before going to 2.4 and goal mode. After the upgrade, we found that there were usually fewer initiatirs running and everything ran better, including test batch work. I'm not at that shop any more and am no longer doing WLM work as part of my regular responsibilities, so I can't give details. I did post them way back then so you could check the archives. This is what I remember. For our test job class, I had a goal of 50% complete in under 5 minutes. I had determined ahead of time that it was an easy goal to meet. For our production job classes I had a goal of something like 50% complete in less than 30 minutes. We did have a number of production jobs that ran for a lot longer than 30 minutes, but there were always enough fast running jobs in the system so that WLM was able to meet the goal. We had only one job class that couldn't use WLM initiators because of some automation that started and stopped the initiator and sometimes inserted a restore job to recover from abends. We tried to change the automation to set the maximum number of jobs in that class to zero and back to one rather than stop and start the init. It worked ok, but was too slow, so we put that job class back under JES control. You will find that with WLM managed inits, you can't see the initiators in an SDSF INIT display. You can, however see a lot of useful information in a JC display. Also, with WLM inits, when there is a job that needs to start now, you can simply use $S jobname. Of course, YMMV. -- Tom Marchant ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
