> Anyway, I decided to define a resource group with just 100 SUs to force >batch down. Surprisingly batch still used up to 2000 SUs, because WLM >promoted the batch workload due to any blockings, enqueues or locks batch >held. So promotion by WLM might be another reason at your site that batch >runs better than expected. >You can verify this with the Workload Activity report, it includes a >column "Service" and "Promoted".
Hmm, did you verify that 2000 SU/sec were in fact used at a promoted dispatch priority? A z196 model 7xx (just as a typical example) delivers between 33,000 and 61,000 SU/sec per processor. Resource groups work by marking the work dispatchable/non-dispatchable for multiples of 1/64th of the time. Therefore, a single logical CP could deliver between roughly 500 and 950 SU/sec. Depending on the type of resource group, the number of logical processors within the scope of your resource group (i.e. system or Sysplex), and the amount of work running at a higher priority you may well end up at that order of magnitude for the achievable granularity for *that* resource group in your environment. Horst Sinram - IBM z/OS Workload Management ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
