Environment is: - 6 * z13 model 712 - some 10 z/OS LPARs on each CEC - overall LCP to PCP ratio ~ 4- 12-way production sysplex has two 12 LCP LPARs on each CEC
- prod LPARs have a ~38% share based on their weight => 4 vertical high and 1 vertical medium CPs - Neither CEC nor prod LPARs re overly busy (RMF shows some 40% - 60%) - CPU Activity Report shows Job in question is DB2 reorg utlility job which runs some 30 subtasks in parallel runs for 2 hours. RMF III (60s intervals) shows that the job mostly has a good workflow (80%+), is heavily using CP (often 80%-90%) and at the same time is heavily delayed for CP (40%-60%). The job is seen to use up to 230% CP. Question I've been asked: Would the job run even faster, if it was moved to a higher goal, higher importance service class. I understand that with HiperDispach=YES, WLM will assign work to the CP nodes it bulids, so the tasks will be dispatched on the same small set of LCPs, which (for the vertical high CPs) will always be dispatched on the same PCPs. Question: Is the assignment to dispatcher nodes by address space? In other words, would the 30+ subtasks of the reorg job all be assigned to the same node? Is so, the job would not be able to run more CPs in parallel at any point in time than there are LCPs in the node (highds, mediums, and unparked lows), right? Any thoughts? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
