How to Monitor zIIP Utilization for a Service Class

Performance › Exploitation of the zIIP Specialty Processor › How to Monitor zIIP Utilization for a Service Class

How to Monitor zIIP Utilization for a Service Class

Usage of the zIIP specialty processor should be planned and monitored through the IBM Resource Management Facility (RMF) Service Class report (WLMGL). This report is based on data taken from the following SMF Record Types:

SMF Record Type 72 (x48) RMF Workload Activity and Storage Data
SMF Record Type 79 (x4F) RMF Monitor II Activity

The Service Class report provides information to your capacity planner to determine how much zIIP capacity is needed. zIIP utilization will be reported for the SVTSCE.SVTnVn address spaces only.

When viewing the RMF Service Class report fields; CP, IIP, and IIPCP in the APPL % column are most important:

CP: Represents the percentage of work run on a general CP.
IIP: Represents the percentage of work run on a zIIP processor.
IIPCP: Represents the percentage of work eligible for the zIIP processor that WLM redirected to the general processor.

If the zIIP Exploitation feature is activated, you should see a percentage of work in the IIP field. When zIIP processors are online and CA Vtape is exploiting them you may see some reported in the IIPCP field. It represents the percentage of work that was enabled to run on the zIIP engine, but was redirected by WLM to the general CP.

You can perform capacity planning activities before you have zIIP processors installed or online by running with zIIPExploitation=Y and PercentRunOnZIIP=100. CA Vtape will enable its work for the zIIP engine and RMF will report that work in the IIPCP column. If IIPCP is >= 100% that means more than one zIIP processor would be needed for the work that was zIIP enabled. If IIPCP is >= 100% that means more than one zIIP processor would be needed.