Analyzing who is using the processor

When you determine that there is contention for the processor, you must determine which workloads are using it. The MVSPM CPU Busy by Workload Types, Hourly Trend report shows the percent of the system used by each workload type.

The values in this report are normalized to the percent of system so you can compare this report to the MVSPM Total CPU Busy report. Looking at processor busy by hour by workload type shows the different processor workload patterns. Work is dispatched to the processors based on a priority scheme. When the processor usage runs close to 100%, the lowest-priority work waits. You must understand how long this work can wait before service-level objectives are missed. Operating the system close to maximum capacity requires more careful management to ensure that all business needs are achieved.

A specific workload type often consists of multiple performance groups. The MVSPM CPU Busy by Workload Performance Group Numbers (PGNs), Hourly Trend report shows how much processor time is used by each performance group.

High processor busy for a performance group may indicate performance or capacity contention. Find out if one address space is causing this busy or if multiple address spaces are causing it. This detail will help you understand whether you need faster or more processors. When the processor capacity exceeds the available processor speed, the next step may be to split or clone an application.