2. PERFORMANCE REPORTING ANALYSIS › 2.7 Graphic Analysis › 2.7.1 CPU Graphs

2.7.1 CPU Graphs

In managing performance, it is important to understand and
track two very basic types of information about your
processors: how busy they are and what workloads are using
these resources. z/OS systems should be able to operate
effectively at very high processor utilization, assuming no
other system resource is limiting critical response time.
You need to know which z/OS service classes and workloads
account for the majority of this utilization.

These utilization values cannot be viewed in isolation. If
utilization is high but no workloads spend time waiting for a
processor, and workloads are experiencing acceptable online
response time or batch turnaround time, there may be no need
for further diagnosis and corrective action. The use of other
indicators along with CPU busy can help you determine whether
there is a processor utilization problem or some other form
of workload delay.

This section discusses the following graphic analyses:

    1 - CPU Busy by Hour and Day
    2 - CPU Busy by Service Class
    3 - CPU Busy and Other Indicators
    4 - CPU Busy by Workload Type - Pie Chart
    5 - CPU Busy by System
    6 - CPU Busy by Workload Type - Bar Chart
    7 - Workload Velocity and CPU Activity