2. PERFORMANCE REPORTING ANALYSIS › 2.7 Graphic Analysis › 2.7.1 CPU Graphs › 2.7.1.5 CPU Busy by System

2.7.1.5 CPU Busy by System

GRAPHIC RESULTS

This graphic analysis provides a multiline plot of CPU busy,
plotted over time, with each line representing data from a
different system (SYSID).

ANALYSIS GUIDELINES

This plot shows you CPU busy information for a specific time
period (day, week, month, etc.)  for multiple systems.  You
should look here to ensure that the data being analyzed is
both repeatable and consistent.  From this graph, you can see
whether you are analyzing a typical time period, a peak load
period (for example, prime shift weekdays) that is to be
expected with some regularity, or an unusual occurrence that
might be repeated only very rarely.

Notice the CPU busy patterns throughout a day, especially
contrasting one system with another.  When analyzing
performance, it is important to know the characteristic times
of peak loads during the day by system.  These patterns also
allow you to readily see when there are CPU resources
available.  If you know the major workloads that run on each
processor, you may be able to determine when these workloads
are most significant to overall utilization, and also how
workloads might be shifted from one system to another.

The detailed behavior of workloads and the system influences
that may be affecting them can be further analyzed.