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Evaluate Performance Using the Investigate Displays
Isolate the Cause of a CPU Limitation
If an examination of the system overview reveals a CPU limitation, you can
investigate the cause of the limitation in more detail using the CPU display.
The following illustration is an example of the CPU display:
Examine the following CPU display indicators:
Any available CPU
Look at the Idl bar (CPU Idle time) in the CPU mode bars in the middle of
the CPU display. If there is no idle time, the CPU is a bottleneck.
A few processes blocking other processes
The blocking high-priority process might be: running an inefficient
program, acting as a server, or acting as a process with which other
processes must communicate.
Look at the Priority bars for high-priority, active processes, or at the
Process bars for high-priority processes with a high CPU time percentage.
Corrective action might include changing process priorities in the user
authorization file, defining priorities in the user login command file, or
changing the priorities of processes while they execute.
Lost CPU time
Look at Page wait, Swap wait, and Pg+Swp Wt. CPU time might be lost
because the CPU has to wait for disk transfers, or page or swap I/O to
complete.
A high value of Pg+Swp Wt is cause for concern. It indicates a memory
problem resulting in a CPU limitation.
400 Performance Manager Administrator Guide