GPA Manual

Using GPA Information
Guardian Performance Analyzer (GPA) Manual—135081
4-10
Processor Load Balance and Performance Charts
could be corrected by redistributing the disk processes among the CPUs.) Note that for
\NODEC (Example 4-19), the imbalance is severe enough that GPA makes a
recommendation for primary disk process changes and generates “After Primary
Changes” sections in its standard report.
Other important parameter values shown in this chart are:
•
The page swap rate (SWAP RATE). As mentioned previously under System
Performance Summary, a page swap rate greater than 1 indicates a memory shortage
or overutilization of the CPU.
•
The number of pages of memory owned by the memory manager. Refer to your
SYSGEN output and note that at the end of each processor section are listed the
number of pages locked and the minimum pages. Before any processes are added to
a processor, the number of memory manager pages should be reduced by the
minimum pages value and the swap rate of the processor should be reviewed. If
either the current swap rate is greater than 0.25 or the adjusted page number value is
less than about 200, no additional processes should be added without adding
physical memory.
•
The message rate (MSG RATE) and the dispatch rate (DISP/SEC). Generally, there
are at least two dispatches associated with either a send or a receive message.
The last line item on the chart gives the halt impact for each processor, the effect on
system performance if the processor were to fail. Example 4-12
shows that failure of any
one of the CPUs on \NODEA might have serious consequences. The term MEMORY
here means that failure of the CPU could result in a memory shortage in one or more of
the other processors which, in turn, could substantially degrade the system’s
performance.