GPA Manual

Description of GPA Reports
Guardian Performance Analyzer (GPA) Manual—135081
3-6
System Performance Summary
System Performance Score
This subsection of the report (Example 3-4) rates the performance of the node and its
subsystems from 0 to 100%, with a score of 100% being best. Note that these scores are
not absolute values. They merely indicate the quality of performance of the subsystems
and show which of the subsystems might profit from corresponding tuning changes.
The system recovery performance score indicates how well the system would be able to
continue performing if any of the processors were to fail.
The weighted analysis system score is a weighted average of the subsystem scores. If
GPA finds that either the CPU or memory subsystems have a performance score of 1%
or less, it assigns a value of 1%. In these cases, the weighted analysis system score is set
to 1% also.
The individual scores are detailed in The Detail System Performance Score Reports
in
Section 4, Using GPA Information.
(6) CACHE FAULT DETECTED: No cache faults detected. A cache fault
occurs when a disk process expects to find a data block in cache and discovers
that the memory manager has removed it. The memory manager does this
whenever it needs the extra storage space to relieve a shortage of main
memory.
(7) OVER UTILIZED CPU: No overutilization of any processors. None of the
percentage busy times for the CPUs on the node was found to be excessive.
(8) TRANSIENT PROCESSING: No excessive transient processing. The
number of dynamic PCBs on the node (see Example 3-1
) is not excessive.
(9) DISK VOLUME QUEUING: Excessive disk volume queuing. The request
queue time for one or more disk volumes on the node is too high.
(10) BLOCKED REQUESTS: No blocked requests. A blocked request is one that
cannot be processed because another application has blocked access to a
record, row, table, or file.
(11) AVERAGE CACHE HIT %: Average cache hit percentage of 83.20. The
average cache hit percentage is an average of the cache hit percentages of all
the volumes on the system. It is an indication of how well the current cache
settings are performing.
(12) TOTAL CACHE CALL RATE: Total cache call rate of 25.00 per second.
The cache call rate indicates the degree of disk activity on the node.