2.7.1.7 Workload Velocity and CPU Activity

2. PERFORMANCE REPORTING ANALYSIS › 2.7 Graphic Analysis › 2.7.1 CPU Graphs › 2.7.1.7 Workload Velocity and CPU Activity

2.7.1.7 Workload Velocity and CPU Activity


GRAPHIC RESULTS

The Workload Velocity and CPU Activity Graph provides a
snapshot of the performance of workloads that have been
defined with service goal type (WLMGOLTP) of "Execution of
Velocity".  The Goal (WLMGOLVE) and actual velocity
(SECEXVEL) is expressed as a percentage. Actual velocity is a
measure of how fast the transactions with this goal type are
running.  Work that is "not ready" is not included in this
percentage.  The CPU utilization, expressed as a percentage,
is available for interval comparisons with the given
workload.

ANALYSIS GUIDELINES

The reports provide a method to verify WLM execution goal
success. The user may note that systems which are running CPU
constrained during certain hours of the day may be unable to
achieve their WLM Goal. This report will identify the
constrained/peak hours.


SPECIAL CONSIDERATIONS

CPU is just one component of performance and some factors
impact each other (i.e., I/O affects CPU utilization). Some
factors to consider are: I/O wait (including data set
contention), coupling facility wait, tape mount wait (rewind
time, SILO robot response, computer operator mount wait) and
I/O error recovery.  To understand fully the performance of
workloads, all contributing factors must be accounted for and
understood.

Figure 2-199 provides an example of the Workload Velocity and
CPU line graph.

WLM Execution Velocity Performance ------------------------------------ Date=Mon, Apr 13, 98 SYSID=XAD1 Workload Name=BATCH ------------------------------------ Plot of CPUPCBSY*HOUR. Symbol used is 'C'. ---+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--- 100% + C C C C + | C C C C C C C | C | C C C C C | P 80% + C C C C + U | C C C | | C | P 60% + + e | | r | | c 40% + + e | | n | | t 20% + + | | | | 0% + + ---+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--- 0 2 4 6 8 10 12 14 16 18 20 22 24 Hour Plot of SECEXVEL*HOUR. Symbol used is 'A'. Plot of WLMGOLVE*HOUR. Symbol used is '*'. ---+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--- E | | x | | e 100% + + c | | 80% + + V | | e 60% + A A A * * * * * * * * * A A + l | A A A A | o 40% + A A * * * A + c | * * * * * A A | i 20% + A + t | A A A A A * A A * * * * * | y 0% + A * A + | | ---+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--- 0 2 4 6 8 10 12 14 16 18 20 22 24 Hour

 Figure 2-199. Sample Workload Velocity and CPU Activity Graph