2. PERFORMANCE REPORTING ANALYSIS › 2.7 Graphic Analysis › 2.7.3 TSO Service Graphs › 2.7.3.1 TSO First Period Response

2.7.3.1 TSO First Period Response

GRAPHIC RESULTS

This graphic analysis provides a line plot of TSO first
period response time.

ANALYSIS GUIDELINES

This plot shows first period TSO response time for each day,
week, or month for which data is available.

At the DAYS level of summarization, you should look for
consistency.  For any day that showed unusual degradation of
response time, you should determine whether this was due to a
periodic peak load that must be planned for in the future, or
whether it was due to some system problem or unusual load
that is unlikely to occur frequently.

At higher summarization levels, especially when using the
MONTHS level timespan, you can look for trends.  If response
time is gradually being degraded, you may need to analyze
more recent daily TSO response times to look for peaks during
the day.  You can then use other Performance Manager graphic
analyses and reports to search for possible causes for this
degradation.

Tracking first period and non-first period TSO response times
separately is important because they do not represent the
same type of work.  First period TSO responses tend to have
relatively uniform and small resource requirements, because
the SRM or Workload Manager (in the case of systems operating
in "goal mode") forces transactions that are heavy resource
consumers into subsequent periods.  If first period TSO
response experiences irregular response times, it is
generally due to system load or a system-wide problem.

The overall complex of TSO periods can experience variable
response times due to variability of resource usage by some
TSO transactions.  Tracking overall TSO response time is
available with the graph discussed in Section 2.7.3.2.

The detailed behavior of TSO workloads and the system
influences that may be affecting them can be further analyzed
using the Installation Performance Specification analysis
reports and the sysplex analysis reports described in Section
2.8.

SPECIAL CONSIDERATIONS

For systems still utilizing performance groups, you do not
need to specify the performance groups that constitute TSO to
produce either the plot of TSO first period response time or
the plot of overall complex TSO response time.  Your TSO
performance groups will automatically be chosen for these
graphs.  However, if you have several performance groups that
constitute TSO but have different service level objectives,
are they managed differently by the SRM, or do they tend to
have markedly different resource requirements?  You may use
the performance group selection capability found on the main
selection screen for either graphic analysis to determine
which performance group will be included in a plot.

For systems operating in goal mode, the analysis attempts to
determine TSO service classes/periods by searching for the
characters "TSO" in either the service class name or the
service definition name.  If your TSO service classes follow
the convention of incorporating TSO in the class name or
definition name, the analysis will automatically choose those
classes for reporting.  Alternatively, you can use the
service class selection capability found on the main
selection screen of both analyses to determine which service
classes will be included in a plot.