3. PERFORMANCE ANALYSIS TOOLS › 3.1 Batch Initiator Simulation › 3.1.1 Functional Description

3.1.1 Functional Description

The Batch Initiator Simulation inquiry provided by the CA
MICS Performance Manager Option allows you to evaluate the
effect of modifying the job class or initiator structure for
your workload.  In particular, the inquiry can be applied to
the data in the DETAIL timespan of the CA MICS BATJOB and
BAT_JS Files.  The inquiry evaluates the initiator
utilization and the input queue time of the selected jobs
under the proposed initiator structure.

NOTE:  The Batch Initiator Simulation inquiry is not
appropriate for JES3 workloads.  You should use it only for
JES2 workloads.


The inquiry is implemented as a discrete simulation.  This
offers several advantages over a queuing model approach to
the problem.  Principal among these is the fact that the
inquiry need not make any assumption about arrival rates (for
example, arrival rates need not be uniform).  Other
simplifying assumptions made for the purpose of the inquiry
are discussed in Section 3.1.2.

The Batch Initiator Simulation inquiry produces the following
decision support reports:

    o  Initiator Busy Report - Shows the number of jobs
       processed by each initiator and the percent of time
       that the initiator was occupied.  If the initiator
       serves multiple classes, figures are provided by class
       and for the entire initiator.

    o  Job Queue Size Report - Provides queue statistics for
       each reporting interval of the simulation.  The
       maximum queue length, queue length at the end of the
       interval, and the number of arrivals is provided for
       each class.
    o  Job Input Queue Time Report - Consists of a plot for
       each class.  Each plot presents a comparison of the
       actual and simulated queue times for jobs in that
       class.

    o  Job Class Throughput Report - Presents a comparison of
       actual and simulated throughput for reporting periods.
       Average queue times are also provided, and all figures
       are broken down by job class.

These reports are described in greater detail in Section
3.1.3.