3. PERFORMANCE ANALYSIS TOOLS › 3.1 Batch Initiator Simulation › 3.1.6 Component Operation › 3.1.6.2 Extended Options Menu › 3.1.6.2.9 Specify Simulation Clock Step Value
3.1.6.2.9 Specify Simulation Clock Step Value
If you enter Y (Yes) in the Specify simulation clock step
value field on the Extended Options Menu, the Simulation
Clock Step Value panel, shown Figure 3-26, is displayed.
/----------------------- Simulation Clock Step Value ------------------------\
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|Inquiry Step: BAT - Batch Initiator Simulation |
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|Simulation clock step value ===> __ (Blank/2/5/10/15/20/30/60 sec) |
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Figure 3-26. Simulation Clock Step Value Panel
The simulation clock step value is the multiple (in seconds)
used to simulate job arrival rates and execution times.
The valid values are shown on the panel; the default value is
blank, meaning that the data will be scanned to determine the
largest value which is less than or equal to the 20th
percentile of the incoming data. This value becomes the
default.
Small values provide a more granular simulation which may
improve validation. Large values, on the other hand, are
less costly to run and are suitable in cases where a high
degree of accuracy is not essential.
For example, setting the value to 5 causes the simulation
clock step to be five seconds. This means that initiator
busy status and job queue lengths, both a function of job
arrival rates and execution times, are evaluated at
five-second intervals. For instance, if initiator X is free
at time T1 and there is a job waiting to execute, the
initiator is presumed busy for the next five seconds, even
though the actual job execution time may have been less.
Hence, the simulated throughput of the initiator is more
pessimistic than the actual initiator.
