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The accuracy of analysis by CA Mainframe Application Tuner is determined primarily by the number of observations taken over a specified period. The number of observations made, and subsequently the number of samples taken, are determined by the values that you supply in the Monitor duration and the Observations Requested fields on the Monitor Criteria panel. The observation rate, which is how often an observation is taken, is calculated internally by CA Mainframe Application Tuner.
For example, if you specify 6000 observations to be taken in 60 seconds, CA Mainframe Application Tuner automatically calculates the observation rate as follows:
60 seconds ΒΈ 6000 observations = .01 seconds
For this situation, CA Mainframe Application Tuner makes one observation every 10 milliseconds in the address space (if only one task is found).
If you want to monitor the entire duration of a job step, specify YES in the Monitor entire step field.
As a minimum, CA Mainframe Application Tuner takes the requested number of observations over a variable time frame. The actual number of observations taken might exceed the requested number of observations, but the number of observations considered for the reports is between the number of observations requested and no more than a maximum of 2 times the number of observations requested minus 1. This result assumes that the job step ran long enough to allow CA Mainframe Application Tuner to capture the requested number of observations at the highest observation rate.
Under certain circumstances, you might need to take significantly more observations. However, taking more observations requires more analysis time. It is recommended that you take between 3000 and 10000 observations for an effective balance of accuracy and performance.
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