You may have specific applications that are extremely time critical or possibly applications that run in the ever shrinking night batch window. In these circumstances, you can increase the amount of virtual storage available for buffering to decrease the elapsed time for these jobs.
At other times, you may have important work that you do not want to interrupt, and you want to restrict the amount of buffering for any 'less important' jobs. Restricting buffering can detune these other jobs and reduce their CPU consumption, leaving more computing resources for the more important job(s). These detuned jobs consume approximately the same amount of CPU time, but over a longer elapsed time. These jobs become more I/O bound, which leaves more processor time for other jobs.
You can accomplish both tuning and detuning through the constraint control statements.
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