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The shipped defaults for the various prestart job entries are generally not appropriate for highly used prestart jobs. In today's environment, prestart jobs are used by almost every IBM i shop.
Most shops do not tune their prestart job entries and run with the default values.
Of most importance is the setting of the INLJOBS parameter.
The system keeps track of usage statistics already (DSPACTPJ and the associated API added in 7.4). These usage statistics could be used to programmatically tune the INLJOBS prestart job entries to more appropriate values.
For automatic tuning, the INLJOBS parameter could be dynamically adjusted to the average number of jobs. Peak may not be a good choice, since artificially large peaks can occur. Dynamically adjusting INLJOBs to the average will make manual tuning much less important.
This is most important for the host servers, the DDM/DRDA server, and the SQL Server mode server, but consideration should be made for all prestart server jobs.
The default should be to enable this dynamic tuning with an option to disable it; the setting should be global (a system value), as well as on individual prestart job entries.
Clients are not aware of the need to tune their prestart job entries and many run with the system supplied defaults.
Providing automatic prestart job tuning will allow all systems to run better.
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