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Status Not under consideration
Workspace IBM i
Created by Guest
Created on Jan 4, 2020

Add Support for Automatic Prestart Job Tuning

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.


Use Case:

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.


Idea priority High
  • Guest
    Jan 13, 2021

    Missing documentation link from previous comment:
    https://www.ibm.com/support/knowledgecenter/ssw_ibm_i_74/rzajq/rzajqudfpjstatistics.htm

  • Guest
    Jan 12, 2021

    Function related to this RFE was recently provided via PTF (see below) which would allow a user to do their own automatic pre-start job tuning via the API and SQL service.
    We still have no plans to create an automatic tuner at this time.
    The API, QWTRAPJS, is currently available on 7.2, 7.3 and 7.4 with the following PTF's:
    7.2 - SI69201
    7.3 - SI69210
    7.4 - SI69214
    Retrieve Active Prestart Job Status (QWTRAPJS) API https://www.ibm.com/support/knowledgecenter/ssw_ibm_i_74/apis/qwtrapjs.htm

    The SQL service, PRESTART_JOB_STATISTICS is available on 7.3 and 7.4 with the following PTF's:
    SF99704 Level 7 (for 7.4)
    SF99703 Level 18 (for 7.3)
    The documentation can be found at this link:

  • Guest
    Sep 28, 2020

    Thank you for submitting your request. While this would be nice to have, it's not something we can contain in our current plans/schedules, so I am declining the request at this time.

  • Guest
    Apr 21, 2020

    CEAC has reviewed the RFE and we believe the functionality will be delivered in 7.4 TR2 and 7.3 TR8.
    Should be available 15th May 2020.

    https://www.ibm.com/support/knowledgecenter/ssw_ibm_i_74/rzajq/rzajqudfpjstatistics.htm
    https://www.ibm.com/support/knowledgecenter/ssw_ibm_i_74/rzajq/rzajqviewpjinfo.htm

  • Guest
    Mar 10, 2020

    The CAAC has reviewed this requirement and recommends that IBM view this as a medium priority requirement that is important to be addressed. IBM i's selling point is the automation for ease of use, so this would definitely be great to have.

    Background: The COMMON Americas Advisory Council (CAAC) members have a broad range of experience in working with small and medium-sized IBM i customers. CAAC has a key role in working with IBM i development to help assess the value and impact of individual RFEs on the broader IBM i community, and has therefore reviewed your RFE.

    For more information about CAAC, see www.common.org/caac

    For more details about CAAC's role with RFEs, see http://www.ibmsystemsmag.com/Blogs/i-Can/May-2017/COMMON-Americas-Advisory-Council-%28CAAC%29-and-RFEs/

    Nancy Uthke-Schmucki - CAAC Program Manager