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PH15912: PREVENT CPU INCREASE IF ONLY CHIN ASID IS RESTARTED AFTER APPLY OF APAR PH04893 19/10/01 PTF PECHANGE

A fix is available

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APAR status

  • Closed as program error.

Error description

  • If the fix for APAR PH04893 (V9 - UI60516 & V9.1 - UI60517)
    is applied and afterwards only the CHIN ASID is restarted,
    the high CPU issue is not fully resolved. Both MSTR and CHIN
    ASID's must be restarted for the fix to be 100% effective.
    Therefore, this APAR is created as a PE against PTF UI60517 to
    fully resolve the high CPU issue in the case where only the CHIN
    ASID is restarted after the apply.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
    *                 Release 0 Modification 0 and Release 1       *
    *                 Modification 0.                              *
    ****************************************************************
    * PROBLEM DESCRIPTION: Customer sees a large increase, of 20%- *
    *                      30% in CPU after applying and running   *
    *                      fixes UI60516 or UI60517 (PH04893) ONLY *
    *                      in the CHINIT address space.            *
    ****************************************************************
    Problem occurs when APAR PH04893 has been applied and only
    the channel initiator has been restarted, and not the Queue
    Manager address space itself.
    

Problem conclusion

  • Additional condition logic has been added to cater for when the
    channel initiator has been restarted but not the Queue Manager
    address space when the original fix/APAR has been applied.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PH15912

  • Reported component name

    IBM MQ Z/OS V9

  • Reported component ID

    5655MQ900

  • Reported release

    000

  • Status

    CLOSED PER

  • PE

    YesPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2019-08-21

  • Closed date

    2019-10-01

  • Last modified date

    2019-11-01

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

    UI65604 UI65605

Modules/Macros

  • CMQXRMNT CSQIRECP CSQMFWCO CSQMSTRT CSQURFXC CSQXRCTL CSQXRFXC
    CSQXRRMF
    

Fix information

  • Fixed component name

    IBM MQ Z/OS V9

  • Fixed component ID

    5655MQ900

Applicable component levels

  • R000 PSY UI65604

       UP19/10/31 P F910 {

  • R100 PSY UI65605

       UP19/10/29 P F910 {

Fix is available

  • Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.

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Document Information

Modified date:
01 November 2019