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PI05792: HIGH CPU IN CSQ7PLRT

A fix is available

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APAR status

  • Closed as unreproducible in next release.

Error description

  • High CPU in CSQ7PLRT
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
    *                 Release 1 Modification 0.                    *
    ****************************************************************
    * PROBLEM DESCRIPTION: High CPU utilisation in program         *
    *                      CSQ7PLRT when SMF class(3) accounting   *
    *                      trace is running.                       *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    Each time CSQ7PLRT is resumed by CSQ7COLL or CSQ7DEAL it scans
    a hash chain to look for deallocated tasks which it can then
    write SMF accounting for. This is inefficient and can be CPU
    intensive.
    

Problem conclusion

Temporary fix

Comments

  • CSQ7COLL and CSQ7DEAL have been changed so that they no longer
    place the deallocated thread block pointer on a hash chain
    but on a list which contains only those threads which should be
    processed. This is much more efficient.
    ×**** PE14/06/06 FIX IN ERROR. SEE APAR PI19319  FOR DESCRIPTION
    

APAR Information

  • APAR number

    PI05792

  • Reported component name

    WMQ Z/OS V7

  • Reported component ID

    5655R3600

  • Reported release

    100

  • Status

    CLOSED UR1

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2013-11-08

  • Closed date

    2014-04-14

  • Last modified date

    2014-06-12

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

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

    UI17012

Modules/Macros

  • CSQ7COLL CSQ7DEAL CSQ7PLRT
    

Fix information

  • Fixed component name

    WMQ Z/OS V7

  • Fixed component ID

    5655R3600

Applicable component levels

  • R100 PSY UI17012

       UP14/05/17 P F405

Fix is available

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Document Information

Modified date:
12 June 2014