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PM44176: A HIGH CPU CONSUMPTION NOTICED AFTER MIGRATION TO TWSZ V8.5.1 WHEN THE IA TIME IS CHANGED FOR AN OCCURRENCE

A fix is available

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APAR status

  • Closed as new function.

Error description

  • A high CPU consumption noticed after migration from
    TWSz V8.30 to V8.5.1. when the IA time is changed for an
    occurrence.
    During the analysis of provided documents and MCP code,
     the lab could identify  a module (EQQMC3IA) introduced by
    TWSz 8.5.0 that is called  by Occurrence Change routine
    when the IA time is changed for an occurrence, and found out
    that this new module strongly affect performances in this
    scenario.
    To improve performance, the module EQQMC3IA has to be
    restructured.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: ALL TWS for z/OS 8.5.0 and 8.5.1             *
    *                 USERs.                                       *
    *                                                              *
    *                 FUNCTION=MCP                                 *
    ****************************************************************
    * PROBLEM DESCRIPTION: Very low performance processing         *
    *                      is observed when executing the          *
    *                      manual occurrence Input Arrival Time    *
    *                      change via Modify Current Plan.         *
    ****************************************************************
    * RECOMMENDATION: APPLY THE PTF FIXING THIS APAR               *
    ****************************************************************
    Very low performance processing is observed when executing
    the manual occurrence Input Arrival Time change via Modify
    Current Plan.
    

Problem conclusion

Temporary fix

Comments

  • This flow has been completely redesigned by this apar
    to remove  many unuseful CP VSAM scans.
    The loop exit condition in the CP reading has been corrected
    and the old sequential access to search for possible records
    CP3Q has been replaced by an access by key.
    

APAR Information

  • APAR number

    PM44176

  • Reported component name

    TIV WRKLD SCHD

  • Reported component ID

    5697WSZ01

  • Reported release

    512

  • Status

    CLOSED UR1

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2011-07-21

  • Closed date

    2011-08-04

  • Last modified date

    2016-04-22

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

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

    UK70474 UK70475

Modules/Macros

  • EQQMC3IA EQQMC3RS
    

Fix information

  • Fixed component name

    TIV WRKLD SCHD

  • Fixed component ID

    5697WSZ01

Applicable component levels

  • R502 PSY UK70474

       UP11/09/20 P F109

  • R512 PSY UK70475

       UP11/09/20 P F109

  • R602 PSY UK70476

       UP11/09/22 P F109

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:
22 April 2016