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PI82237: INCREASE THE JAVA SHARED CLASS CACHE SIZE FOR WEBSPHERE APPLICATION SERVER FOR Z/OS SERVANT ADDRESS SPACES.

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APAR status

  • Closed as program error.

Error description

  • The current 75M default shared class cache size is not optimal
    for WAS z/OS Servants.  An increase to 125M has been shown to
    decrease startup times.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of IBM WebSphere Application      *
    *                  Server for z/OS                             *
    ****************************************************************
    * PROBLEM DESCRIPTION: The default maximum size of the         *
    *                      shared class cache, 75M, is not         *
    *                      optimal.                                *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    Prior to version 9.0.0.5 each Java Virtual Machine (JVM)
    contained by the control, control region adjunct, and servant
    regions composing a server instance will launch with
    default option -Xscmx=75M, the maximum size of the shared
    class cache, whenever the option is not otherwise declared in
    the server configuration. Increasing the value to 125M for both
    the servant and adjunct JVMs will reduce the elapsed time to
    start a server by up to 4%.
    

Problem conclusion

  • Apply APAR PI82237 to change the default maximum size of the
    shared class cache to 125M (-Xscmx125M) for the servant and
    adjunct JVMs of a server instance.
    
    The fix for this APAR is currently targeted for inclusion in
    fix pack 9.0.0.5.  Please refer to the Recommended Updates
    page for delivery information:
    http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI82237

  • Reported component name

    WEBSPHERE FOR Z

  • Reported component ID

    5655I3500

  • Reported release

    900

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2017-05-30

  • Closed date

    2017-06-27

  • Last modified date

    2017-11-07

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

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

Fix information

  • Fixed component name

    WEBSPHERE FOR Z

  • Fixed component ID

    5655I3500

Applicable component levels

  • R900 PSY

       UP

[{"Business Unit":{"code":"BU053","label":"Cloud \u0026 Data Platform"},"Product":{"code":"SS7K4U","label":"WebSphere Application Server for z\/OS"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"900","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
18 October 2021