IBM Support

PI94531: UPDATE THE DEFAULT VALUES OF JVM OPTIONS -XSCMAXAOT AND -XSCMX TO DECREASE APPLICATION SERVER STARUP TIME.

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APAR status

  • Closed as program error.

Error description

  • The previous tuning of the JVM shared class cache is not
    optimal.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of IBM WebSphere Application      *
    *                  Server on Distributed platforms that use    *
    *                  the IBM Java 8 SDK.                         *
    ****************************************************************
    * PROBLEM DESCRIPTION: The default size of the shared class    *
    *                      cache used by Node Agent and            *
    *                      Application Server JVMs is not          *
    *                      optimal.                                *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    The default sizes of the Java shared class cache and its
    AOT region should increase in order to reduce the elapsed
    startup time of Application Servers.  These sizes are
    specified by JVM options -Xscmx and -Xscmaxaot and differ per
    edition.
    For base edition, the size of the shared class cache
    (-Xscmx) used by Application Servers increases from
    60M to 90M, and its AOT region (-Xsacmaxaot) from 8M to 12M.
    For Network Deployment edition, the size of the shared
    class cache (-Xscmx) used by Application Servers and Node
    Agents increases from 90M to 120M, and its AOT region
    (-Xsacmaxaot) from 8M to 16M.
    

Problem conclusion

  • Apply APAR PI94531 to increase the default dimensions of the
    shared class cache used by Node Agent and Application Server
    JVMs in order to reduce Application Server startup time.
    
    The fix for this APAR is currently targeted for inclusion in
    fix packs 9.0.0.8 and 8.5.5.14.  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

    PI94531

  • Reported component name

    WEBS APP SERV N

  • Reported component ID

    5724H8800

  • Reported release

    900

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2018-03-02

  • Closed date

    2018-03-07

  • Last modified date

    2018-06-13

  • 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

    WEBS APP SERV N

  • Fixed component ID

    5724H8800

Applicable component levels



Document information

More support for: WebSphere Application Server
General

Software version: 900

Reference #: PI94531

Modified date: 13 June 2018


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