IBM Support

PM51889: DECREASE CLUSTER STARTUP TIME.

Subscribe

You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • The time to start a cluster is longer than expected.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All IBM WebSphere Application Server V8.0   *
    *                  users of Base and Network Deployment        *
    *                  editions.                                   *
    ****************************************************************
    * PROBLEM DESCRIPTION: Excessive JIT compilation increases     *
    *                      the start time of servers and           *
    *                      clusters.                               *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    The Java JIT compiler provides a performance boost by
    compiling frequently used classes in such a way that future
    invocations of those classes perform better.  However, the
    initial compilation of these classes takes additional time.
    For classes that are used often throughout the life of the
    server, it is worth taking the initial time to compile them in
    order to obtain future performance benefits.
    During server startup, numerous classes are loaded that will
    rarely be invoked after startup is complete.  Compiling all of
    these classes is often unnecessary and can increase server
    start time.  The JIT compiler should be optimzied to avoid
    unnecessary compilations during server startup.
    

Problem conclusion

  • WebSphere Application Server was modified to inform the JIT
    compiler of the beginning and end of server  startup.  The JIT
    compiler can use this information to make better decisions
    about which classes to compile, thereby improving the start
    time of servers and clusters.
    
    The fix for this APAR is currently targeted for inclusion in
    fix pack 8.0.0.3.  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

    PM51889

  • Reported component name

    WEBS APP SERV N

  • Reported component ID

    5724H8800

  • Reported release

    800

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-11-09

  • Closed date

    2011-11-30

  • Last modified date

    2011-11-30

  • 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

  • R800 PSY

       UP



Document information

More support for: WebSphere Application Server
General

Software version: 8.0

Reference #: PM51889

Modified date: 30 November 2011


Translate this page: