PM52580: Object grid RemoteCacheLoader threads are excessively created and destroyed, which can lead to out of memory exceptions.

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APAR status

  • Closed as program error.

Error description

  • OGRemoteCacheLoader threads are excessively created and
    destroyed, which can lead to out of memory errors.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  Users of WebSphere eXtreme Scale who use    *
    *                  the AgentManager function.                  *
    ****************************************************************
    * PROBLEM DESCRIPTION: The thread pool used to dispatch        *
    *                      AgentManager work to applicable         *
    *                      partitions had a minimum value less     *
    *                      than the maximum value.                 *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    When the minimum and maximum value of a thread pool do not
    match, the threads can be deleted and recreated again when
    more threads are needed.  This behavior creates more native
    threads on the operating system, which can lead to issues with
    not being able to create threads.  When Java cannot create a
    thread, it throws an OutOfMemoryException exception.  This type
    of condition is usually seen when the operating system is
    configured with a restrictive ulimit setting.
    

Problem conclusion

  • The thread pool was updated to have a minimum and maximum set
    to the same value of 50, and it was made configurable using the
    system properties
    com.ibm.websphere.xs.commandDispatchMinThreads and
    com.ibm.websphere.xs.commandDispatchMaxThreads to override the
    minimum and maximum thread pool size.  The thread names also
    changed from being called OGRemoteCacheLoader threads to
    being called WXSCommandDispatch threads.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM52580

  • Reported component name

    XD EXTREME SCAL

  • Reported component ID

    5724J3402

  • Reported release

    710

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-11-18

  • Closed date

    2012-02-01

  • Last modified date

    2012-02-01

  • 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

    XD EXTREME SCAL

  • Fixed component ID

    5724J3402

Applicable component levels

  • R710 PSY

       UP



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Document information


More support for:

WebSphere eXtreme Scale
General

Software version:

710

Reference #:

PM52580

Modified date:

2012-02-01

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