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PI48619: EXCESSIVE APPENDCUSTOMSETSTRING CALLS CAUSE HIGH CPU

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APAR status

  • Closed as program error.

Error description

  • Intelligent Management is calling appendSetCustomSetString
    method very frequently, which can lead to high CPU.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of IBM WebSphere Application      *
    *                  Server Intelligent Management (IM) and      *
    *                  Performance Monitoring Infrastructure       *
    *                  (PMI)                                       *
    ****************************************************************
    * PROBLEM DESCRIPTION: IM is making frequent calls to PMI      *
    *                      methods to enable a specific set of     *
    *                      counters. This can cause high cpu       *
    *                      usage.                                  *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    Intelligent Management which is part of Websphere Application
    Server V8.5.0.0 and later, requires a default set of PMI
    counters to be enabled. IM frequently calls PMI methods to
    ensure these counters are always enabled. These frequent calls
    to the PMI methods can cause high cpu usage.
    

Problem conclusion

  • IM will now call a new method in the Perf MBean that will lock
    the required PMI counters and avoid any need for subsequent
    checks to see which counters are enabled.  The new Perf MBean
    method (for WebSphere internal use only) is
    "appendLockCustomSetString".
    
    The fix for this APAR is currently targeted for inclusion in
    fix packs 7.0.0.41, 8.0.0.12 and 8.5.5.8.  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

    PI48619

  • Reported component name

    WEBS APP SERV N

  • Reported component ID

    5724H8800

  • Reported release

    850

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2015-09-11

  • Closed date

    2015-11-05

  • Last modified date

    2016-01-06

  • 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

  • R700 PSY

       UP

  • R800 PSY

       UP

  • R850 PSY

       UP



Document information

More support for: WebSphere Application Server
General

Software version: 850

Reference #: PI48619

Modified date: 06 January 2016