IBM Support

IT08284: WMQ 8.0 QUEUE MANAGER BECOMES SLOW OR UNRESPONSIVE WHEN THE CLIENT CONNECTIONS INCREASE

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APAR status

  • Closed as program error.

Error description

  • When number of the connections increases, WebSphere MQ 8.0 queue
    manager performance declines quickly, and becomes slow or
    unresponsive then.
    The FDCs with Probe IDs XC307100 and/or XC308010 might also be
    generated with
    high CPU usage from channel processes.
    
    Probe Id :- XC307100
    Component :- xlsRequestMutex
    Program Name :- amqrmppa
    Major Errorcode :- xecL_W_LONG_LOCK_WAIT
    
    MQM Function Stack
    ccxResponder
    rrxResponder
    rriAcceptSess
    rriAcceptSessReceive
    rriAddStatusEntry
    xlsRequestMutex
    xcsFFST
    
    Probe Id :- XC308010
    Component :- xlsReleaseMutex
    Program Name :- amqrmppa
    Major Errorcode :- xecL_W_LONG_LOCK_WAIT
    
    MQM Function Stack
    ccxResponder
    rrxResponder
    rriAcceptSess
    rriAcceptSessReceive
    rriAddStatusEntry
    xlsReleaseMutex
    xcsFFST
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users using MQ v8 queue manager with lot of MQ clients and/or
    with clients often connecting and disconnecting.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    This problem occurred because of delay in scanning the channel
    status table.
    

Problem conclusion

  • MQ has been modified to improve the performance when scanning
    the channel status table.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v8.0       8.0.0.2
    
    The latest available maintenance can be obtained from
    'WebSphere MQ Recommended Fixes'
    http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
    
    If the maintenance level is not yet available information on
    its planned availability can be found in 'WebSphere MQ
    Planned Maintenance Release Dates'
    http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
    ---------------------------------------------------------------
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT08284

  • Reported component name

    WMQ BASE MULTIP

  • Reported component ID

    5724H7251

  • Reported release

    800

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2015-04-13

  • Closed date

    2015-04-29

  • Last modified date

    2015-05-05

  • 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

    WMQ BASE MULTIP

  • Fixed component ID

    5724H7251

Applicable component levels

  • R800 PSY

       UP

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Document Information

Modified date:
05 May 2015