IBM Support

IC89405: WEBSPHERE MQ V7 PERFORMANCE ISSUE PROCESSING THE SYSTEM.CLUSTER.TRANSMIT.QUEUE WITH A LARGE NUMBER OF MESSAGES.

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APAR status

  • Closed as program error.

Error description

  • When a large build up of messages occurs on the
    SYSTEM.CLUSTER.TRANSMISSION.QUEUE, significant slow down is seen
    in processing these messages (channel 'get' time).
    This also affects other queues where multiple applications need
    to perform 'Get by CorrelId' and the queue is allowed to grow
    deep.
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users of WebSphere MQ on 32 bit distributed platforms who expect
    a deep build up of messages on any queue from which applications
    get messages by CorrelID.  A common internal use of this
    function is the SYSTEM.CLUSTER.TRANSMIT.QUEUE
    
    Platforms affected:
    All Distributed (iSeries, all Unix and Windows)
    ****************************************************************
    PROBLEM SUMMARY:
    Contention between multiple getting applications causes delay in
    retrieving correct message by correlation identifier.  This is
    not an issue on 64 bit platforms where an alternative mechanism
    is used to retrieve the appropriate message, which has different
    performance characteristics.
    

Problem conclusion

  • The 'get message' functionality has been improved to reduce time
    taken to identify messages for particular correlation identifier
    and thereby reduce contention between processes.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
                       v7.0
    Platform           Fix Pack 7.0.1.11
    --------           --------------------
    Windows            7.0.1.11
    AIX                7.0.1.11
    HP-UX (PA-RISC)    7.0.1.11
    HP-UX (Itanium)    7.0.1.11
    Solaris (SPARC)    7.0.1.11
    Solaris (x86-64)   7.0.1.11
    iSeries            7.0.1.11
    Linux (x86)        7.0.1.11
    Linux (x86-64)     7.0.1.11
    Linux (zSeries)    7.0.1.11
    Linux (Power)      7.0.1.11
    
                       v7.1
    Platform           Fix Pack 7.1.0.3
    --------           --------------------
    Windows            7.1.0.3
    AIX                7.1.0.3
    HP-UX (Itanium)    7.1.0.3
    Solaris (SPARC)    7.1.0.3
    Solaris (x86-64)   7.1.0.3
    iSeries            7.1.0.3
    Linux (x86)        7.1.0.3
    Linux (x86-64)     7.1.0.3
    Linux (zSeries)    7.1.0.3
    Linux (Power)      7.1.0.3
    
    Platform           v7.5
    --------           --------------------
    Multiplatforms     7.5.0.2
    
    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

    IC89405

  • Reported component name

    WMQ WINDOWS V7

  • Reported component ID

    5724H7220

  • Reported release

    700

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-01-09

  • Closed date

    2013-01-22

  • Last modified date

    2013-01-22

  • 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 WINDOWS V7

  • Fixed component ID

    5724H7220

Applicable component levels

  • R700 PSY

       UP

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Document Information

Modified date:
22 January 2013