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IT16751: Extreme slowness putting messages to queues.

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APAR status

  • Closed as program error.

Error description

  • After applying fixpack 8.0.0.5, putting messages onto queues is
    very slow.
    
    MQPUTs take much longer than expected and trace of the
    responsible amqrmppa process shows many delays.
    
    The zsqMQPUT call takes many multiples of the 5 ms threshold to
    complete.  For example:
    
    16:07:00.361008   978748.163     CONN:0000ae (07)--------{
    zsqMQPUT
     16:07:17.065394   978748.163     CONN:0000ae (07)--------}
    zsqMQPUT
    rc=OK FunctionTime=62338
    
    Inspection within the MQPUT call shows multiple delays in
    opening the mqat.ini file and what looks parsing through the
    file:
    
    16:07:00.361012   978748.163     CONN:0000ae (08)---------{
    zsqConfigureAT
    16:07:04.306651   978748.163     CONN:0000ae      INI_FILE:
    Opened file
    /MQHA/qmgrs/QMNAME/mqat.ini.
    16:07:08.819812   978748.163     CONN:0000ae (08)---------}
    zsqConfigureAT rc=OK FunctionTime=73829
    
    16:07:08.819833   978748.163     CONN:0000ae (08)---------{
    zsqConfigureAT
    16:07:08.819859   978748.163     CONN:0000ae (09)----------{
    zsqLoadATConfigFile
     *16:07:13.027157   978748.163     CONN:0000ae      INI_FILE:
    Opened
    file /MQHA/qmgrs/QMNAME/mqat.ini.
    
    16:07:17.063826   978748.163     CONN:0000ae (09)----------}
    zsqLoadATConfigFile rc=OK FunctionTime=65491
    16:07:17.064099   978748.163     CONN:0000ae (08)---------}
    zsqConfigureAT rc=OK FunctionTime=64322
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users using MQ 8.0.0.5
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    This problem occurred because of the side effect of a change
    made for AMQP activity trace in MQ 8.0.0.5. The change caused
    the queue manager often opening the mqat.ini file even for non
    AMQP connections.
    

Problem conclusion

  • Appropriate code changes have been made to ensure the changes
    made for AMQP activity trace is restricted only to AMQP
    connections.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v8.0       8.0.0.6
    v9.0 CD    9.0.2
    v9.0 LTS   9.0.0.1
    
    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

    IT16751

  • Reported component name

    WMQ BASE MULTIP

  • Reported component ID

    5724H7251

  • Reported release

    800

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-08-24

  • Closed date

    2016-11-30

  • Last modified date

    2017-06-01

  • 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

    WMQ BASE MULTIP

  • Fixed component ID

    5724H7251

Applicable component levels

  • R800 PSY

       UP

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Document Information

Modified date:
01 June 2017