PI06968: HIGH CPU CHIN INCREASED CPU UTILIZATION

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Increased cpu in channel initiator ( CHIN CHINIT ).
  Increase in storage used by the CHIN as indicated by message
  CSQX004I. This leads to a daily increase in the CPU used by
  the CHIN. The problem occurs when using multiplexed channels.
  .
  Additional Symptoms and Keywords:
  There is a storage leak of ZSTM control blocks associated with
  message properties: XHSG, XMSH, ZSTM, ZRFP
  .
  Subpool 0 Key 8 SP0 KEY8 CSQX027E
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
  *                 Release 1 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: The CPU and storage usage increases in  *
  *                      the channel initiator over time,        *
  *                      indicated by message CSQX004I.          *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When clients sharing conversations (i.e. SHARECNV > 0) are used
  in conjunction with message handles, the XMSH, ZSTM, XHSG and
  ZRFP control blocks anchored in the session get allocated by
  rriGetMsgHandle, however they are not released when the
  conversation and session are ended.
  Thus storage is leaked.
  

Problem conclusion

• The code was changed to correctly free the message handle
  control blocks when the session is deallocated.
  100Y
  CSQXRMAS
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UI14133

Modules/Macros

• CSQXRMAS
  

Fix information

• Fixed component name

  WMQ Z/OS V7

• Fixed component ID

  5655R3600

Applicable component levels

• R100 PSY UI14133

     UP14/02/05 P F402 Ž

Fix is available

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