PI06279: CPU UTILIZATION INCREASES GRADUALLY ALONG WITH AN INCREASE IN SP0 KEY8

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• A gradual increase in CHIN CPU usage is noticed and dump review
  reveals growth in Subpool 0 Key 8 storage which contains
  orphanned XSCS control blocks used for shared channel status.
  Change Team finds high CPU is due to a leak of these control
  blocks associated with a client connection which connects to
  a shared listener.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ Version 7          *
  *                 Release 0 Modification 1 and                 *
  *                 Release 1 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: CHIN CPU usage increases gradually      *
  *                      along with a growing memory allocation  *
  *                      in storage pool 0 key 8.                *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When multiplexed SVRCONN channels connected to shared listener
  ports disconnect all conversations, the associated XSCS shared
  channel status entries are not freed.
  

Problem conclusion

• Function rriFreeSess has been changed to check XSCS pointer
  associated with primary conversation as well as with the current
  conversation before deciding to free the XSCS entry.
  010Y
  100Y
  CSQXRMSS
  

Temporary fix

Comments

APAR Information

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

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

  UI14912 UI14913

Modules/Macros

• CSQXRMSS
  

Fix information

• Fixed component name

  WMQ Z/OS V7

• Fixed component ID

  5655R3600

Applicable component levels

• R010 PSY UI14912

     UP14/03/04 P F403 Ž

• R100 PSY UI14913

     UP14/03/04 P F403 Ž

Fix is available

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