PI48558: CSQY220I REPORTS A PERMANENT INCREASE OF LOCAL STORAGE USAGE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Queue Manager suffers an increase of WMQ storage.
  Dump shows high allocation in subpool 229, Key 7
  
  It occurs when in the middle of CSQSVSTK processsing,
  trying to find a free SKB, and the TCB processing is switched
  from one CPU - in the reviewed case from a zIIP to GCP.
  This results in the FINDFREE routine not checking all CPU slots
  for a free SKB, which leads to the build-up of storage.
  .
  Additionl keywords:
  SP229 KEY7
  

Local fix

• n/a
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 8 *
  *                 Release 0 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: On systems with a large number of CPUs  *
  *                      a steady increase in queue manager      *
  *                      storage may be seen as reported by      *
  *                      message CSQY220I.                       *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  During CSQSVSTK processing trying to find a free SKB,
  if the TCB is switched from one CPU to another the FINDFREE
  routine does not check all CPU slots for a free SKB.
  Hence extra storage may be allocated unnecessarily which
  leads to a build-up of storage.
  

Problem conclusion

• Code has been changed so that the checking of CPU slots
  in the FINDFREE routine is unaffected by TCB processing
  switching from one CPU to another.
  000Y
  CSQSVSTK
  

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:

  UI32462

Modules/Macros

• CSQSVSTK
  

Fix information

• Fixed component name

  WMQ Z/OS 8

• Fixed component ID

  5655W9700

Applicable component levels

• R000 PSY UI32462

     UP15/12/04 P F512 ¢

Fix is available

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