PI23535: MAKE APPLICATION ADDRESS SPACES NON-SWAPPABLE DURING END-OF-TASKPROCESSING, MQDISC AND MQCONN BASED ON CONNSWAP SETTING.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• This APAR is raised to look into making application
  address spaces non-swappable during end-of-task processing
  (CSQSTERM) and also during MQDISC and MQCONN processing
  based on the CONNSWAP setting (all other API calls are
  currently handled).
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
  *                 Release 1 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: MQ calls are delayed due to an address  *
  *                      space doing an API call being swapped   *
  *                      out.                                    *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The CONNSWAP attribute controls whether BATCH address spaces can
  be swapped out for certain MQ calls, excluding MQCONN and
  MQDISC.
  Thus, for an MQDISC call (or end of task processing) it is still
  possible that the BATCH address space is swapped out whilst
  holding on to MQ resources such as latches, causing a temporary
  impact on performance until it is swapped back in.
  

Problem conclusion

• The code was changed for CONNSWAP to also affect MQCONN and
  MQDISC calls.
  Implicit MQDISC calls and RRS exits have been changed to always
  be non-swappable to prevent resource contention in MQ.
  100Y
  CSQAPRHX
  CSQARIB
  CSQ3RRSX
  CSQ3RRXF
  CSQ3SSES
  CSQ3SSI2
  

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:

  UI21366 PI27589

Modules/Macros

• CSQAPRHX CSQARIB  CSQ3RRSX CSQ3RRXF CSQ3SSES CSQ3SSI2
  

Fix information

• Fixed component name

  WMQ Z/OS V7

• Fixed component ID

  5655R3600

Applicable component levels

• R100 PSY UI21366

     UP14/10/07 P F410 ¢

Fix is available

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