PM50424: IMS PA LOOPS IN IPI4QMGR DUE TO A STORAGE REQUEST THAT CANNOT BE SATISFIED

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The looping through the storage manager routine IPI4QMGR is due
  to a storage request that cannot be satisfied as it has hit VS
  high-water mark and no transactions are being flushed.
  The loop shows at offsets x'37a', x'39a', x'39e', x'3a2, x'3a6'.
  
  When IMS PA hits VS high-water it must flush incomplete
  transactions thereby freeing storage to create new transaction
  entries. If the transactions consist of a single program-switch
  chain this is flushed only when the switch count wraps (64k). In
  an environment in which storage is constrained the switch count
  will not reach the wrap point, hence no flushing occurs.
  

Local fix

• A possible local fix is to set the region= parm on the JOB EXEC
  statement to 0M as REGION=0M.  If this is successful or not may
  depend on your system storage configuration.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of IMS Performance Analyzer V4.2       *
  ****************************************************************
  * PROBLEM DESCRIPTION: IMS PA loops through the storage manger *
  *                      routine (IPI4QMGR) with a storage       *
  *                      request that cannot be satisfied as     *
  *                      it has hit VS high-water mark and no    *
  *                      transactions are being flushed.         *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When IMS PA hits VS high-water it must flush incomplete
  transactions thereby freeing storage to create new
  transaction entries. If the transactions consist of a
  single program-switch chain this is flushed only when
  the switch count wraps (64k). In an environment in which
  storage is constrained the switch count will not reach
  the wrap point, hence no flushing occurs.
  

Problem conclusion

• At VS high-water mark processing flush program switch
  chain irrespective of the switch count.
  

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:

  UK73616

Modules/Macros

• IPIIPROC IPISAPAR IPI4PROC
  

Fix information

• Fixed component name

  IMS PERF ANALYZ

• Fixed component ID

  5655E1500

Applicable component levels

• R420 PSY UK73616

     UP11/11/10 P F111

Fix is available

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