PI26943: PERFORMANCE DEGRADATION DUE TO EXCESSIVE NUMBER OF IRTMSG CALLS

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Performance degradation due to an excessive amount of IRTMSG
  processing in PRF 2.2.  IRTRFE13 calls IRTMSG multiple times
  to write DEBUG IRT000I messages even though DEBUG is not in
  use (no IRT$DBG DD statement).  Unneccessary IRT000I messages
  are written to an in-core DEBUG table resulting in increased
  CPU and decreased performance.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All Users of Program Restart Facility V2R2   *
  ****************************************************************
  * PROBLEM DESCRIPTION: Tracing module IRTMSG processes trace   *
  *                      messages even though tracing DD ITR$DBG *
  *                      is not present.                         *
  *                                                              *
  *                      Remove extraneous calls to IRTMSG.      *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Module IRTMSG is changed such that it does not process trace
  messages (IRT000I) when tracing DD IRT$DBG is not present.
  
  Various modules changed to remove extraneous calls to IRTMSG.
  

Problem conclusion

• System performance is improved when tracing DD IRT$DBG is not
  present in the JCL because module IRTMSG does not process trace
  messages.
  
  System performance is improved when IRTMSG is not called
  extraneously.
  

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:

  UI25743

Modules/Macros

•    IRTAUPX0 IRTDDA10 IRTDSL10 IRTFCMD0 IRTFLX10
  IRTFLX11 IRTFLX12 IRTFLX13 IRTFLX14 IRTFLX90 IRTFSC09 IRTFSC10
  IRTFSC11 IRTFSC12 IRTFSC13 IRTFSC14 IRTFXSR0 IRTGQSC0 IRTIBBD0
  IRTMSG   IRTRFE09 IRTRFE10 IRTRFE11 IRTRFE12 IRTRFE13 IRTRFE14
  IRTXSC09 IRTXSC10 IRTXSC11 IRTXSC12 IRTXSC13 IRTXSC14
  

Fix information

• Fixed component name

  IMS PGM RESTART

• Fixed component ID

  5655E1400

Applicable component levels

• R220 PSY UI25743

     UP15/03/10 P F503

Fix is available

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