PK35683: RESPONSE TIME PROBLEMS OR HANGS OCCUR DURING DUMP FORMATTING OF THE AP DOMAIN WHEN MANY TASKS ARE QUEUED IN TCLASS WAITS.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When formatting a CICS system dump in IPCS with the DFHPD620
  program, response time problems may occur if the AP=3 keyword is
  used.  This will happen if there are many transactions queued in
  TCLASS / TRANSACTION CLASS waits when the dump was taken.  The
  DFHAPDUF routine along with other I/O format routines will
  perform transaction browses.  All the transactions are looked at
  including the ones in TCLASS waits that will not be formatted in
  the AP domain report.  Eventually the report will complete if
  the request is not timed out.  Yet the time it takes to format
  the AP domain report can be so excessive its prohibitive to run.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All                                          *
  ****************************************************************
  * PROBLEM DESCRIPTION: Running with the CICS VERBX with        *
  *                      keyword AP=3 against a CICS system      *
  *                      dump can result in excessive CPU time   *
  *                      and elapsed time used.                  *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  DFHAPDUF has to browse the transactions in a CICS system dump as
  part of its formatting work. This entails constructing three
  lists of the transactions during the formatting of control
  blocks with AP=2 or 3.
    In a dump with many tasks waiting to run in the CICS SYSTEM
  (i.e. held back due to TCLASS or TRANCLASS limits) then these
  can result in excessive CPU time and elapsed time when running
  the dump formatter.
    Formatting with keyword AP=1 does not format the control
  blocks and so does not expose this problem.
  Keywords: DFHPD640 maxtask sysdump sdump VERBEXIT PERFM
  

Problem conclusion

• DFHAPDUF has been changed to not format any transaction control
  blocks for transactions with a TCA address of nulls.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

  PK32808

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

  UK20842

Modules/Macros

•    DESXMXN  DFHAPDUF DFHXMIQS
  

Fix information

• Fixed component name

  CICSTS 3.1 Z/OS

• Fixed component ID

  5655M1500

Applicable component levels

• R400 PSY UK20842

     UP06/12/30 P F612

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.