PQ95225: PERFORMANCE IMPROVEMENT FOR HPFP REORGANIZATION

APAR status

• Closed as unreproducible in next release.

Error description

• A performance improvement for HPFP Reorganization for both
  elapsed time and CPU time.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of High Performance Fast Path      *
  *                 Reorganization Tool Version 2 Release 1.     *
  *                 (FMID: H31A210)                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: HPFP Reorganization should improve      *
  *                      performance for elapsed time, CPUTIME   *
  *                      of unload function and reload function. *
  ****************************************************************
  * RECOMMENDATION: Apply the maintenance for this APAR.         *
  ****************************************************************
  Compared with the equivalent unload function and reload function
  of Fast Path Basic tools Version 2 Release 1, the improvement
  in performance was required. Elapsed time and CPUTIME are
  longer.
  

Problem conclusion

Temporary fix

Comments

• The following correspondences were performed in order to solve
  a performance issue.
  1.Eliminate redundancy statements and processes.
   - Only the necessary work fields of each module are
     initialized.
   - Efficient use of MVCL and a MVC statement is performed.
  2.Review of the input and output processing to unloaded
  segment record data set and VSAM area data set.
   - WAIT time of input and output is reduced by preparing 2 UOW
     buffers in address space, and performing parallel reading
     and writing for RAP processing.
   - By setting BUFNO to 40, the input and output processing
     of unloaded segment records data set is performed
     efficiently.
   ( The improvement for unload function. )
     - When it is DB without the definition of SDEP, or SDEP=NO,
       reading of a SDEP part is eliminated.
       EXCP is reduced.
     - Reading of the SDEP part to data space is carried out only
       within the limits of LE/LB, and EXCP is reduced.
     - CPUTIME is decreased by outputting to direct unloaded
       segment records data set from the input thread task.
       The process is performed under the following all
       conditions.
       a.SORT=NO (default) is specified in HFPSYSIN.
       b.Randomizer is not called for unload process.
       c.Only unloaded segment record of one area is contained
         in unloaded segment records data set.
  New message HFPV0004I is introduced for usability.
   - When HPFP reorganization can not acquire an IOVF and/or an
     SDEP part into data space as the work area, it shows the
     message HFPV0004I to inform to have used ADS directly.
  
  ========================
  = DOCUMENTATION CHANGE =
  ========================
  The IMS High Performance Fast Path Utilities for z/OS User's
  Guide Volume 1: High Performance Fast Path Reorganization
  Tool Version 2 Release 1 (SC18-7615-00) should be changed as
  follows:
  
  Appendix.E.3.12 Area I/O process
  The following description should be added to the message.
  
  ---------------------------------------------------------------
  HFPV0004I xxxx PART COULD NOT BE PRELOADED INTO A DATA SPACE FOR
             PROCESSING IN keyword=YES.
            - AREA NO: nn, AREANAME: areaname
  Explanation: Program HFPMAIN0 uses a VSAM area data set for
            xxxx (IOVF or SDEP) as the work area even if keyword
            (ICACHE or OCACHE)=YES is specified because the work
            area can not be acquired into data space.
  System Action: Processing is continued not using data space
            but using VSAM area data set for an IOVF and/or a
            SDEP part.
  Programmer Response: None.
  

APAR Information

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

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

  UQ94388

Modules/Macros

•    HFPFINI0 HFPFTTI0 HFPFUSR0 HFPJAIO0 HFPJINI0
  HFPJIUS0 HFPJMAN0 HFPJOMN0 HFPJOUS0 HFPJPTR0 HFPJQUS0 HFPJRAP0
  HFPJRND0 HFPJSDL0 HFPJSDP0 HFPJSMT0 HFPJUOW0 HFPJUSR0 HFPJWUS0
  HFPKACT0 HFPKART0 HFPKFRU0 HFPKFSE0 HFPKGUS0 HFPKILC0 HFPKIMN0
  HFPKIOV0 HFPKIUS0 HFPKMAN0 HFPKSDL0 HFPKSDP0 HFPKSEG0 HFPKSIM0
  HFPKSPT0 HFPKUSR0 HFPLCCT0 HFPLDBR0 HFPLINF0 HFPLINI0 HFPLLCT0
  HFPLMAN0 HFPLOFT0 HFPLRPT0 HFPLSEG0 HFPLTOT0 HFPMAIN0 HFPMCCT0
  HFPMTRC0 HFPRDSP0 HFPRTDF0 HFPRTDX0 HFPTECL0 HFPTFRM0 HFPTICR0
  HFPTKEY0 HFPTRCL0 HFPTUCL0 HFPUDBG0 HFPUIN   HFPUMCT0 HFPUMVT0
  HFPUROB0 HFPUTASK HFPUWLD0 HFPUWTO0 HFPVBFG0 HFPVBFI0 HFPVBRD0
  HFPVBWR0 HFPVCLS0 HFPVDRD0 HFPVDWR0 HFPVINI0 HFPVIOM0 HFPVMMC0
  HFPVMMS0 HFPVOPN0 HFPVSTR0 HFPVTRM0 HFPWMTV0 HFPZACT  HFPZCCT
  HFPZFCT  HFPZIAD  HFPZMCT  HFPZMVT  HFPZROB  HFPZTTT  H31A210J
  

Fix information

• Fixed component name

  IMS HP FP UTILI

• Fixed component ID

  5655K9400

Applicable component levels

• R210 PSY UQ94388

     UP04/11/03 P F411