II08030: FIS PERFORMANCE ENHANCEMENT CONSIDERATIONS

APAR status

• Closed as canceled.

Error description

• The items listed below can be used to maximize the
  FIS throughput numbers.
  
   1.  Priority relationships between CPCS 1.11 /
       CIMS Primary / CIMS Secondary/ and Format
       Image Statements.
  
       CPCS 1.11 and the CIMS Primary communicate
       with each other and therefore should be set up
       with equal priority in the MVS/ESA operating
       system.  In addition their overall priority
       within the MVS/ESA operating system should be
       above average.
  
       CIMS Primary and CIMS Secondary communicate
       with each other, however due to the higher
       demand for CPU and I/O during the Capture
       Process (Secondary) the CIMS capture address
       space should have a priority one lower than
       CPCS 1.11 and CIMS Primary Address Space.
       This will prevent the CIMS Capture address
       space from preempting the CPCS 1.11 and CIMS
       Primary Address spaces.
  
       The priority for the Format Image Statements
       should be one lower than the CIMS Primary.
  
    2.  Isolate all files (including MIPF, ASF, PGM
        STATS) to unique DASD units.  Do the same for
        work files if you are not using Virtual Input/
        Output.
  
    3.  Use Virtual Input / Output for work files.
        (VIO)
  
    4.  Use BUFNO=25 parameter on the DCB Keyword in
        the Run JCL for Statement Print File, Merge Image Print
        File and Suspense File.
  
    5.  Increase region size to 0 Meg.  This will
        request all available memory.
  
    6.  Use 3 or 4 subtasks per Image processor for
        maximum IP utilization.
  
    7.  For System utilization assume ...
  
         a.  7.0 Meg. Virtual Memory Per Subtask.
  
         b.  0.5 Meg. Real Memory Per Subtask.
  
         c.  0.5 Meg. Virtual Memory Once Per FIS JOB.
  
         d.  1.5 MIPS Per Subtask.
  
     8.  Use a large (TRK) Control interval size for
         the Account Summary File unless SIS contention
         is a problem.
  
     9.  If DLIP Resend messages are being received in
         the JES Log, make the following changes in your
         ALS MACRO - ELRXMBEG (The channel interface
         configuration table begin macro.)
  
         a.  ELRXIASZ - from 40 to 24.
  
         b.  ELRXIBSZ - from 40 to 24.
  
     10. If you have multiple 3898 Image Processors,
         set up LAN Communications record sysin file (LANCOM) for
         maximum utilization of each IP.  The FIS task controller
         assigns each subtask an IP to use by using the LANCOM
         field 'HPS004-FIS-LANCOM-IPU-INFO'.  Each subtask will
         be assigned the next IP in the array.  If not enough IPs
         are listed, the first IP will be assigned to the
         remaining subtasks.  Therefore, specify enough IPs in the
         array as you have subtasks.  Listing extra IPs
         will cause no harm.
  
         For example, if you have two IPs (PU000001 and PU000002)
         5 FIS subtasks and a application host logical unit number
         'STMTAHLU', the following is an efficient LANCOM:
                 |        |        |        |        |
         STMTAHLU|PU000001|PU000002|PU000001|PU000002|PU000001
  
     11. Make sure that all like Produce Codes (denoted in the hea
         markers) are grouped together in the Statement Print File
         Grouping statements will reduce the number of DB2 calls.
  
     12. Output of FIS (Merged Image Print File) can be written to
         DASD instead of JES (i.e. make sure they are writting to
         a file and not SYSOUT).  Keep in mind that this will incr
         performance for the FIS run, but the time to spool this f
         to print will still take time).
  
     13. 486 upgrade: should see a 33% increase in the # of images
         processed).
  
     14. VIO for workfiles: 5 - 10% increase.
  
     15. For printing:
         DASD Fast Write / use of Cache: this affects spool time.
         TRKCELL = 10: provides a significant increase for despool
         time.
  
  
  568815701, 568815702, FIS, PERFORMANCE, THROUGHPUT
  STATEMENTS
  

Local fix

Problem summary

Problem conclusion

Temporary fix

Comments

• TIPS TO HELP CUSTOMERS FINE-TUNE HPTS STATEMENTS
  FIS PERFORMANCE
  

APAR Information

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

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

Fix information

Applicable component levels