The options in the following list are normally passed as PARMs for performance tuning. Complete information on these options is given earlier in this chapter unless otherwise noted in the list.
- Optimization modes
You may pass one of four PARMs to reset MFX’s optimization mode. BALANCE tells MFX to provide the best balance of CPU time, sort elapsed time, and I/O activity. CPU tells MFX to minimize CPU time, ELAP tells MFX to minimize elapsed time, and IO tells MFX to minimize its I/O activity. For a complete explanation of these values, see DSM and DSMWEND Options.
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BMSG
Passing this PARM causes MFX to print a number of optional B-type messages, which are useful for tuning purposes.
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STATREC
A PARM of STATREC=SYNCSTAT directs MFX to produce a formatted report of its SMF data. The delivered default (SYNCSMF) disables the generation of this report.
STGPCT
STGPCT sets the maximum percentage of available storage that MFX can use for processing and overrides the value specified in the fifth subparameter of the SYNCMAC DSM and DSMWEND options. Specify STGPCT=n where the valid range of n is from 1 through 95. This parameter is ignored if the SYNCMAC installation option DSMALTST is set to NO.
No messages are generated if this parameter is disabled or limited by installation defaults.- VSCORE
VSCORE sets the maximum amount of virtual storage below the 16-megabyte line that MFX can use for its working set. Virtual storage can be specified in bytes (nnnnnnnn), kilobytes (nK), or megabytes (nM).
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VSCORET
VSCORET sets the maximum amount of virtual storage below and above the 16-megabyte line that MFX can use for its working set when DSM is inactive. Virtual storage can be specified in bytes (nnnnnnnn), kilobytes (nK), or megabytes (nM).