Re: Optimizing RPG programs

[David.X.Kahn@xxxxxxx]

Phil wrote:

> The RPG program was written several years ago and is still coded in OPM.

In my view JDE World is long overdue a conversion to ILE.

> This particular program does a lot of heavy array manipulation,

Does it use the standard I00DSINX or worse, performance wise, I00DSBIN copy
member for index definitions? You might get a further performance boost by
removing these copies and instead defining packed indices of the same size.
To do this you could create new copy members C55DSINX and C55DSBIN to be
included somewhere within subroutine S999. They might look like this:

     C*                 Packed Array Index Fields
     C*
     C*    This copy member should be placed in subroutine S999.
     C*    It replaces the binary field definitions in the data
     C*    structure in I00DSBIN with packed definitions.
     C*
     C                     Z-ADD*ZERO     #A      50
     C                     Z-ADD*ZERO     #B      50
     C                     Z-ADD*ZERO     #C      50
     C                     Z-ADD*ZERO     #D      50
     C                     Z-ADD*ZERO     #E      50
            <snip>
     C                     Z-ADD*ZERO     #M      50
     C                     Z-ADD*ZERO     #N      50
     C                     Z-ADD*ZERO     #O      50

and this:

     C*                 Packed Array Index Fields
     C*
     C*    This copy member should be placed in subroutine S999.
     C*    It replaces the zoned field definitions in the data
     C*    structure in I00DSINX with packed definitions.
     C*
     C                     Z-ADD*ZERO     #A      10
     C                     Z-ADD*ZERO     #B      10
     C                     Z-ADD*ZERO     #C      10
     C                     Z-ADD*ZERO     #D      10
     C                     Z-ADD*ZERO     #E      10
            <snip>
     C                     Z-ADD*ZERO     #X      40
     C                     Z-ADD*ZERO     #Y      40
     C                     Z-ADD*ZERO     #Z      40

I don't much care for packed fields with even numbers of digits, but this
gives you compatibility with the original field lengths.

Dave...

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