Re: Suggestions on Speeding up a program

Eliminate redundant I/O:

If your program is reading a "primary" file and then using CHAIN (or SETLL along with READ or READE) to randomly retrieve values from various other "secondary" files, put a block of logic around each of the secondary I/O operations such that it will only retrieve the value from the "secondary" files if the key value changes.

JDE example:

(F4211 contains SDCO, which is the key for F0010)

Read I4211;
Dow not %eof( F4211 );

If SDco <> svco;
chain ( SDco ) i0010;
svco = SDco;
EndIf;

// do other stuff here...

Read I4211;
EndDo;


- sjl


"RPGLIST" wrote in message news:mailman.7523.1357227592.10847.rpg400-l@xxxxxxxxxxxx...

I'm looking for any and all suggestions on possible ways to speed up some
programs.

The typical ones that come to mind are:

1. avoiding open and closes on files
2. Not setting LR when calling a program or procedure multiple times
3. using Data structures for block reads and writes

Any other suggestions?