Re: Expensive op codes

["Peter Dow" <pcdow@xxxxxxxxx>]

> Exactly Wynn.     CLEAN, READABLE, MAINTAINABLE, RELIABLE, CONSISTENT,
> STANDARDIZED CODE.
>
> Design first for the above,   Adjust for for performance only if
necessary.
>
> John Carr

I also agree. My intent in starting this subject was to find out what things
are important when adjusting for performance, just how important they are,
and if the faster way is clean, readable, etc., use it as my standard.
Another point I'd like to make is that the things that are important for
performance change slightly as the years go by and IBM tweaks the compiler
or the hardware.

As I mentioned in an earlier post, I fail to see why READE and READ/compare
are so different. They are both doing sequential reads (last time I checked
<g>) and then comparing some key fields to determine whether to use the
record or not. I would like to think that it's possible for the READE code
to read a block of records just as READ does, and look at each record within
the block to do it's compare before either passing the record to the program
or setting the = indicator. This is something that could be tweaked by IBM
at any time.

I also like the info about the COBOL run unit. It's been 6 or 7 years since
I had a customer who used COBOL, and I never ran across that problem. Good
to know.

Peter Dow
Dow Software Services, Inc.
909 425-0194 voice/fax


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