Re: UP vs UF

[bmorris@xxxxxxxxxx]

boothm@earth.goddard.edu wrote:
> Does Barbara have any info to share on UP to a sequential file vs. a
> roll-your-own-cycle job?

Booth,
There's very little (if any) difference in performance between UP
and UF.  There's no magic in the RPG cycle that makes it able to
read and update records any faster than a loop with READ and UPDATE
or EXCEPT opcodes.  Same with IP/IF (as long as the IF file is
blocked).

I just ran a little test and coding my own loop to read and update
was a tiny bit faster (40 seconds for the cycle and 39 seconds for
my code).  This is insignificant as far as saying "don't use the
cycle"; rather it indicates that choosing between UP and UF should
be based on considerations other than performance.

Barbara Morris


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