RE: RPG IV Performance

[Buck Calabro <buck.calabro@xxxxxxxxxxxxxxxxx>]

Lisa Abney wrote:

>Hi all!  I've just heard some rather negative 
>performance things on RPG IV, and
>wonder if anyone can give me some 
>feedback on how true this might be.
-snip-
>The program they showed me was written in RPGIII, 
>and I made my usual request to an outside contractor 
>that this be done in RPGIV.  His response was "Sure, if
>you want the program size to be 5 - 10 times the size 
>of an RPGIII program."  When I asked him to explain 
>that, he only said that, in his experience, this is
>always true, and that it would have a very negative performance.

I have found that simply converting to RPG IV and re-compiling gives my
programs a 10-20% speed increase.
As for the size of the object, I took an old-ish RPG III program with 222
lines and compiled it - 81920 bytes.  I then ran it through the IBM
CVTRPGSRC and compiled it dbgview(*none) dftactgrp(*yes) - 131072 bytes.
With dbgview(*list) - 225280 bytes.

I'm a bit surprised that a performance consultant hasn't suggested
benchmarking the performance...

Buck Calabro
Aptis; Albany, NY
"Nothing is so firmly believed as
 that which we least know" -- Michel Montaigne
Visit the Midrange archives at http://www.midrange.com

> -----Original Message-----
> From: Lisa.Abney@universalflavors.com 
> Sent: Friday, January 19, 2001 8:07 AM
> To:   RPG400-L@midrange.com
> Subject:      RPG IV Performance
> 
> 
> 
> Hi all!  I've just heard some rather negative performance things on RPG
> IV, and
> wonder if anyone can give me some feedback on how true this might be.
> 
> We're working with a consulting company who is doing some performance
> analysis
> on some of our programs.  They seem very knowledgeable, and I have a lot
> of
> confidence in what they've done up until now.  However, today they were
> showing
> us a mock-up of a trigger program they want to use.  As they explained it,
> this
> trigger program will be constantly running in the background for every
> user on
> the system to monitor changes to two files, and will feed data to a
> dataque.
> The program they showed me was written in RPGIII, and I made my usual
> request to
> an outside contractor that this be done in RPGIV.  His response was "Sure,
> if
> you want the program size to be 5 - 10 times the size of an RPGIII
> program."
> When I asked him to explain that, he only said that, in his experience,
> this is
> always true, and that it would have a very negative performance.  I even
> mentioned removing observability (not that I really understand what that
> means,
> but I just read something the other day about that being a way to reduce
> program
> size!), and he said that might move it down to 3 - 5 times the size of an
> equivalent RPGIII program.  The program will only be about 50 - 100 lines
> of
> code.
> 
> Can someone explain if this is true, and, if so, why?  And, if true, what
> does
> this really mean from a performance standpoint?
> 
> 
> 
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