RE: RPG IV Performance

It appears that RPG IV program object size is larger than the original RPG III program.  RPG IV though runs faster than RPG III.  (I heard 20-30% faster though I have not personally benchmarked.)  Now if the trigger program sets on LR every call, Yes it will be slower.  Triggers should not ever set on LR unless told to do so via external switch, i.e. control data area.

Christopher K. Bipes    mailto:ChrisB@Cross-Check.com
Sr. Programmer/Analyst  mailto:Chris_Bipes@Yahoo.com
CrossCheck, Inc.        http://www.cross-check.com
6119 State Farm Drive   Phone: 707 586-0551 x 1102
Rohnert Park CA  94928  Fax: 707 586-1884

If consistency is the hobgoblin of little minds, only geniuses work here.  Karen Herbelin - Readers Digest 3/2000

-----Original Message-----
From: Lisa.Abney@universalflavors.com
[mailto:Lisa.Abney@universalflavors.com]
Sent: Friday, January 19, 2001 5:07 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?