RE: Divide by zero monitoring

[rob@xxxxxxxxx]

The longest time factor I had in using subprocedures was allowing huge
strings.  And it specifically had to do with using XLATE.  My subprocedure
would capitalize up to a 32,000 byte string.  I ended up using inline code.
However, I suspect that if the variables were the same size and only as
large as necessary my time would have been much, much shorter.
You said 26 times faster.  I experienced 22 times faster.  We're pretty
close there fella.

Rob Berendt
--
"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety."
Benjamin Franklin



                    "Bob Cozzi
                    \(RPGIV\)"              To:     <rpg400-l@midrange.com>
                    <cozzi@rpgiv.com>       cc:
                    Sent by:                Fax to:
                    rpg400-l-admin@mi       Subject:     RE: Divide by zero 
monitoring
                    drange.com


                    03/04/2002 04:25
                    PM
                    Please respond to
                    rpg400-l






Let's not forget, that there is overhead involved in calling a
procedure!
I ran a test using the XLATE operation in my TOUPPER()
procedure/function. It took 26 times longer to run the code in a
procedure than it did as in-line code. Now, that's a couple lines of
code vs a procedure wrapper for that same few lines of code.  Of course
if you put 100 lines of code into a procedure, the overhead isn't going
to increase, it'll stay the same.

Until IBM adds a "Inline" keyword to procedures, use of procedures for
certain time-critical things (like math) might be better left on the
wish list.


Specs:

Called the procedure 30000 times
vs.
Inline XLATE and SUBST opcodes.

Procedure was approximately 14.17 units of measure.
Inline code was 0.02 units of measure.

So the overhead for a procedure call is X where X = approx. 13.8 units
of measure regardless of the size of the procedure.

Bob Cozzi
cozzi@rpgiv.com
Visit the on-line  Midrange  Developer  forum at: http://www.rpgiv.com


> -----Original Message-----
> From: rpg400-l-admin@midrange.com [mailto:rpg400-l-admin@midrange.com]
On
> Behalf Of Reeve Fritchman
> Sent: Monday, March 04, 2002 2:58 PM
> To: rpg400-l@midrange.com
> Subject: RE: Divide by zero monitoring
>
> This is a great application for a subprocedure:    EVAL RESULT  =
> DIVIDE(FACTOR1:FACTOR2)
>
> -----Original Message-----
> From: rpg400-l-admin@midrange.com
[mailto:rpg400-l-admin@midrange.com]On
> Behalf Of jpcarr@tredegar.com
> Sent: Monday, March 04, 2002 3:44 PM
> To: rpg400-l@midrange.com
> Subject: Re: Divide by zero monitoring
>
>
> Ya,  you have to test for it
>
>
>  C                   IF                      (TOT <> 0)
> C                   EVAL(H)   PARR(OC)   =  ((PTRUNHR/TOT) * 100)
> C                   ELSE
> C                   EVAL      PARR(OC)  =   0
>
> John Carr
>
> ---------------
> For the EVAL statement, is there a way to monitor for divide by zero
> errors?
> We just want to ignore the statement then continue on. Or will I have
to do
> an ol' fashioned IF statement?
>
> Thanks,
>
>
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