Re: Multiply Versus Divide

[rob@xxxxxxxxx]

Ah, there's the rub "... wherever it makes sense."  That's the part open 
to human emotions.

Some might change from a DIV to a MULT to save .005 seconds on a 5 million 
record process.  Those same won't change from RPG file handling to SQL 
handling to shave a minute off that same process, even if they're the ones 
that ran the time trials and found the better performance did come from 
SQL.

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





"Bill" <billzbubb@xxxxxxxxxx>
Sent by: rpg400-l-bounces@xxxxxxxxxxxx
08/15/2003 01:13 PM
Please respond to RPG programming on the AS400 / iSeries
 
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        Subject:        Re: Multiply Versus Divide



Scott Klement wrote:
>> My experience is like Bill's.  If the program is a heavy hitter and
>> you can easily keep DIV out of the code its worth it.

> This means that if you had code that does ONE MILLION divides, you
> would waste about 14 seconds.
>
> It's definitely not worth making your code harder to read to save 14
> seconds per day in some big million record processing batch job.

While I agree with the statement about not making code harder to read, I
will disagree that the code is harder to read just because it uses 
Multiply
instead of Divide.

> In any application you write where you "save time" by using MULT
> instead
> of DIV, I can almost guarantee that there's something else in that app
> that's wasting more time than the difference between MULT and DIV.

Maybe true, but I think time should be saved wherever it makes sense.

Bill


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