Re: Suggestions on Speeding up a program

[Henrik Rützou <hr@xxxxxxxxxxxx>]

There is no reason to try to optimize a reasonably well written RPGLE
program. On an IBM I 720 with RAID and 4 disks most of what the power 7
processor does in a normal IBM I application environment is waiting for
disk I/O.


On Fri, Jan 4, 2013 at 4:08 PM, Jon Paris <jon.paris@xxxxxxxxxxxxxx> wrote:

> Noooooooooooooooo !  Never ever sacrifice readability and maintainability
> for performance unless it is absolutely the only answer left.
>
> Besides - If you use optimization then the smaller the "bits" the more it
> can do for you to improve performance. It will literally move code around
> to ensure that routines that operate together are in memory together.
>
> Talking of optimization - using optimization based on run-time performance
> collection data can also have a big impact.
>
>
> On 2013-01-04, at 4:43 AM, rpg400-l-request@xxxxxxxxxxxx wrote:
>
> > I would also reduce the number of jumps in the program, i.e. reduce the
> > number of functions / subroutines, put more into one, it's messy, but
> > should gain some speed.  Keep the most frequently used functions /
> > subroutines closer to the body of the program.
> >
> > Use program optimization.
>
> Jon Paris
>
> www.partner400.com
> www.SystemiDeveloper.com
>
>
>
>
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