Re: Suggestions on Speeding up a program

[Charles Wilt <charles.wilt@xxxxxxxxx>]

I assume these are batch programs?

Question: Are the files being written to journaled?  If so, are you using
commitment control?  If not, that is a _HUGE_ hit.  Unless you have the HA
Journal Performance, 5722-ss1 option 42, installed and being used which
allows for journal caching w/o commitment control. It was previously a
PPRQ.
Here's some good info: http://www.quser.org/Docs/JournalCaching.pdf

Here's some old but still valid info, "Optimizing Batch Performance" by
Rick Turner
http://www-01.ibm.com/support/docview.wss?uid=nas1e907e76673a614dd86256a290054f546

Here's the key take away, unless your CPU usage is at 100% during the
program run, your program is waiting (probably for disk I/O)...remove as
much wait as you can and if you're still not at 100%, break the job into as
many concurrent processes as needed to drive the CPU usage to 100%.

HTH,
Charles




On Thu, Jan 3, 2013 at 9:43 AM, RPGLIST <rpglist@xxxxxxxxxxx> wrote:

> I'm looking for any and all suggestions on possible ways to speed up some
> programs.
>
> The typical ones that come to mind are:
>
> 1. avoiding open and closes on files
> 2. Not setting LR when calling a program or procedure multiple times
> 3. using Data structures for block reads and writes
>
> Any other suggestions?
>
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