RE: RPG Performance question

David,

You're always using activation groups - even if it's the default activation group. Mark, Simon, or Scott could give a better explanation of how this impacts performance since, as you say, the files are not (usually) closed manually, and it appears that you are using the default AG.

Jerry C. Adams
IBM System i Programmer/Analyst
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-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of David FOXWELL
Sent: Monday, December 28, 2009 11:03 AM
To: RPG programming on the IBM i / System i
Subject: RE: RPG Performance question

-----Message d'origine-----
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] De la part de Bryce Martin

Specifying USROPN for your files and then doing a check to
see if the file is open already using the following code can
save you a ton of processing time. Opening and closing files
all the time can be very expensive especially for
modules/procedures that are very detailed and called a lot.

if not %open(filename);
open filename;
endif;

That is used quite a lot, though rarely are the files manually closed again.

I use some code from Scott in my module source that checks
for open files when the activation group is destroyed and the
service program's storage is reclaimed.

I remember that one, it was in an article on MVC I believe. But activation groups are rarely used here. At the moment.