Re: Program performance using File Status Data Structure

[Anton Gombkötö <Gombkoetoe@xxxxxxxxxx>]

At 10:54 06.10.00 -0500, you wrote:
>Does anyone know if it slows down program performance by including a File
>Status Data Structure within the F-Specs?
>If we are not using any of the information from the File Status Data
>Structure should we avoid including it within the program?

I think i once read that there is a performance loss when you code an INFDS 
that is longer than 80 bytes. (But that can be a S/36 info, too, so don't 
count on it)

I tried to look this up in the RPG/400 Reference and the ILE RPG for AS/400 
Reference, but wasn't able to. But i found the sentence that the infos of 
the file feedback section are available via a DUMP. These are the first 80 
bytes.

If you don't need it, why code it? If you ever decide to use it, the lines 
are easily included (again). It would confuse me when someone codes 
something that isn't used. I'd think i oversaw something.

On the other hand, i do not hesitate to code an INFDS whenever i need it, 
regardless of how much milliseconds i'd loose. Somewhere in the RPG 
handbook is a sentence "a function call takes about 1000 times more time 
than an EXSR". I am not able to measure the difference. (not because i'm a 
XXXthree_pepperoni_wordXXX [i'm using Eudora 5.0 :-], but as it makes 
absolutely no significant difference). We all are writing software for the 
machines of today and tomorrow, so let's forget about these things. One can 
gain much more performance (for all users on the machine) by avoiding 
unnecessary disk I/O. That (and the general logic, of course :-) are points 
that deserve time for investigation of performance wins.

0.02 Euro



Mit freundlichen Grüssen / best regards

Anton Gombkötö

e-mail Office   :       mailto:Anton.Gombkoetoe@avenum.com
Homepage        :       http://www.avenum.com

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