RE: "Constant" performance question

Jerry,

I haven't been following this thread and my intent is not to co-opt the topic. I do want to respond to your comments about the subfile thread though to add some clarity.

I agree with you that if the difference is negligible why waste time worrying about it. The reason I asked the question is that this came up in a standards committee meeting. As drafted the standard in question states that the rolling function for subfiles will be handled by the developer in the program. The real issue isn't to determine how much faster either method is than the other. Rather, it is, to me anyway, one of making the developers job easier and helping them be more productive.

Rick

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Jerry Adams
Sent: Thursday, February 18, 2010 9:02 AM
To: RPG programming on the IBM i / System i
Subject: RE: "Constant" performance question

Plus isn't it more important that the code be productive from both a programmer- and user-point-of-view? Unless I find (or have reported to me) significant issues with performance, I try (not always successfully it turns out) to write code that (a) the next programmer can most easily decipher (even though this is a one-man System i-wise shop), and (b) gives the user/client that easiest path to their objective. Those that dwell upon nano- or micro-second issues have more important issues that they need to address.

As an example, the other discussion about subfile performance seems a little ridiculous to me. On the original AS/400 models there is a significant difference between page-at-a-time and load-all subfiles. At least since the Power4 chip the difference is negligible; loading a 1000+ load-all subfile (never had to go the full limit), is still sub-second response. And, in my opinion, writing a load-all is a heck of a lot easier to write and understand than a page-at-a-time. Since it's not a programmer issue, if it ever becomes an issue with the user/client, I would have to revisit that premise, but a couple of micro seconds is not something I am going to address.

Jerry C. Adams
IBM System i Programmer/Analyst
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email: jerry@xxxxxxxxxxxxxxx


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