Re: Resetting %EOF

[Hans Boldt <boldt@xxxxxxxxxx>]

Bob Cozzi wrote:
> Great idea Scott!
> But remember, there is a lot of overhead in a procedure call (relative
> to a straight, in-line opcode) so you will add to the time it takes to
> retrieve the database records; if that's an issue with the code, the
> you'd want to avoid wrapping it into a procedure.

Sure, procedure calls have their overhead.  But the overhead behind
I/O operations is normally several orders of magnitude greater.

If wrapping an I/O operation in a procedure makes for more
maintainable code, then that's a very worthwhile trade-off, IMHO.

> Ah, yet another reason why the INLINE keyword is needed on Procedure
> specs....

Performance is a funny topic.  In I/O bound applications (as are
most RPG apps), there is relatively little to be gained by specific
optimizations.  The biggest gains are normally found by looking at
overall algorithms, especially as they relate to I/O.

In-lining, in particular, *may* provide some benefit, but on the
other hand, it would also typically increase the size of the program
object, which may adversely affect the paging characteristics of the
program.

Performance is always a tricky issue.  Personally, I've tried code
changes intended to improve performance only to be hit by even worse
bottlenecks elsewhere!

Hans