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Newsgroups: comp.lang.fortran
From: deltaquattro <deltaquat...@gmail.com>
Date: Wed, 18 Jun 2008 01:20:25 -0700 (PDT)
Local: Wed, Jun 18 2008 4:20 am
Subject: Re: Global array operations: a performance hit?
On 17 Giu, 19:21, Dennis Wassel <dennis.was...@googlemail.com> wrote:
> On 17 Jun., 17:41, deltaquattro <deltaquat...@gmail.com> wrote: None. [..] > This is quite a strange observation and raises some questions: > 1) What optimisation options did you use? > 2) Which compiler did you use? Compaq Visual Fortran. > 3) How did you measure execution time? and appropriately precise way of measuring" he used, but you quickly thanked him for "enlightening us". I can only assume that for you using "some clever and appropriate precise way of measuring" means asking for Richard's agreement on the subject. > I'm not a compiler specialist but AFAIK, array operations should not Well, then you could just try some example for yourself and see what > usually be slower than explicit loop constructs. happens. My experience comes from different CFD codes I wrote using whole array operations and single DO loops, and with my compiler I often found significant execution time differences in real life codes on real life cases. That's enough for me to start asking questions on the ng, and yes thanks, I know enough Fortran to reverse index ordering outside initialization loops: that was just an example. > Cheers, deltaquattro You must Sign in before you can post messages.
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