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Newsgroups: comp.lang.fortran
From: nos...@see.signature (Richard Maine)
Date: Wed, 18 Jun 2008 08:34:23 -0700
Local: Wed, Jun 18 2008 11:34 am
Subject: Re: Global array operations: a performance hit?
deltaquattro <deltaquat...@gmail.com> wrote: As long as I'm being mentioned by name, I'll note that I thought I was > On 17 Giu, 19:21, Dennis Wassel <dennis.was...@googlemail.com> wrote: > > On 17 Jun., 17:41, deltaquattro <deltaquat...@gmail.com> wrote: > > 3) How did you measure execution time? > > I find that accuarate timing on a computer is a nontrivial task. The > > 'time' command on my machine shows up to 200% variance. I can only > > assume you used some clever and appropriately precise way of > > measuring. > When Richard told you exactly the same, you didn't ask which "clever agreeing with Dennis on this particular point/question. I don't recall answering it at all, but rather reinforcing it when I said: >>> As Dennis says, it can be tricky to even measure execution times I did disagree on other points, including the larger one about array >>> precisely enough to time initializations like this. operations often being slower (or not). But for the specific case here, where it is just an initialization, and thus presumably pretty quick, I had exactly the same question, even if I stated it implicitly instead of with a question mark. I just didn't really need to ask because I agreed with your (deltaquattro's) general observation, even though I wondered about how this particular case was measured. -- You must Sign in before you can post messages.
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