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Re: gfortran 4.2 with openMP: why no speedup?

From: "Anand Patil" <anand dot prabhakar dot patil at gmail dot com>
To: "Tim Prince" <tprince at myrealbox dot com>
Cc: gcc-help at gcc dot gnu dot org
Date: Sat, 12 Jan 2008 14:36:02 -0800
Subject: Re: gfortran 4.2 with openMP: why no speedup?
References: <2bc7a5a50801111707x4fedb999l7441e4bcde5e9c4e@mail.gmail.com> <2bc7a5a50801111718o6fb77b21yfd83638afa02e313@mail.gmail.com> <4788284F.2070108@myrealbox.com>

Tim,

> Do you expect your gfortran to interchange the loops?  Does it do it?
> Was this excerpt designed to prevent your current platform, whatever it
> may be, suffer in comparison with some other?

You're giving me way too much credit. :) I was just trying to figure
out OpenMP wasn't giving me any speedup over the serial version, but
in fact it was.

Re: your question, I exchanged the loops manually  and got much better
performance, so I'm guessing gfortran didn't exchange them.

Anand

Follow-Ups:
- Re: gfortran 4.2 with openMP: why no speedup?
  - From: Tim Prince

References:
- gfortran 4.2 with openMP: why no speedup?
  - From: Anand Patil
- Re: gfortran 4.2 with openMP: why no speedup?
  - From: Tim Prince

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