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[Fwd: OpenMP works great under MacOSX Intel but not all under Windows (MinGW)]
- From: Tobias Burnus <burnus at net-b dot de>
- To: "'fortran at gcc dot gnu dot org'" <fortran at gcc dot gnu dot org>
- Date: Wed, 11 Jul 2007 09:50:13 +0200
- Subject: [Fwd: OpenMP works great under MacOSX Intel but not all under Windows (MinGW)]
Question posted to gnu-fortran@googlegroups.com
http://groups.google.com/group/gnu-fortran/
Maybe you have an idea.
Tobias
-------- Original message --------
Subject: OpenMP works great under MacOSX Intel but not all under
Windows (MinGW)
Date: Sun, 08 Jul 2007 08:33:17 -0700
From: Al Greynolds <awgreynolds>at<earthlink>dot<net>
I have a MacBooK Pro setup to dual boot MacOSX and WindowsXP Pro.
The OpenMP parallel portions of my Gfortran 4.3 compiled application
run great under MacOSX, i.e. nearly twice as fast on the dual core
Intel processor. However, when I compile and run it under Windows XP
using the latest July 6 Windows gfortran binary, task manager shows
only 50% CPU useage and the execution is actualy 50% slower than a G95
(experimental 4.1 MinGW) version that does not support OpenMP.
Is OpenMP expected to work with the Gfortran under Windows?
Al
-----------------------
Follow up:
After a little digging, I noticed that last year a special Windows
binary of gfortran with OpenMP support was available. Does a more
recent one need to be built? If so, why isn't there just one
regularly updated binary (like the other platforms) that has OpenMP
support included?
Al