Re: ifort and CVF

From: andy2o (andy2O_at_hotmail.com)
Date: 09/01/04 

Date: 1 Sep 2004 08:39:30 -0700

Gib Bogle <bogle@ihug.too.much.spam.co.nz> wrote in message news:<ch408v$7s8$1@lust.ihug.co.nz>...
 
> The only thing that would persuade me to make the
> change is a clear performance improvement in solving flow problems using
> finite elements. Am I likely to get this?
>
> Thanks
> Gib

Intel provide a free trial of ifort available at www.intel.com, so why
not do some benchmarking of your code? That has to be the best way to
see if *your* code will benefit.

I can say is that ifort for Linux has beaten the other compilers I use
by a large margin for most of the mathematical codes I've used it for
(I've never had a chance to use CVF).

However it will also depend whether your core computation routines
(usually linear system solvers from libraries for me) will benefit.
Two examples:

1)I use GOTO's optimised BLAS library in many programs - that library
is already highly optimised and most of my code's time is spent in
calls to library routines. Because of this the surrounding code (which
is the only bit I actually compile) does little of the hard work and
differences between compilers have little effect.

2)All compilers seem to do well on my Lattice Boltzman CFD code - the
main computational routine is simple enough that they all get it
right.

HTH
Andy

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