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Re: Automatic parallelization in 4.3?

From: "Finch 888" <finchlady888 at hotmail dot com>
To: fortran at gcc dot gnu dot org
Date: Wed, 25 Oct 2006 17:59:43 -0400
Subject: Re: Automatic parallelization in 4.3?
Bcc:

From: Tobias Burnus <burnus@net-b.de>
(I don't know how well -ftree-parallelize-loops will work, but the
autoparallelization in ifort made one of my programs actually slightly
slower (on a dual-core AMD) than a single process [I don't know how
typical this is]. However, it is nice that GCC will have it.)

Tobias

Don't expect too much on auto-parallelizer. Parallel code does not guarantee a faster solution unless the parallel code is well programmed in efficient parallel algorithm. There is no surprise that multi-threaded application is slower than a sequential version.

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References:
- Re: Automatic parallelization in 4.3?
  - From: Tobias Burnus

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