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Re: Compiling with and without -march=native: benchmarks

From: Jaroslav Hajek
Subject: Re: Compiling with and without -march=native: benchmarks
Date: Mon, 21 Sep 2009 11:44:18 +0200

On Mon, Sep 21, 2009 at 11:29 AM, Corrado <address@hidden> wrote:
> On Monday 21 September 2009 10:21:46 Jaroslav Hajek wrote:
>> benefits. Did you include -march=native in FFLAGS?
> yes
>> It's not that hard, but regarding the BLAS, it makes little sense to
>> do so with the reference BLAS implementation. A tuned implementation
>> such as ATLAS or some of the non-free ones will bring you much better
>> speed.
> yes, I have atlas. I try not to use non free (as in speech) software. So these
> are benchmarks carried out with purely free software / open source software.

A self-compiled ATLAS? That is typically faster, because it will adapt
to your machine better.
In general, ATLAS will be able to discover your machine's capabilities
itself, so there's little need to specify performance flags.

RNDr. Jaroslav Hajek
computing expert & GNU Octave developer
Aeronautical Research and Test Institute (VZLU)
Prague, Czech Republic

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