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Re: Guix-HPC activity report

From: zimoun
Subject: Re: Guix-HPC activity report
Date: Fri, 22 Feb 2019 16:41:23 +0100

Hi Ludo,

Thank you for your precision.

On Fri, 15 Feb 2019 at 18:09, Ludovic Courtès <address@hidden> wrote:
> zimoun <address@hidden> skribis:
> > Well, is it still accurate ?
> > Is Guix binary still slower than other ?
> The comment links to
> <>, which reads:
>   Enable various SIMD instruction sets. […] FFTW will try to detect at
>   runtime whether the CPU supports these extensions.  That is, you can
>   compile with --enable-avx and the code will still run on a CPU without
>   AVX support.

If I understand well, the claims p.45 of the EasyBuild presentation
[1] should not true any more.
Because there is a factor 2+ with their benchmarks.


> So I believe the numbers one gets with the ‘fftw’ package in Guix are
> the best one can get because FFTW does the right thing of using the
> right version of its hot functions at run time.  (That said, you can
> redo the benchs, and if this is not the case, it’s a bug! :-))

A benchmark from "our side" should be informative. :-)
But I am not sure that I would like to dive in EasyBuild stuff... ;-)

Thank you again !
All the best,

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