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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
> <http://fftw.org/fftw3_doc/Installation-on-Unix.html>, 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.
[1]
https://users.ugent.be/~kehoste/eum18/eum18_easybuild_past_present_future_20180130.pdf
> 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,
simon