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From: ludovic.courtes@inria.fr (Ludovic Courtès)
To: Eric Bavier <bavier@cray.com>
Cc: guix-devel@gnu.org
Subject: Re: fftw runtime cpu detection
Date: Fri, 06 Apr 2018 10:05:43 +0200	[thread overview]
Message-ID: <87sh883gko.fsf@gnu.org> (raw)
In-Reply-To: <20180405221329.GT105827@pe06.us.cray.com> (Eric Bavier's message of "Thu, 5 Apr 2018 17:13:29 -0500")

Hello Eric,

Eric Bavier <bavier@cray.com> skribis:

> I recently discovered that the FFTW library can do runtime cpu
> detection.  In order to do this, the package needs to be configured to
> build SIMD "codelets", like how our 'fftw-avx' currently does.  Then,
> based on the instruction support detected at runtime, make those
> kernels available to the fftw "planner" for execution.

That’s really good news!  Thanks for testing it.

The patch LGTM.  Can you confirm that the planner won’t ever try to use
the AVX2 codelets, for instance when running the test suite on an x86_64
box that lacks AVX2?

If that’s the case, I’d be in favor of pushing this patch to core-updates.

Thanks,
Ludo’.

  parent reply	other threads:[~2018-04-06  8:05 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-05 22:13 fftw runtime cpu detection Eric Bavier
2018-04-06  7:54 ` Chris Marusich
2018-04-06 15:08   ` Eric Bavier
2018-04-06  8:05 ` Ludovic Courtès [this message]
2018-04-06 15:02   ` Eric Bavier
2018-04-06 15:09     ` Ludovic Courtès
2018-04-06 18:37       ` Marius Bakke
2018-04-17 21:29         ` Eric Bavier
2018-04-18 21:36           ` Ludovic Courtès

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