all messages for Guix-related lists mirrored at yhetil.org
 help / color / mirror / code / Atom feed
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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=87sh883gko.fsf@gnu.org \
    --to=ludovic.courtes@inria.fr \
    --cc=bavier@cray.com \
    --cc=guix-devel@gnu.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
Code repositories for project(s) associated with this external index

	https://git.savannah.gnu.org/cgit/guix.git

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.