From: Pjotr Prins <pjotr.public12@thebird.nl>
To: Dave Love <fx@gnu.org>
Cc: guix-devel@gnu.org
Subject: Re: OpenBLAS and performance
Date: Wed, 20 Dec 2017 18:22:15 +0100 [thread overview]
Message-ID: <20171220172215.GA7926@thebird.nl> (raw)
In-Reply-To: <87h8sl78vp.fsf@albion.it.manchester.ac.uk>
On Wed, Dec 20, 2017 at 02:48:42PM +0000, Dave Love wrote:
> I wrote:
>
> > If you do provide some sort of threaded version for Python, then as far
> > as I remember it must use pthreads, not OpenMP, though you want the
> > OpenMP version for other purposes, and I hadn't realized there wasn't
> > one currently.
>
> I was confused. I see the only version of the library shipped is built
> with pthreads. I think there should be serial, pthreads, and OpenMP
> versions, as for Fedora. It may also be useful to provide the 64-bit
> integer versions, like Fedora; that's useful for at least a flagship
> chemistry program.
I was just stating that the default openblas package does not perform
well (it is single threaded, for one). If I compile for a target it
makes a large difference. I don't know how we can make that available
to others apart from having special packages like the one I made.
Looks to me like python-numpy could benefit, but how we deploy that as
a flavour - I have no idea.
> I also remembered the problems with 0.2.20. I'll send a patch for the
> wrong cache size used on some x86_64 when I get a chance.
It is a stable release. So far no problems on my end using the latest
git checkout of openblas.
Pj.
--
next prev parent reply other threads:[~2017-12-20 17:25 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-19 10:49 OpenBLAS and performance Pjotr Prins
2017-12-19 17:12 ` Ludovic Courtès
2017-12-20 11:50 ` Dave Love
2017-12-20 14:48 ` Dave Love
2017-12-20 15:06 ` Ricardo Wurmus
2017-12-22 12:24 ` Dave Love
2017-12-20 17:22 ` Pjotr Prins [this message]
2017-12-20 18:15 ` Ricardo Wurmus
2017-12-20 19:28 ` Pjotr Prins
2017-12-20 20:00 ` Ricardo Wurmus
2017-12-20 20:32 ` Pjotr Prins
2017-12-20 19:02 ` Eric Bavier
2017-12-21 16:38 ` Dave Love
2017-12-20 23:02 ` Ricardo Wurmus
2017-12-21 10:36 ` Pjotr Prins
2017-12-21 14:43 ` Ludovic Courtès
2017-12-22 14:35 ` Dave Love
2017-12-21 16:17 ` Dave Love
2017-12-21 16:46 ` Ricardo Wurmus
2017-12-21 14:55 ` Ludovic Courtès
2017-12-22 12:45 ` Dave Love
2017-12-22 15:10 ` Ludovic Courtès
2017-12-22 16:08 ` Pjotr Prins
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