From: ludo@gnu.org (Ludovic Courtès)
To: Pjotr Prins <pjotr.public12@thebird.nl>
Cc: guix-devel@gnu.org, Dave Love <fx@gnu.org>
Subject: Re: OpenBLAS and performance
Date: Thu, 21 Dec 2017 15:43:16 +0100 [thread overview]
Message-ID: <87tvwk5egr.fsf@gnu.org> (raw)
In-Reply-To: <20171220192802.GA8426@thebird.nl> (Pjotr Prins's message of "Wed, 20 Dec 2017 20:28:02 +0100")
Pjotr Prins <pjotr.public12@thebird.nl> skribis:
> On Wed, Dec 20, 2017 at 07:15:16PM +0100, Ricardo Wurmus wrote:
[...]
>> The FAQ document[1] says this:
>>
>> The environment variable which control the kernel selection is
>> OPENBLAS_CORETYPE (see driver/others/dynamic.c) e.g. export
>> OPENBLAS_CORETYPE=Haswell. And the function char*
>> openblas_get_corename() returns the used target.
>>
>> [1]: https://github.com/xianyi/OpenBLAS/wiki/Faq
>>
>> Have you tried this and compared the performance?
>
> About 10x difference on 24+ cores for matrix multiplication (my
> version vs what comes with Guix).
Even when you use OPENBLAS_CORETYPE=haswell (lower-case?)?
That would be surprising: it’s the same code after all. The only
difference should be what happens at load time.
Ludo’.
next prev parent reply other threads:[~2017-12-21 14:43 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
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 [this message]
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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