From: Eric Brown <ecbrown@ericcbrown.com>
To: "Ludovic Courtès" <ludovic.courtes@inria.fr>
Cc: guix-devel <guix-devel@gnu.org>
Subject: Re: LAPACK vs. OpenBLAS
Date: Thu, 24 Jun 2021 10:00:41 -0500 [thread overview]
Message-ID: <87k0mj71eu.fsf@ericcbrown.com> (raw)
In-Reply-To: <87wnqjs9qv.fsf@inria.fr> ("Ludovic Courtès"'s message of "Thu, 24 Jun 2021 14:55:04 +0200")
Ludovic Courtès <ludovic.courtes@inria.fr> writes:
> Hello!
> There are two cases:
>
> 1. Packages that depend on both ‘lapack’ and ‘openblas’. This is
> almost always a mistake because ‘openblas’ provides the same
> interfaces as ‘lapack’, only with a more efficient implementation.
>
> 2. Packages that depend on ‘lapack’ only: for the same reason, they
> should depend on ‘openblas’ instead.
My understanding is that Julia 1.6 (already released) requires 64-bit
BLAS, and openblas-ilp64 should do the trick.
There are scenarios where reference BLAS is more stable and/or
reproducible than optimized BLAS libraries. Sometimes its lack of
knowledge of OpenBLAS and/or a numerical issue.
(cf. GNU R's discussion of which BLAS to use.)
next prev parent reply other threads:[~2021-06-25 10:32 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-24 12:55 LAPACK vs. OpenBLAS Ludovic Courtès
2021-06-24 13:58 ` zimoun
2021-06-24 15:00 ` Eric Brown [this message]
2021-06-29 14:38 ` Ludovic Courtès
2021-06-29 16:00 ` Eric Brown
2021-06-29 16:13 ` Eric Brown
-- strict thread matches above, loose matches on Subject: below --
2021-08-06 12:32 Paul Garlick
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