[bug#49096] [PATCH] gnu: petsc: Link against OpenBLAS rather than LAPACK.

[zimoun <zimon.toutoune@gmail.com>]

Hi,

On Tue, 22 Jun 2021 at 09:31, Ludovic Courtès <ludo@gnu.org> wrote:
> Efraim Flashner <efraim@flashner.co.il> skribis:
> > On Fri, Jun 18, 2021 at 06:12:04PM +0200, Ludovic Courtès wrote:
>
> [...]
>
> >> Usually there’s no reason to depend on the reference (“Netlib”) BLAS/LAPACK
> >> implementations because they perform poorly.  This change is one way to
> >> bring consistency here.
> >>
> >> Thoughts?
> >>
> >> Ludo’.
> >
> > It sounds reasonable to me.
>
> Cool, thanks for taking a look.

LGTM.


> > As long as you're open to thoughts, perhaps we want to have a discussion
> > (in a new thread) about renaming the input labels for lapack/openblas so
> > it's easier to do 'guix build foo
> > --with-inputs=blas=openblas-tuned-for-my-machine'
>
> We’ve very much interested in that.  However, input labels don’t have a
> role here since ‘--with-input’ matches packages by name.
>
> So most likely, we’d (1) use OpenBLAS by default everywhere instead of
> netlib blas/lapack, and (2) you’d use:
>
>   --with-input=openblas=openblas-tuned

Yeah, it make sense. :-)

Cheers,
simon