[Bug 1350257] Review Request: petsc - Portable Extensible Toolkit for Scientific Computation

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https://bugzilla.redhat.com/show_bug.cgi?id=1350257



--- Comment #15 from Dave Love <d.love@xxxxxxxxxxxxxxx> ---
(In reply to benson_muite from comment #11)
> OpenBLAS or ATLAS would be nice. 

ATLAS, at least as packaged, is a factor of several slower for dgemm on recent
x86.  (I don't know how much use petsc actually makes of BLAS, and with the
Fedora linear algebra mess it may be a lottery whether something else linked
against reference BLAS wins.)

> Am looking  at adding CLBLAS in future -
> will there be options to allow users to choose BLAS library being used?

There should be, and the default should be the most efficient for the
architecture.
You can find a workaround at
https://loveshack.fedorapeople.org/blas-subversion.html
which links to orion's proposal for sorting things out which I, or someone
else, need to run with now.

> Netlib blas is still useful for checking correct results 

It also has (had) bugs, of course; see the Fedora changelog for one that
was uncovered by R, I think.

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