[petsc-users] using intel mkl for optimized blas/lapack on amd nodes

[Stefano Zampini]

Given that the fix uses LD_PRELOAD, I don't think it should be our
responsibility

Il giorno gio 4 giu 2026 alle ore 17:20 Satish Balay <balay.anl at fastmail.org>
ha scritto:

> Hm PETSc primarily uses level1 blas - where the performance differences
> are likely not huge.
>
> So these workarounds might not be worth the effort [vs using AMD blas]?
>
>
> https://urldefense.us/v3/__https://www.amd.com/en/developer/aocl/blis.html__;!!G_uCfscf7eWS!ZlLZSYSJ2CPe8ib18GTsikw1SdMg_bSjP6PwhGwHErFBZzYvLwjVBzGFSpktQDr6AQfkO6GKO6YG8Blb0CUxflllj2s$
>
> Satish
>
> On Thu, 4 Jun 2026, Klaij, Christiaan via petsc-users wrote:
>
> > I came across this issue:
> >
> >
> https://urldefense.us/v3/__https://danieldk.eu/software/misc/intel-mkl-on-amd-zen__;!!G_uCfscf7eWS!fsSSG7b4cHz_fsk3H-3DI4kIopw4fIp1MW93aPTq10vZnZKOx1t7cEg2g4MbGyxZXr15OMM0jg0UU0q2p5ktYkQ$
> >
> > We do configure petsc with the intel mkl for optimized
> > blas/lapack using --with-blas-lapack-dir=${MKL_DIR}.
> >
> > How much would this issue affect the performance of petsc on amd
> > nodes? Do you have the proposed workaround in place?
> >
> > Chris
> > dr. ir. Christiaan Klaij | senior researcher
> > Research & Development | CFD Development
> > T +31 317 49 33 44 |
> https://urldefense.us/v3/__http://www.marin.nl__;!!G_uCfscf7eWS!fsSSG7b4cHz_fsk3H-3DI4kIopw4fIp1MW93aPTq10vZnZKOx1t7cEg2g4MbGyxZXr15OMM0jg0UU0q2h3yojEE$
> >
>
>

-- 
Stefano
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