[QE-users] QE6.8: "Slab decomposition and task groups not implemented"

[Paolo Giannozzi]

On Wed, Aug 18, 2021 at 1:01 PM Sebastian Hütter <sebastian.huetter at ovgu.de>
wrote:

Do you have an idea where that "large number" is? I've done a few test runs
> and slab is consistently 10..20% faster, so I guess I'm below that
>

when the number of MPI processes for FFT parallelization exceeds the third
FFT dimension (nr3s), the  efficiency of the slab parallelization flattens
out (for an obvious reason: there aren't enough slabs)

Paolo

>
> > The choice will be made automatic sooner or later.
>
> Automatically optimized defaults are always nice :)
>
>
> Best,
>
> Sebastian
>
> >
> > Paolo
> >
> >
> >
> >     Thanks for any help,
> >
> >     Sebastian
> >
> >     --
> >     M.Sc. Sebastian Hütter
> >     Otto-von-Guericke University Magdeburg
> >     Institute of Materials and Joining Technology
> >     Universitätsplatz 2
> >     D-39106 Magdeburg
> >     Tel.: +49 (0)391-67-54566
> >     Fax: +49 (0)391-67-44569
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> >
> >
> > --
> > Paolo Giannozzi, Dip. Scienze Matematiche Informatiche e Fisiche,
> > Univ. Udine, via delle Scienze 206, 33100 Udine, Italy
> > Phone +39-0432-558216, fax +39-0432-558222
> >
> >
> >
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-- 
Paolo Giannozzi, Dip. Scienze Matematiche Informatiche e Fisiche,
Univ. Udine, via delle Scienze 206, 33100 Udine, Italy
Phone +39-0432-558216, fax +39-0432-558222
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