[petsc-dev] P3DFFT is an open-source numerical library providing highly scalable implementation of 3D spectral transforms

[Matthew Knepley]

On Wed, Aug 20, 2014 at 4:31 PM, Jed Brown <jed at jedbrown.org> wrote:

> Barry Smith <bsmith at mcs.anl.gov> writes:
> >    My statement is based on experience, not models. I stand by it and
> >    yes it can be factors of that magnitude.  Now one could argue 3
> >    times faster so what, but if you are doing this solve millions of
> >    times and it is the most time consuming part of the simulation (by
> >    far) then it adds up.
>
> Here is one comparison:
>
> http://dx.doi.org/10.1103/PhysRevE.88.063308
>

Can you understand the scaling plots in that thing? And they make no attempt
at modeling. These kind of paper may help a small segment of people running
that exact problem on a similar architecture, but they really do not help
sort this
out.

   Matt

-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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