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

Matthew Knepley knepley at gmail.com
Wed Aug 20 16:41:02 CDT 2014

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


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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