[petsc-users] MPI speedup

[Matthew Knepley]

On Thu, Apr 23, 2015 at 3:11 PM, Jed Brown <jed at jedbrown.org> wrote:

> Matthew Knepley <knepley at gmail.com> writes:
> >Your processor has
> > 6 cores, each running at 3.4 GHz, and it can do 4flops/cycle using the
> > vector instructions,
>
> Actually, it has AVX, so it can do 8 flops/cycle (1 packed multiply and
> 1 packed add, each with 4-wide vector registers).
>

I don't like counting FMA since its a special, not a generic, floating
point instruction, but
I guess everyone does it.

  Matt


> >so they
> > report that it can do 81 GF/s, but you cannot get values to it fast
> enough
> > to compute.
>
>


-- 
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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