[Pw_forum] QE on Xeon Phi

[Axel Kohlmeyer]

Stick with the cpu. For QE you should be best off with intel. Also you are
likely to get the best price/performance ratio with CPUs that have less
than the maximum number of cpu cores and a higher clock instead.

Axel.
On Jul 11, 2014 7:45 PM, "Eduardo Menendez" <eariel99 at gmail.com> wrote:
>
> Dear fellows,
>
> I need to know if it is worth to buy Xeon coprocessors for use with
Quantum ESPRESSO. I need make a choice between more CPU or less
CPU+coprocessor, and even to choose between few Intel cores vs not-so-few
AMD Opterons. Searching in the Web I have found these implemntatios of QE
on Xeon Phi:
> (1) a Quantum ESPRESSO modified for Xeon Phi, by Fabio Affinito,  and
> (2) an instructions for instalation of standard Quantum ESPRESSO with
some automagic use of Xeon Phi by the MKL. Here is the site
>
https://software.intel.com/en-us/articles/quantum-espresso-for-intel-xeon-phi-coprocessor
>
> Is the choice (1) available and  mature enough for a general use, or at
least for
> using PWscf for calculations of defects in supercells containg a multiple
of 64 atoms?
> Is choice (2) effcient? I see a benchmark in that site that, if I
interpret correctly, it indicates only a 12% improvement. Hence I think
this automagic choice is not worth enough. Am I wrong?
>
> Choice 2 needs installing MPSS (Manycore Platform Software Stacks) and
Intel MPI. Does choice (1) also require these components?
>
> MPSS is supported for Red Hat and SUSE. Is there any good experience with
Debian or Ubuntu?
>
> At this point I feel rather conservative :-( . If not warmed by
enthusiastic praise of coprocessors, or GPU, I will keep looking for as
many CPU cores as possible.
>
>
> Cheers,
>
>
> Eduardo Menendez Proupin
> Departamento de Fisica, Facultad de Ciencias, Universidad de Chile
> URL: http://www.gnm.cl/emenendez
>
> “Science may be described as the art of systematic oversimplification.”
Karl Popper
>
>
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