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 > > > _______________________________________________ > Pw_forum mailing list > Pw_forum at pwscf.org > http://pwscf.org/mailman/listinfo/pw_forum -------------- next part -------------- An HTML attachment was scrubbed... URL: http://pwscf.org/pipermail/pw_forum/attachments/20140712/149f0368/attachment.html
