Dear Filippo, I ran test job for vc-relax of NaCl crystal both on CPU only and GPU. I found that wall time of the CPU job is (29 minutes) which less than time given me by GPU job (49 minutes). I used the same command line for start as I wrote in previous email. Could you please explain for what size of the system or for what kind of jobs should I get an advantage with GPU rather than CPU?
Thank you! *--* *Sincerely yours,* *Alexander G. Kvashnin * *=====================================================PhD Student Moscow Institute of Physics and Technology http://mipt.ru/ <http://s.wisestamp.com/links?url=http%3A%2F%2Fmipt.ru%2F&sn=>* *141700, Institutsky lane 9, Dolgoprudny, Moscow Region, Russia* *Junior research scientistTechnological Institute for Superhard and Novel Carbon Materials http://www.tisnum.ru/ <http://s.wisestamp.com/links?url=http%3A%2F%2Fwww.tisnum.ru%2F&sn=> <http://s.wisestamp.com/links?url=http%3A%2F%2Fwww.ntcstm.troitsk.ru%2F&sn=>142190, Central'naya St. 7a, Troitsk, Moscow Region, Russia=====================================================* On 26 March 2014 19:13, Filippo Spiga <spiga.filippo at gmail.com> wrote: > > On Mar 26, 2014, at 12:33 AM, Alexander G. Kvashnin <agkvashnin at gmail.com> > wrote: > > mpirun -np 2 /qe-dir/bin/pw-gpu.x -in input > output > > > > And it will start with 2 MPI process and get 2 GPUs on my host. Is it > correct? > > Yes. But if 2 MPI processes are enough to run the calculation I suggest to > run the code in serial. The GPU acceleration will be probably faster. > > F > > -- > Mr. Filippo SPIGA, M.Sc. > http://www.linkedin.com/in/filippospiga ~ skype: filippo.spiga > > ?Nobody will drive us out of Cantor's paradise.? ~ David Hilbert > > ***** > Disclaimer: "Please note this message and any attachments are CONFIDENTIAL > and may be privileged or otherwise protected from disclosure. The contents > are not to be disclosed to anyone other than the addressee. Unauthorized > recipients are requested to preserve this confidentiality and to advise the > sender immediately of any error in transmission." > > > > _______________________________________________ > 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/20140328/e41e7d8e/attachment.html