Hello, On Wed, Aug 18, 2010 at 12:28 PM, Paolo Giannozzi <giannozz at democritos.it>wrote:
> > On Aug 18, 2010, at 19:03 , joaquin peralta wrote: > > > We use a surface of Al with 81 atoms in 128 cpus using intelMPI and > > openMPI 1.4 > > but not in the same way! the first job uses 8 pools of 16 processors, > the second > Yes it's true, not the same way. > 1 pool of 128 processors. The first choice seems to be reasonable, > the second > After i recheck my times again, and compare a more realistic run. > isn't, since an enormous amount of time is spent in communications > (look at the > time spent in fft_scatter). > > Is possible know previously how is the best parameter to use with -np, I mean if somebody recommend me a thread about the uses (i don't understand very well the manual yet) of the optimization flags (pool, image, ntg, diag). Thanks in advance Joaquin Peralta > P. > --- > Paolo Giannozzi, Dept of Physics, University of Udine > via delle Scienze 208, 33100 Udine, Italy > Phone +39-0432-558216, fax +39-0432-558222 > > > > _______________________________________________ > Pw_forum mailing list > Pw_forum at pwscf.org > http://www.democritos.it/mailman/listinfo/pw_forum > -- ---------------------------------------------------- Group of NanoMaterials ---------------------------------------------------- http://www.gnm.cl ---------------------------------------------------- Joaqu?n Andr?s Peralta Camposano ---------------------------------------------------- http://zeth.ciencias.uchile.cl/~jperalta In a world without frontiers, who needs Gates and Win. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.democritos.it/pipermail/pw_forum/attachments/20100819/742ae77c/attachment-0001.htm
