On Tue, Feb 24, 2015 at 2:09 PM, Harry Mark Greenblatt <harry.greenbl...@weizmann.ac.il> wrote: > BS"D > > Dear David, > > > Hey Harry, > > Thanks for the caveat. Carsten Kutzner posted these results a few days ago. > This is what he said : > > I never benchmarked 64-core AMD nodes with GPUs. With a 80 k atoms test > system using a 2 fs time step I get > 24 ns/d on 64 AMD cores 6272 > 16 ns/d on 32 AMD cores 6380 > 36 ns/d on 32 AMD cores 6380 with 1x GTX 980 > 40 ns/d on 32 AMD cores 6380 with 2x GTX 980 > 27 ns/d on 20 Intel cores 2680v2 > 52 ns/d on 20 Intel cores 2680v2 with 1x GTX 980 > 62 ns/d on 20 Intel cores 2680v2 with 2x GTX 980 > > > I think 20 Intel cores means 2 x 10 cores each. > > Yes, the 2680v2 is a 10 core processor. The "interference" I mentioned is > not apparent across sockets, only within. > > > > > But Szilard just mentioned in this same thread : > > If you can afford them get the 14/16 or 18 core v3 Haswells, those are > *really* fast, but a pair can cost as much as a decent car. > > > > Perhaps he has seen some real results that do not show issues at 16 or 18 > cores/socket, in which case they would be advantageous, if one can afford > them. I am only going on what the manager of our cluster mentioned to me in > his tests. But his tests were based on many different software packages, so > perhaps Gromacs is less/not affected.
OK, that's an entirely different claim than the one you made initially. I dare to say that it is dangerous to mix performance observations of many software packages - especially with that of GROMACS. However, again, if you have the data, please share it. -- Szilárd > Harry > > > > > > > ------------------------------------------------------------------------- > > Harry M. Greenblatt > > Associate Staff Scientist > > Dept of Structural Biology > > Weizmann Institute of Science Phone: 972-8-934-3625 > > 234 Herzl St. Facsimile: 972-8-934-4159 > > Rehovot, 76100 > > Israel > > > harry.greenbl...@weizmann.ac.il<mailto:harry.greenbl...@weizmann.ac.il> > > > > > > > > -- > Gromacs Users mailing list > > * Please search the archive at > http://www.gromacs.org/Support/Mailing_Lists/GMX-Users_List before posting! > > * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists > > * For (un)subscribe requests visit > https://maillist.sys.kth.se/mailman/listinfo/gromacs.org_gmx-users or send a > mail to gmx-users-requ...@gromacs.org. -- Gromacs Users mailing list * Please search the archive at http://www.gromacs.org/Support/Mailing_Lists/GMX-Users_List before posting! * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists * For (un)subscribe requests visit https://maillist.sys.kth.se/mailman/listinfo/gromacs.org_gmx-users or send a mail to gmx-users-requ...@gromacs.org.