Hi, These are nehalem Xeons I presume? Then you get 15 to 20% more performance in Gromacs running 2 vs 1 thread or process per physical core.
Berk > Date: Fri, 6 Aug 2010 09:24:11 -0500 > From: dmob...@gmail.com > To: gmx-users@gromacs.org > Subject: [gmx-users] hyperthreading > > Dear All, > > I'm putting together a new Dell Xeon cluster running ROCKS 5.3 which > uses CENTOS (6 I believe). This is currently ~20 dual quad-cores with > roughly 16 GB of RAM each. > > In any case, I wanted to inquire about hyperthreading. Does anyone > have experience on similar machines with vs. without hyperthreading? > The ROCKS users list suggests that hyperthreading ought always be off > for HPC applications, which sounds overly simplistic to me, though I > more or less follow the logic of this. > > So, has anyone done any benchmarking yet in a similar setting, and > what thoughts do you have? I obviously can do some benchmarking myself > as well but I thought I'd check in with the list first. > > Thanks so much, > David > > > -- > David Mobley > dmob...@gmail.com > 504-383-3662 > -- > gmx-users mailing list gmx-users@gromacs.org > http://lists.gromacs.org/mailman/listinfo/gmx-users > Please search the archive at http://www.gromacs.org/search before posting! > Please don't post (un)subscribe requests to the list. Use the > www interface or send it to gmx-users-requ...@gromacs.org. > Can't post? Read http://www.gromacs.org/mailing_lists/users.php
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