[gmx-users] hyperthreading

[Berk Hess]

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: dmobley at gmail.com
> To: gmx-users at 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
> dmobley at gmail.com
> 504-383-3662
> -- 
> gmx-users mailing list    gmx-users at 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-request at gromacs.org.
> Can't post? Read http://www.gromacs.org/mailing_lists/users.php
 		 	   		  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://maillist.sys.kth.se/pipermail/gromacs.org_gmx-users/attachments/20100809/2afd72a7/attachment.html>