Hi,
For Gromacs 4.0, which will come out in a few months, the situation will be
quite different. The parallelization has been much improved and automatic
sorting of atoms optimizes the memory access a lot.
Both these things have much more effect on the Core2 CPUs which don't
have hypertransport or a built in memory controller.
So both the scaling and the absolute will go up significantly for Core2
and only slightly for AMD CPUs.
Berk.
From: Carsten Kutzner <[EMAIL PROTECTED]>
Reply-To: Discussion list for GROMACS users <gmx-users@gromacs.org>
To: Discussion list for GROMACS users <gmx-users@gromacs.org>
Subject: Re: [gmx-users] Barcelona vs Xeon
Date: Wed, 28 Nov 2007 09:55:05 +0100
Hi Martin,
we have carried out benchmarks on a Barcelona 2.0 GHz versus a 2.3 GHz
Clovertown. Here are numbers for an 80000 atom system with PME
electrostatics and Gromacs 3.3.1.
On the Barcelona we get a performance of 0.38, 0.71, 1.27 and 2.40
ns/day for 1, 2, 4, and 8 CPUs, respectively. On the Clovertown we get
0.52, 0.97, 1.75, and 2.74 ns/day. So indeed the scaling on the AMDs is
much better on 8 CPUs (80% compared to 66%), but the absolute
performance is better on the Intels.
For a 2.0 GHz Clovertown the absolute performance on 8 CPUs is probably
nearly the same as on a Barcelona, but the single-CPU performance will
still be better on the Clovertown. One has to keep in mind, however,
that this is just a single benchmark and other MD systems might show a
different scaling behaviour.
Carsten
Martin Höfling wrote:
> Hi all,
>
> Barcelona 1.9GHz vs Xeon 2.0GHz
>
> has anyone here benchmarked these two available 8-core solutions?
Speed/core
> wins probably the intel side but what about scaling on 8 cores? Has the
> NUMA/Hypertransport architecture an advantage here?
>
> In price, they are very similar. Xeon is of course available with higher
> frequencies but also increases in cost/cpu very fast.
>
> Best
> Martin
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--
Dr. Carsten Kutzner
Max Planck Institute for Biophysical Chemistry
Theoretical and Computational Biophysics Department
Am Fassberg 11
37077 Goettingen, Germany
Tel. +49-551-2012313, Fax: +49-551-2012302
http://www.mpibpc.mpg.de/research/dep/grubmueller/
http://www.gwdg.de/~ckutzne
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