[gmx-developers] GROMACS performance on Opteron Dual Core processors!

Kazem Jahanbakhsh k_jahanbakhsh at yahoo.com
Sun Oct 1 11:25:57 CEST 2006

----- Original Message ----
From: Christian Burisch <burisch at bph.rub.de>
To: Discussion list for GROMACS development <gmx-developers at gromacs.org>
Sent: Monday, September 25, 2006 5:45:41 PM
Subject: Re: [gmx-developers] GROMACS performance on Opteron Dual Core processors!

Christian wrote:

Hi Kazem,

>"N" means number of cores, not processors.

>No. Dual core architecture is superior, and as David already pointed 
>out (and as was already posted on this list) the latest Intel Core 2 
>Duo Xeon 5100 "Woodcrest" seems to beat the Opterons slightly.

I have confused with your description. I have some simple questions now, first is what does "Opteron-DC" stand for? Doesn't it mean "Dual-Core Opteron"?
You stated that "N" column in the benchmark table means number of cores and not the processors. I don't realize this at all. In the presented benchmark table for single processors they brought the results of "Opteron" processors with N=2 and N=4, if we consider the "N" value as the number of cores on one hardware chip, this does not match with the the Opteron processors that exist in single core architecture in the real world. I can't understand this contradiction in any way. Also in that table they showed the performance outputs of "Opteron-DC" processors with N=2 and N=4. This results doesn't mean if we consider the "N" as the number of cores per chip because in the market the "Dual-Core Opteron" processors only exist in dual core structure and AMD doesn't bring the Quad-Core processors into the market. for this reason I cant interpret the "N" number as the number of cores on single processor. Please clarify me in this misunderstanding.


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