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

[David van der Spoel]

Kazem Jahanbakhsh wrote:
> 
> 
> */David van der Spoel <spoel at xray.bmc.uu.se>/* wrote:
> 
>     Kazem Jahanbakhsh wrote:
>      > Dear Christian,
>      >
>      > 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 with this
>      > misunderstanding.
>     *//* 
>     */David van der Spoel /wrote:
>     *> Sorry for the confusion. N is the number of cores, so N is 1 for
>     an old
>      >opteron, if N is 4 it means 2 dual-core chips. One new core is
>     faster than >one old opteron.
>     Thanks for your attention. I didn't find out what does
>     *"Opteron-DC"* stand for? Please tell me what is the differences
>     between the "*Opteron*" processor types with N=2 or N=4 and
>     "*Opteron-DC*" processor types with similar number of cores (N=2
>     or 4) which you have brought in your single processor benchmarks.
>     Can you tell me some examples from the real AMD chipset models that
>     exists in the market today?
>      
>     regards,
>     Jahanbakhsh
>     ________________________________________________________________________
> 
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I've updated the caption to the table on the website.

-- 
David.
________________________________________________________________________
David van der Spoel, PhD, Assoc. Prof., Molecular Biophysics group,
Dept. of Cell and Molecular Biology, Uppsala University.
Husargatan 3, Box 596,  	75124 Uppsala, Sweden
phone:	46 18 471 4205		fax: 46 18 511 755
spoel at xray.bmc.uu.se	spoel at gromacs.org   http://folding.bmc.uu.se
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