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

[Kazem Jahanbakhsh]

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.

regards,
Jahanbakhsh
  

Christian Burisch <burisch at bph.rub.de> wrote:  Kazem Jahanbakhsh wrote:
> Hi everybody,

Hi Kazem,

> Dual Core platform. From your benchmark table we saw that for
> single Opteron processor we have a performance about 393
> picoseconds of simulation time per day (by Intel 8 compiler) and
> for single Opteron-DC we have  performance about 450 instead of
> ideal expected performance about 2*393 (by gcc 3.4.3 compiler) .

"N" means number of cores, not processors.

> According with these results and by considering cost per
> performance ratio it seems that Single-Core architecture is better
> than advanced Dual-Core architecture. 

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.

Regards

Christian


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