[Beowulf] Re: Opteron 275 performance

Mikhail Kuzminsky kus at free.net
Thu Jul 14 08:46:48 EDT 2005


In message from "S.I.Gorelsky" <gorelsky at stanford.edu> (Wed, 13 Jul 
2005 12:21:32 -0700 (PDT)):
>
>
>>The original post by S.Gorelsky (re-sent by E.Leitl) was about good
>>scalability of 4cores/dual-CPUs Opteron 275 server on Gaussian 03
>>DFT/test397 test. I'm testing just now like Supermicro server
>>w/2*Opteron 275 but w/DDR333 instead of DDR400 used by S.Gorelsky.
>>I used SuSE 9.0 w/2.4.21 kernel.
>
>>I understood, that original results of S.Gorelsky were obtained,
>>probably, for shared memory parallelization!
>
>This is correct. I did not use Linda parallelization. The reason
>for that is Linda's "far-from-best" scalability with Gaussian 03.

It depends. DFT, for example, (and not only DFT) has good scalability 
under Linda also (about 1.8-1.9 at every twice increasing of CPU 
numbers).

And I don't remember, what else than HF and DFT is parallelized in
G03 for shared memory ?

Yours
Mikhail 


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