[Beowulf] Strange Opteron 2350 performance: Gaussian-03

Mikhail Kuzminsky kus at free.net
Sat Jun 28 13:39:08 EDT 2008


In message from Bernd Schubert <bernd-schubert at gmx.de> (Sat, 28 Jun 
2008 19:04:50 +0200):
>On Saturday 28 June 2008, Li, Bo wrote:
>> Hello,
>> Sorry, I don't have the same applications as you.
>> Did you compile them with gcc? If gcc, then -o3 can do some 
>>optimization.
>> -march=k8 is enough I think.
>
>As Mikhail wrote in his first mail, he uses binaries from Gaussian 
>Inc. Can gfortran in the mean time compile gaussian? Even if it can, 
>it might be a problem for publications, since the only officially 
>supported compiler is pgf77.
>Mikhail, do you have the source at all? Due to the different cache 
>model of the barcelona a recompilation might really help.

Yes, of course recompilation gives better results :-)
I'm not sure about gfortran "reality" for Gaussian codes;
- we don't have Gaussian-03 source codes :-(

And the question is - may be that OLD binary (w/o recompilation) will 
run so slow on Opteron 2350 core ?

Yours
Mikhail
>
>> And you make sure the CPU running at the default frequency. Sometime
>
>Yeah, can you check the scaling governor isn't set to ondemand or 
>conservative?
>
>
>Cheers,
>Bernd

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