energy costs

Josip Loncaric josip at nianet.org
Wed Mar 12 12:14:50 EST 2003


>>PS Pentium 4 sustained performance from memory is about
>>   5% of peak (stream triad).
> 
> that should be 50%, I think.

Our CFD codes are mostly memory bandwidth limited, so they deliver real life 
Mflop/s performance of about (Pentium CPU MHz)/10, i.e. about 5% of peak. 
Crays tend to be about 5 times more efficient, but this is highly dependent on 
how well code vectorizes.

Sincerely,
Josip

-- 
Dr. Josip Loncaric, Research Fellow              mailto:josip at nianet.org
National Institute of Aerospace       http://research.nianet.org/~josip/
144 Research Drive                       mailto:j.loncaric at larc.nasa.gov
Hampton, VA 23666, USA         Tel. +1-757-766-1395  Fax +1-757-766-1401

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