energy costs

Josip Loncaric josip at
Wed Mar 12 09:14:50 PST 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.


Dr. Josip Loncaric, Research Fellow              mailto:josip at
National Institute of Aerospace
144 Research Drive                       mailto:j.loncaric at
Hampton, VA 23666, USA         Tel. +1-757-766-1395  Fax +1-757-766-1401

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