josip at nianet.org
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 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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