DUAL CPU board vs 2 Single CPU boards: bang for buck?
josip at icase.edu
Thu Mar 7 11:21:50 PST 2002
"Robert G. Brown" wrote:
> Your Mileage May Vary
Exactly. The cost of duals is about 15% lower per CPU, but some codes
(e.g. CFD) perform about 25% worse on duals due to memory contention.
If you do CFD, price/performance can favor singles by about 10%; if you
do something less memory intensive, duals win by about 15%. Other
factors (such as space efficiency, power/AC requirements,
simplicity/reliability, personal preferences) are often more significant
than these 10-15% differences in node price/performance.
One exception: If you use a high end network (e.g. Myrinet, which can
almost double the cost of a node) this clearly favors duals which need
only half as many expensive network connections.
Dr. Josip Loncaric, Research Fellow mailto:josip at icase.edu
ICASE, Mail Stop 132C PGP key at http://www.icase.edu./~josip/
NASA Langley Research Center mailto:j.loncaric at larc.nasa.gov
Hampton, VA 23681-2199, USA Tel. +1 757 864-2192 Fax +1 757 864-6134
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