[Beowulf] scalability of cluster paper
Robert G. Brown
rgb at phy.duke.edu
Fri Feb 18 08:14:39 EST 2005
On Thu, 17 Feb 2005, Paul Johnson wrote:
> I am wondering if anyone could point me to a paper on the scalability
> issues of NOWs clusters or
> Beowulf clusters using MPI. Im curious what kind of scalability people
> see for clusters less than 10 nodes.
> Any reference to a paper would be greatly appreciated. I've been doing
> alot of scholar.googling but
> havent found what Im looking for yet.
There is a whole chapter on Amdahl's Law and scaling in my online
beowulf book (and several online talks and white papers ditto). Look on
under the Beowulf link.
Scalability isn't a question of number of nodes per se, it is a question
of the parallel speedup you observe as a FUNCTION of the number of nodes
participating in the problem, the problem "size" (really all other
parameters, not just size), the network characteristics, and the system
CPU/memory/bus characteristics. The presentation I give is a simplified
one that lets you see the general idea, but the reality is much more
complex for some classes of problem.
Robert G. Brown http://www.phy.duke.edu/~rgb/
Duke University Dept. of Physics, Box 90305
Durham, N.C. 27708-0305
Phone: 1-919-660-2567 Fax: 919-660-2525 email:rgb at phy.duke.edu
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