Re: SMP scalability: 8 -> 32 CPUs

Larry McVoy (
Tue, 01 Dec 1998 10:43:13 -0800

Jason Riedy <> says:

: There's another interesting paradigm out there. Consider clusters
: of SMPs... Many problems break up into smaller ones that fit current
: SMPs quite nicely. IBM's latest SP/2s are clump machines... The
: Linux kernel scaling to 4 cpus could fit this beautifully on the right
: systems.

I think this is worth repeating. When I was starting the clusters
effort at Sun, it got cast as a "cluster-or-SMP" fight which was most
unfortunate. You absolutely want to cluster SMPs - the SMP nodes provide
you with a level of dynamic load balancing which is virtually impossible
to get in a cluster of UP nodes.

Do not think of clusters as "clusters on UPs" only - the people who want the
highest performance will be clustering the most scalable SMP machines they
can find.

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