[Beowulf] How to configure a cluster network
hahn at mcmaster.ca
Thu Jul 24 18:39:00 EDT 2008
> If you need 144 ports a single switch will be be more cost effective
you'd think so - larger switches let you factor out lots of separate
little power supplies, etc. not to mention transforming lots of cables
into compact, reliable, cheap backplanes. but I haven't seen chassis
switches actually wind up cheaper.
of course, IB hardware prices seem to be extremely fuzzy (heavily
discounted from list).
> than a gaggle of 24 ports gathered together into a tangled hairy cable ball with
> 144 ports exposed.
once very nice thing about the leaf/trunk fat-tree approach is that your
switches can be distributed in node racks. so any individual rack has
a fairly managable bundle of cables coming out of it.
> Your point about "most people don't need" is important! With large
> multi core, multiple socket systems external and internal bandwidth
> can be interesting to ponder.
that makes it sound like inter-node networks in general are doomed ;)
while cores-per-node is increasing, users love to increase cores-per-job.
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