[Fwd: Re: 32-port gigabit switch]
hahn at physics.mcmaster.ca
Thu Mar 6 18:10:47 EST 2003
> > >clusters. Remember on clusters latency is more important than
> > >throughput.
> > Bzzt. Wrong. Dead Wrong. "It depends" is the correct answer. (Don't
> > pass GO, don't collect $200).
it does depend.
but as generalizations go, bandwidth is easy; latency is hard.
> The grid stuff, like Mark Hahn described, only works on small clusters
> and increases the hardware requirements by a huge factor (2-3 cards per
> system and multiple switches).
it's very beowulfish to take advantage of changing hardware.
many/most server boards these days have two builtin gigabit links.
and why not take advantage of the new crop of small/cheap gige switches?
pricewatch has 8-ports for $US 320!
> Plus the additional admin time to
> configure and maintain all the networking options.
wiring requires some patience and care; I don't really see why admin
would be hard. in fact, I think for the grid-of-switches approach, the
builtin spanning tree would work fine, since there are no redundant links,
unlike with a fat tree. you'd still have to set routes on each node,
but wouldn't that just take a pretty simple perl script?
> Its a nightmare. Go with cheap, used Myrinet and save yourself a lot of
I don't see myrinet (or quadrics or IB) at <$100/port any time soon.
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