[Beowulf] Network considerations for new generation cheap beowulfcluster
James.P.Lux at jpl.nasa.gov
Wed May 23 15:59:48 PDT 2007
At 02:20 PM 5/23/2007, Larry Stewart wrote:
>Peter St. John wrote:
>>Mostly I was thinking of TMC (famous for the animation in Jurassic
>>Park), 1982-1994, from MIT, mostly acquired by Sun; so something
>>from CalTech maybe predating that, or competing with it, would be
>>very interesting. I'll look, thanks.
>>My only artifacts are DOS 3.2 and SVr4 manuals :-)
>The problem with hypercubes is that the number of NICs per node
>grows with the machine size. Want to double your machine size?
>Then add a NIC to every node you already have. The number of nics,
>or links, or cables, grows O(NlogN) for N nodes. You get a machine
>diameter which is log N, which is nice, but there are ways to do
>that with a fixed number of NICs per node such as fat trees or the
Which is why Intel went to the "8 port switch in each node" sort of
architecture with the iPSC/2. The iPSC/1 got icky with having to
keep adding ethernet cards into each node. The iPSC/2 went to a
packaging with each node on a single card, with two flavors of nodes,
depending on whether it had a numeric/vector coprocessor or not. You
could put 128 nodes in a single rack, as I recall.
(iPSC => intel Personal Super Computer)
>TMC had, among other luminaries, Richard Feynman to help work out
>the routing software.
James Lux, P.E.
Spacecraft Radio Frequency Subsystems Group
Flight Communications Systems Section
Jet Propulsion Laboratory, Mail Stop 161-213
4800 Oak Grove Drive
Pasadena CA 91109
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