[Beowulf] torus versus (fat) tree topologies

[Underwood, Keith D]

Yep, that's the standard solution.  Red Storm has the Z dimension in the
cabinet (and, so, is a torus) and we choose not to connect X or Y in a
torus (for a couple of reasons), but it could hypothetically be done
using this type of scheme.   (i.e. you use the same type of
interleaving, but you do it at the cabinet/row level).

					Keith

> BlueGene's trick is to attach every other node to the end, and then
> come back with the unused ones. So:
> 
> Nodes: 0 1 2 3 4
> 
> Connections: 0 -> 2 -> 4 -> 3 -> 1 -> 0
> 
> No long cable. This is probably a classic solution not invented by IBM.
> 
> -- greg
> 
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