[Beowulf] torus versus (fat) tree topologies

[Ashley Pittman]

On Fri, 2004-11-12 at 17:51 -0500, Patrick Geoffray wrote:
> 
> Going trough a crossbar cost about 100-150ns these days.

This isn't necessarily true, we reckon about 25ns on elan4.  This
doesn't give you perfect latency scaling across very large networks but
it's very close.

Ashley,

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