[Beowulf] fast interconnects
eugen at leitl.org
Tue May 23 04:44:03 PDT 2006
On Tue, May 23, 2006 at 04:15:40AM -0700, Jim Lux wrote:
> 3) Then, there's the switch. If it's a *switch* that sets up circuits,
> then it can be fairly inexpensive. If it's something that has to do packet
> buffering, it gets a lot more expensive.
Switches (crossbars) don't scale for very many ports. Especially if you have to
do cut-through switching at those high speeds. It would be good if each NIC
would came with an integrated switch, with enough ports to wire at least a 3d
torus (where you route/switch messages via Bresenham).
In regards to keeping the wires short, does this IBM trick of keeping all
wires equal-length work well on 3d lattices, and above? This would seem to
be a must for those coming (hopefully) Hypertransport motherboards with
Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org
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