[Beowulf] fast interconnects

[Joel Jaeggli]

Eugen Leitl wrote:
> 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 
> connectors.

I've seen htx connectors on 4-way machines, they appear to be arriving
on 2 ways machines as well.

http://www.supermicro.com/Aplus/motherboard/Opteron/nForce/H8DCE-HTe.cfm

http://www.supermicro.com/Aplus/motherboard/Opteron/HT1000/H8DSL-HTi.cfm
> 
> 
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Joel Jaeggli (joelja at uoregon.edu)
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