[Beowulf] Advice on 4 CPU node configurations

[Eugen Leitl]

On Tue, Feb 08, 2011 at 07:06:14PM -0500, Gus Correa wrote:

> how much cabling does it take to wire a 2D or 3D doughnut/torus
> on the back of racks of servers with these Numascale cards,

A cubic carbon (diamond) lattice would use 4 links
for a 3d lattice, but for cubic primitive you'd go
4 links for 2d and 6 links for 3d. 

Cables can be short within a rack if your grid is
wrapped around. Of course if you start to interconnect
nodes in adjacent racks with short cables for 3d, the
result would drive a spider green with envy. So
below the floor they would go, and pretty thick cable
bundles they're going to be, even if they're plain CAT 5e.

> and no switch.
> (Or do they use switches?)
> How much cabling?
> Does it scale well?
> Or will it look like our router on the 3rd floor?
> Anyway, it's not as fun as Homer.

-- 
Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org
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