[Beowulf] torus versus (fat) tree topologies
lindahl at pathscale.com
Fri Nov 12 19:55:48 EST 2004
On Fri, Nov 12, 2004 at 06:02:08PM -0500, Patrick Geoffray wrote:
> How do you close your Torus without long cables ? Unless you stack your
> nodes in a circle, you will need long cables.
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.
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