[Beowulf] torus versus (fat) tree topologies
james.p.lux at jpl.nasa.gov
Fri Nov 12 23:35:07 EST 2004
----- Original Message -----
From: "Greg Lindahl" <lindahl at pathscale.com>
To: <beowulf at beowulf.org>
Sent: Friday, November 12, 2004 4:55 PM
Subject: Re: [Beowulf] torus versus (fat) tree topologies
> 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.
Used, for instance, in series wired Christmas tree light strings..
One never knows though... it could have been patented by IBM.
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