[Beowulf] torus versus (fat) tree topologies

[Ashley Pittman]

On Tue, 2004-11-16 at 08:50 +0800, xiang wrote:
> Greg, 
> 
> Could you tell me the web address of low-latency fat examples ? 

A shameless plug but I believe we are the lowest latency fat tree
network.  I have seen as little as 1.38 MPI latency although it's very
dependant on node-type.

http://www.quadrics.com/

Here is the top500 page for one of the big systems:

http://www.top500.org/sublist/System.php?id=6762

Ashley,