large clusters and topologies
sp at scali.no
Fri Jul 28 08:51:42 PDT 2000
Greg Lindahl wrote:
> > - I suppose Ethernet is not all too efficient with this
> > size, even with switches instead of hubs. What's the largest
> > practical size for an Ethernet 'wulf?
> Depending on the details, Ethernet can work great for larger machines. The
> 1,000 cpu genetic algorithm machine (www.genetic-programming.com) uses
> ethernet, Google's 5,000 cpu cluster uses ethernet, Incyte's 3,000 cpu
> cluster uses ethernet, and so forth. The key is that their application's
> network bandwidth and latency demands aren't maxing out what they have.
> > Any alternatives to Myrinet upwards of that?
> Not really. It depends.
SCI is a great alterative if you need high network bandwidth.
It is also highly scalable.
See http://www.scali.com for more information
> > - Which type of algorithm can take direct advantage of a cube,
> > toroid, ... topology? I would think even a "dumb" job like
> > matrix multiplication might benefit from a 2D lattice (instead
> > of the typical all-to-all unique segment). Comments?
> There are lots of books which discuss this topic. There have been many
> religious wars fought over the subject.
Steffen Persvold Systems Engineer
Email : mailto:sp at scali.no Scali AS (http://www.scali.com)
Tlf : (+47) 22 62 89 50 Olaf Helsets vei 6
Fax : (+47) 22 62 89 51 N-0621 Oslo, Norway
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