On Mar 21, 2007, at 5:21 PM, Greg Lindahl wrote:
On Wed, Mar 21, 2007 at 06:41:07AM -0400, Scott Atchley wrote:
I have not benchmarked any applications that need more than 250 MB/s
during computation,
There is a large class of computations which alternate non-overlapped
compute and communicate cycles. The average over the lifetime of the
process can be ~ 100 MB/s, but that could easily mean it is sending
at 1 GByte/s for 10% of the runtime. If you slow down communications
by a factor of 4, the app will run a lot slower.
-- greg
I agree that that is a possibility. In the CFD codes that I have
tested, I have never seen more than 3% difference between
Myrinet-2000 and Myri-10G, so I assume that the bandwidth is not
critical in _these_ applications. :-)
Scott
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