> > Several persons replied and not a SINGLE ONE of them talks about > one way pingpong latency, which is one of the most important features > of a highend network for *many* applications.
Sigh, as I mentioned in my past post, go to the link below Understand that it requires reading skills. http://www.clustermonkey.net//content/view/121/33/1/1/ Look at Table One and the two graphs, there are numbers there. Read the numbers. They are MPI single byte latency for NetPipe. GigE is not perfect. My point is that for many applications it can work well. There are many other applications that need better networking. It is a price to performance argument. BTW, the NICs I used in the link above were $35 Intel MT/1000 desktop (32 bit PCI) cards. I managed to get 14.6 HPL GFLOPS and 4.35 GROMACS GFLOPS out of 8 nodes consisting of hardware with a total costs of $2500. (much less using today prices) Background is at the following link: http://www.clustermonkey.net//content/view/41/33/ As a point of reference, a quad opteron 270 (2GHz) reported 4.31 GROMACS GFLOPS. -- Doug _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
