[Beowulf] How Would You Test Infiniband in New Cluster?
bill at cse.ucdavis.edu
Tue Nov 17 19:18:58 PST 2009
Jon Forrest wrote:
> I had said "I believe these are with IB."
> Now I'm not so sure. I just did a
The performance numbers you showed from relay and mpi_nxnlatbw are definitely
much faster than GigE. Unless it's multiple copies running on a single
machine (thus printing the hostname).
Assuming that it was actually using the interconnect (not multiple copies
running on a single machine)
> "ifconfig ib0"
I suspect this is for TCPIP over ib, and doesn't show MPI traffic. You didn't
mention which controllers do you have? I suspect that there is a tool to show
the various counters on the HCA, let alone on the switch side.
> I'll have to figure out how to force IB when
> using OpenMPI.
Looks like IB to me, might want to do the reverse to see the real
differential, I find it very handy for cost justifying IB on future clusters
based on real application performance.
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