On Oct 31, 2005, at 8:50 AM, Mike Houston wrote:
When only sending a few messages, we get reasonably good IB
performance,
~500MB/s (MVAPICH is 850MB/s).
What is your message size? Are you using the leave pinned option? If
not, specify -mca mpi_leave_pinned 1 option to mpirun. This tells
Open MPI to cache message buffers (this is what MVAPICH does),
otherwise we don't have a fair comparison.
However, if I crank the number of
messages up, we drop to 3MB/s(!!!). This is with the OSU NBCL
mpi_bandwidth test.
When you say crank the number of messages up, do you mean the number
of messages of the same size? If so, what message size?
Thanks,
Galen
We are running Mellanox IB Gold 1.8 with 3.3.3
firmware on PCI-X (Couger) boards. Everything works with MVAPICH, but
we really need the thread support in OpenMPI.
Ideas? I noticed there are a plethora of runtime options configurable
for mvapi. Do I need to tweak these to get performacne up?
Thanks!
-Mike
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