My test wasn't a benchmark - I was just testing with a little program
that calls mpi_init, mpi_barrier, and mpi_finalize.
A test with just mpi_init/finalize works fine, so it looks like we
simply hang when trying to communicate. This also only happens on
multi-node operations.
On Jul 28, 2008, at 10:16 AM, Jeff Squyres wrote:
On Jul 28, 2008, at 12:03 PM, George Bosilca wrote:
Interesting. The self is only used for local communications. I
don't expect that any benchmark execute such communications, but
apparently I was wrong. Please let me know the failing test, I will
take a look this evening.
FWIW, my manual tests of a simplistic "ring" program work for all
combinations (openib, openib+self, openib+self+sm). Shrug.
But for OSU latency, I found that openib, openib+sm work, but openib
+sm+self hangs (same results whether the 2 procs are on the same
node or different nodes). There is no self communication in
osu_latency, so something else must be going on.
--
Jeff Squyres
Cisco Systems
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