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.
Is it something to do with the MPI_Barrier call? osu_latency uses
MPI_Barrier and from rhc's email it sounds like his code does too.
--td
