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[OMPI users] crashing on MPI_SEND -- program exited with code 021, when ~1200 cores

Hello, I've been using openmpi (version 1.3.2) for some time, but recently have had greater than 1000 cores available. My code runs fine with 1000 cores but fails when attempting to use 1200 cores. The only information at the time of the crash is: . Within the debugger I know the crash is occ