Has anyone seen an issue where OpenMPI/Infiniband hangs when sending messages over 2^26 in size?
For a reason i have not determined just yet machines on my cluster (OpenMPI v1.5 and Qlogic Stack/QDR IB Adapters) is failing to send array's over 2^26 in size via the AllToAll collective. (user code) Further testing seems to indicate that an MPI message over 2^26 fails (tested with IMB-MPI) Running the same test on a different older IB connected cluster seems to work, which would seem to indicate a problem with the infiniband drivers of some sort rather then openmpi (but i'm not sure). Any thoughts, directions, or tests?
