tips and tricks

Symmetric Mode MPI Performance without InfiniBand*

Symptom

Slow host-coprocessor MPI communications in systems with no InfiniBand* HCA.  If running with I_MPI_DEBUG=2 or higher, you will see one of the following messages indicating that the TCP fabric has been selected:

[0] MPI startup(): tcp data transfer mode
[0] MPI startup(): shm and tcp data transfer modes
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