Communication Protocols
It is important to specify the communication protocol used by a parallel program.
This affects the software and hardware used for communication and has ramifications
for performance. The means by which this is accomplished for MPI is through
the variable MPI_COMM. This must be set prior to calling
vsched -m. The settings are case sensitive.
set MPI_COMM=TCP
TCP runs over ethernet and is available on all clusters. It is currently the only
communication protocol available on this system.
