2.2
MPI applications may start new processes through an interface to an external process manager.
MPI_COMM_SPAWN
starts MPI processes and establishes communication with them,
returning an intercommunicator.
MPI_COMM_SPAWN_MULTIPLE
starts several different binaries (or the same binary with
different arguments), placing them in the same
MPI_COMM_WORLD and returning an intercommunicator.
MPI uses the existing group abstraction to represent processes.
A process is identified by a (group, rank) pair.
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(Unofficial) MPI-2.2 of September 4, 2009
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