mpi.get.sourcetag finds the source and tag of a received message.
mpi.get.sourcetag(status = 0)
a status number
mpi.probe, one can use
to find who sends the message or with what a tag number.
mpi.get.sourcetag must be called immediately after calling
mpi.probe otherwise the obtained information may not
2 dim int vector. The first integer is the source and the second is the tag.
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