message to the process target).
And in the process "target" which receive that message, we have
_recv_MPI_Tag[source] (it contains the last "tag" used for the Recv
of messages from the process source).
message to the process target).
And in the process "target" which receive that message, we have
_recv_MPI_Tag[source] (it contains the last "tag" used for the Recv
of messages from the process source).