mpi.comm.disconnect disconnects itself from a communicator and then
deallocates the communicator so it points to MPI\_COMM\_NULL.
a communicator number
When members associated with a communicator finish jobs or exit, they have to
mpi.comm.disconnect to release resource if the communicator was
created from an intercommunicator by
mpi.comm.free is used instead,
by slaves may cause undefined impacts on master who wishes to stay.
1 if success. Otherwise 0.
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