Get_rank           26 examples/hello_cxx.cc     rank = MPI::COMM_WORLD.Get_rank();
Get_rank           27 examples/ring_cxx.cc     rank = MPI::COMM_WORLD.Get_rank();
Get_rank          258 ompi/mpi/cxx/comm.h   virtual int Get_rank() const;
Get_rank           90 ompi/mpi/cxx/group.h   virtual int Get_rank() const;