P0 P1 0 0 1 1 P2 P3 2 2 3 3 \color{red}commA \color{red}color = red \color{green}commB \color{green}color = green intercomm P0 P1 1 0 0 1 P2 P0 2 3 5 4 \color{red}commA' \color{green}commB' MPI_Send(buf, dest=2, tag, intercomm) src = 1 src_label = local_rank_map->at(1).second = 1 dest_label = remote_rank_map->at(2).second = 1 src_rank = local_rank_map->at(1).first = 0 dest_rank = remote_rank_map->at(dest).first = 3 MPI_Send(buf, dest_rank=3, tag, commA') \color{red}intra-communication P0 P1 0 0 1 1 P2 P3 2 2 3 3 \color{red}commA \color{red}color = red \color{green}commB \color{green}color = green intercomm P0 1 0 0 1 2 3 5 4 \color{red}commA' \color{green}commB' MPI_Send(buf, dest=2, tag, intercomm) src = 0 src_label = local_rank_map->at(0).second = 0 dest_label = remote_rank_map->at(2).second = 1 src_rank = local_rank_map->at(0).first = 1 dest_rank = remote_rank_map->at(dest).first = 3 MPI_Send(buf, dest_rank=3, tag, intercomm) \color{red}inter-communication src_rank_local = rank_map->at(0).first = 0 dest_rank_local = rank_map->at(3).first = 1 src_rank_local = _intercomm_rank_map->at(1).first = 1 dest_rank_local = intercomm_rank_map->at(3).first = 1 P1 P2 P0 false true 50 1.0 cm false 10 0 true true true 2.0.8 1867 1176 53 24 0.9748259239421532 true true true 138