MPI Subroutines (organized by function) Initialization and Termination mpi_init mpi_finalize Parameters mpi_comm_size mpi_comm_rank Communicators and Groups mpi_comm_group mpi_group_incl mpi_group_excl mpi_comm_create Point-to-Point Communications mpi_send mpi_recv mpi_bsend mpi_attach mpi_isend mpi_irecv mpi_test mpi_wait Data types mpi_type_commit mpi_type_contiguous mpi_type_vector mpi_type_hvector mpi_type_indexed Collective Communications mpi_barrier mpi_bcast mpi_gather mpi_gatherv mpi_reduce mpi_allreduce Topologies mpi_cart_create mpi_cart_rank mpi_cart_get mpi_cart_coords