int smpi_mpi_cart_get(MPI_Comm comm, int maxdims, int* dims, int* periods, int* coords) {
MPI_Topology topo = smpi_comm_topo(comm);
int smpi_mpi_cart_get(MPI_Comm comm, int maxdims, int* dims, int* periods, int* coords) {
MPI_Topology topo = smpi_comm_topo(comm);