Build Matrix Derived Datatype

void Build_matrix_type(LOCAL_MATRIX_T* local_A /* in */) {

MPI_Datatype temp_mpi_t;

int block_lengths[2];

MPI_Aint displacements[2];

MPI_Datatype typelist[2];

MPI_Aint start_address, address;

MPI_Type_contiguous(Order(local_A)*Order(local_A), MPI_FLOAT, &temp_mpi_t);

block_lengths[0] = block_lengths[1] = 1;

typelist[0] = MPI_INT;

typelist[1] = temp_mpi_t;

MPI_Address(local_A, &start_address);

MPI_Address(&(local_A->n_bar), &address);

displacements[0] = address - start_address;

MPI_Address(local_A->entries, &address);

displacements[1] = address - start_address;

MPI_Type_struct(2, block_lengths, displacements,

typelist, &local_matrix_mpi_t);

MPI_Type_commit(&local_matrix_mpi_t);

} /* Build_matrix_type */

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