hdf5/HDF5Examples/C/H5PAR/ph5_file_create.c

/*
 *  This example creates an HDF5 file.
 */

#include "hdf5.h"

#define H5FILE_NAME "SDS_row.h5"

int
main(int argc, char **argv)
{
    /*
     * HDF5 APIs definitions
     */
    hid_t  file_id;  /* file and dataset identifiers */
    hid_t  plist_id; /* property list identifier( access template) */
    herr_t status;

    /*
     * MPI variables
     */
    int      mpi_size, mpi_rank;
    MPI_Comm comm = MPI_COMM_WORLD;
    MPI_Info info = MPI_INFO_NULL;

    /*
     * Initialize MPI
     */
    MPI_Init(&argc, &argv);
    MPI_Comm_size(comm, &mpi_size);
    MPI_Comm_rank(comm, &mpi_rank);

    /*
     * Set up file access property list with parallel I/O access
     */
    plist_id = H5Pcreate(H5P_FILE_ACCESS);
    H5Pset_fapl_mpio(plist_id, comm, info);

    /*
     * OPTIONAL: It is generally recommended to set collective
     *           metadata reads on FAPL to perform metadata reads
     *           collectively, which usually allows datasets
     *           to perform better at scale, although it is not
     *           strictly necessary.
     */
    H5Pset_all_coll_metadata_ops(plist_id, true);

    /*
     * OPTIONAL: It is generally recommended to set collective
     *           metadata writes on FAPL to perform metadata writes
     *           collectively, which usually allows datasets
     *           to perform better at scale, although it is not
     *           strictly necessary.
     */
    H5Pset_coll_metadata_write(plist_id, true);

    /*
     * Create a new file collectively.
     */
    file_id = H5Fcreate(H5FILE_NAME, H5F_ACC_TRUNC, H5P_DEFAULT, plist_id);

    /*
     * Close property list.
     */
    H5Pclose(plist_id);

    /*
     * Close the file.
     */
    H5Fclose(file_id);

    if (mpi_rank == 0)
        printf("PHDF5 example finished with no errors\n");

    MPI_Finalize();

    return 0;
}