Passing Hints to the Implementation

MPI_Info_create(&info);

/* no. of I/O devices to be used for file striping */

MPI_Info_set(info, "striping_factor", "4");

/* the striping unit in bytes */

MPI_Info_set(info, "striping_unit", "65536");

MPI_File_open(MPI_COMM_WORLD, "/pfs/datafile",

MPI_MODE_CREATE | MPI_MODE_RDWR, info, &fh);

MPI_Info_free(&info);