2012 Unidata NetCDF Workshop > Parallel I/O with NetCDF
35.8 Example of Simple Parallel I/O Access
The nc_test4/tst_parallel3.c program provides an example of parallel I/O.
/* Initialize MPI. */
MPI_Comm_size(MPI_COMM_WORLD, &mpi_size);
MPI_Comm_rank(MPI_COMM_WORLD, &mpi_rank);
/* Create a parallel netcdf-4 file. */
if ((res = nc_create_par(FILENAME, facc_type, comm, info, &ncid)))
BAIL(res);
/* The first case is two dimensional variables, no unlimited
dimension */
/* Create two dimensions. */
if ((res = nc_def_dim(ncid, "d1", DIMSIZE2, dimids)))
BAIL(res);
if ((res = nc_def_dim(ncid, "d2", DIMSIZE, &dimids[1])))
BAIL(res);
/* Create one var. */
if ((res = nc_def_var(ncid, "v1", NC_INT, NDIMS1, dimids, &nvid)))
BAIL(res);
if ((res = nc_enddef(ncid)))
BAIL(res);
2012 Unidata NetCDF Workshop > Parallel I/O with NetCDF