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Ed Hartnett 2018-05-14 08:49:13 -06:00
parent fd23cb3cf2
commit 271abc6bcb
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nc_test4/tst_parallel5.c Normal file
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/* Copyright 2018, UCAR/Unidata See COPYRIGHT file for copying and
* redistribution conditions.
*
* This program tests netcdf-4 parallel I/O. In this test I write data
* on one task, while writing 0 items on others.
*
* Ed Hartnett
*/
#include <nc_tests.h>
#include "err_macros.h"
#include <mpi.h>
#define FILE "tst_parallel5.nc"
#define NDIMS 3
#define DIMSIZE 4
#define NUM_PROC 4
#define NUM_SLABS 10
int
main(int argc, char **argv)
{
int mpi_size, mpi_rank;
MPI_Comm comm = MPI_COMM_WORLD;
MPI_Info info = MPI_INFO_NULL;
int ncid, v1id, dimids[NDIMS];
size_t start[NDIMS], count[NDIMS];
int data = TEST_VAL_42;
int i, res;
int slab_data[DIMSIZE * DIMSIZE / 4]; /* one slab */
char file_name[NC_MAX_NAME + 1];
/* Initialize MPI. */
MPI_Init(&argc,&argv);
MPI_Comm_size(MPI_COMM_WORLD, &mpi_size);
MPI_Comm_rank(MPI_COMM_WORLD, &mpi_rank);
/* Require exactly 4 tasks. */
if (mpi_size != NUM_PROC) ERR;
if (!mpi_rank)
{
printf("\n*** tst_parallel testing collective parallel access.\n");
printf("*** tst_parallel testing whether we can write 0 elements from some tasks...");
}
/* Create a parallel netcdf-4 file. */
/*nc_set_log_level(3);*/
sprintf(file_name, "%s/%s", TEMP_LARGE, FILE);
if (nc_create_par(file_name, NC_NETCDF4|NC_MPIIO, comm, info, &ncid)) ERR;
/* Create a dimension. */
if (nc_def_dim(ncid, "d1", DIMSIZE, dimids)) ERR;
if (nc_def_dim(ncid, "d2", DIMSIZE, &dimids[1])) ERR;
if (nc_def_dim(ncid, "d3", NUM_SLABS, &dimids[2])) ERR;
/* Create one var. */
if (nc_def_var(ncid, "v1", NC_INT, NDIMS, dimids, &v1id)) ERR;
/* Write metadata to file. */
if (nc_enddef(ncid)) ERR;
/* /\* Set up slab for this process. *\/ */
/* start[0] = mpi_rank * DIMSIZE/mpi_size; */
/* start[1] = 0; */
/* count[0] = DIMSIZE/mpi_size; */
/* count[1] = DIMSIZE; */
/* count[2] = 1; */
/* /\*printf("mpi_rank=%d start[0]=%d start[1]=%d count[0]=%d count[1]=%d\n", */
/* mpi_rank, start[0], start[1], count[0], count[1]);*\/ */
/* if (nc_var_par_access(ncid, v1id, NC_COLLECTIVE)) ERR; */
/* /\* if (nc_var_par_access(ncid, v1id, NC_INDEPENDENT)) ERR;*\/ */
/* /\* Write slabs of phoney data. *\/ */
/* for (start[2] = 0; start[2] < NUM_SLABS; start[2]++) */
/* if (nc_put_vara_int(ncid, v1id, start, count, slab_data)) ERR; */
/* Close the netcdf file. */
if (nc_close(ncid)) ERR;
/* Shut down MPI. */
MPI_Finalize();
if (!mpi_rank)
{
SUMMARIZE_ERR;
FINAL_RESULTS;
}
return 0;
}