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/*********************************************************************
*
* Copyright (C) 2014, Northwestern University and Argonne National Laboratory
* See COPYRIGHT notice in top-level directory.
*
*********************************************************************/
/* $Id$ */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* This example creates a new file and add 2 global attributes, one is of text
* type and the other 10 short integers. The file is closed and re-opened to
* read back the attributes.
*
* To compile:
* mpicc -O2 global_attributes.c -o global_attributes -lpnetcdf
*
* Example commands for MPI run and outputs from running ncmpidump on the
* netCDF file produced by this example program:
*
* % mpiexec -n 4 ./global_attributes /pvfs2/wkliao/testfile.nc
*
* % ncmpidump /pvfs2/wkliao/testfile.nc
* netcdf testfile {
* // file format: CDF-1
*
* // global attributes:
* :history = "Mon Aug 13 21:27:48 2018" ;
* "" ;
* :digits = 0s, 1s, 2s, 3s, 4s, 5s, 6s, 7s, 8s, 9s ;
* }
*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#include <stdio.h>
#include <stdlib.h>
#include <string.h> /* strcpy(), strncpy(), strlen() */
#include <unistd.h> /* getopt() */
#include <time.h> /* time() localtime(), asctime() */
#include <mpi.h>
#include <pnetcdf.h>
static int verbose;
#define ERR {if(err!=NC_NOERR){printf("Error at %s:%d : %s\n", __FILE__,__LINE__, ncmpi_strerror(err));nerrs++;}}
static void
usage(char *argv0)
{
char *help =
"Usage: %s [-h] | [-q] [file_name]\n"
" [-h] Print help\n"
" [-q] Quiet mode (reports when fail)\n"
" [filename] output netCDF file name\n";
fprintf(stderr, help, argv0);
}
/*----< pnetcdf_check_mem_usage() >------------------------------------------*/
/* check PnetCDF library internal memory usage */
static int
pnetcdf_check_mem_usage(MPI_Comm comm)
{
int err, nerrs=0, rank;
MPI_Offset malloc_size, sum_size;
MPI_Comm_rank(comm, &rank);
/* print info about PnetCDF internal malloc usage */
err = ncmpi_inq_malloc_max_size(&malloc_size);
if (err == NC_NOERR) {
MPI_Reduce(&malloc_size, &sum_size, 1, MPI_OFFSET, MPI_SUM, 0, MPI_COMM_WORLD);
if (rank == 0 && verbose)
printf("maximum heap memory allocated by PnetCDF internally is %lld bytes\n",
sum_size);
/* check if there is any PnetCDF internal malloc residue */
err = ncmpi_inq_malloc_size(&malloc_size);
MPI_Reduce(&malloc_size, &sum_size, 1, MPI_OFFSET, MPI_SUM, 0, MPI_COMM_WORLD);
if (rank == 0 && sum_size > 0)
printf("heap memory allocated by PnetCDF internally has %lld bytes yet to be freed\n",
sum_size);
}
else if (err != NC_ENOTENABLED) {
printf("Error at %s:%d: %s\n", __FILE__,__LINE__,ncmpi_strerror(err));
nerrs++;
}
return nerrs;
}
int main(int argc, char** argv)
{
extern int optind;
char filename[256];
char str_att[128], att_name[NC_MAX_NAME];
int i, rank, err, nerrs=0, ncid, ngatts;
short short_att[10], digit[10] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
time_t ltime;
MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
verbose = 1;
/* get command-line arguments */
while ((i = getopt(argc, argv, "hq")) != EOF)
switch(i) {
case 'q': verbose = 0;
break;
case 'h':
default: if (rank==0) usage(argv[0]);
MPI_Finalize();
return 1;
}
if (argv[optind] == NULL) strcpy(filename, "testfile.nc");
else snprintf(filename, 256, "%s", argv[optind]);
/* create a new file for writing ----------------------------------------*/
err = ncmpi_create(MPI_COMM_WORLD, filename, NC_CLOBBER, MPI_INFO_NULL, &ncid);
ERR
/* add a global attribute named "history": a time stamp at rank 0 */
ltime = time(NULL); /* get the current calendar time */
asctime_r(localtime(<ime), str_att);
sprintf(str_att, "Mon Aug 13 21:27:48 2018");
/* make sure the time string are consistent among all processes */
MPI_Bcast(str_att, (int)strlen(str_att), MPI_CHAR, 0, MPI_COMM_WORLD);
err = ncmpi_put_att_text(ncid, NC_GLOBAL, "history", strlen(str_att),
&str_att[0]); ERR
if (rank == 0 && verbose)
printf("writing global attribute \"history\" of text %s\n", str_att);
/* add another global attribute named "digits": an array of short type */
err = ncmpi_put_att_short(ncid, NC_GLOBAL, "digits", NC_SHORT, 10,
&digit[0]); ERR
if (rank == 0 && verbose)
printf("writing global attribute \"digits\" of 10 short integers\n");
/* close file */
err = ncmpi_close(ncid); ERR
/* open the newly created file for read only -----------------------------*/
err = ncmpi_open(MPI_COMM_WORLD, filename, NC_NOWRITE, MPI_INFO_NULL, &ncid); ERR
/* find the number of global attributes */
err = ncmpi_inq_natts(ncid, &ngatts); ERR
if (ngatts != 2) {
printf("Error at line %d in %s: expected number of global attributes is 2, but got %d\n",
__LINE__,__FILE__,ngatts);
nerrs++;
}
/* find the name of first global attribute */
err = ncmpi_inq_attname(ncid, NC_GLOBAL, 0, att_name); ERR
if (strncmp(att_name, "history", strlen("history"))) {
printf("Error at line %d in %s: expected attribute name \"history\", but got %s\n",
__LINE__,__FILE__,att_name);
nerrs++;
}
/* read attribute value */
err = ncmpi_get_att_text(ncid, NC_GLOBAL, att_name, &str_att[0]); ERR
/* find the name of second global attribute */
err = ncmpi_inq_attname(ncid, NC_GLOBAL, 1, att_name); ERR
if (strncmp(att_name, "digits", strlen("digits"))) {
printf("Error at line %d in %s: expected attribute name \"digits\", but got %s\n",
__LINE__,__FILE__,att_name);
nerrs++;
}
/* read attribute value */
err = ncmpi_get_att_short(ncid, NC_GLOBAL, att_name, &short_att[0]); ERR
/* close file */
err = ncmpi_close(ncid); ERR
nerrs += pnetcdf_check_mem_usage(MPI_COMM_WORLD);
MPI_Finalize();
return (nerrs > 0);
}
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