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80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
/* This is part of the netCDF package. Copyright 2005-2018 University
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Corporation for Atmospheric Research/Unidata See COPYRIGHT file for
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conditions of use.
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This program benchmarks creating a netCDF file with many objects.
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Ed Hartnett
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*/
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#include <config.h>
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#include <nc_tests.h>
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#include "err_macros.h"
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#include <netcdf.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <sys/time.h> /* Extra high precision time info. */
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/* We will create this file. */
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#define FILE_NAME "bm_many_atts.nc"
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/* Prototype from tst_utils.c. */
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int nc4_timeval_subtract(struct timeval *result, struct timeval *x,
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struct timeval *y);
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int main(int argc, char **argv)
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{
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struct timeval start_time, end_time, diff_time;
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double sec;
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int nitem = 1000; /* default number of objects of each type */
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int i;
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int ncid;
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int data[] = {42};
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int g, grp, numgrp;
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char gname[16];
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int a, numatt, an, aleft, natts;
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if(argc > 2) { /* Usage */
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printf("NetCDF performance test, writing many groups, variables, and attributes.\n");
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printf("Usage:\t%s [N]\n", argv[0]);
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printf("\tN: number of objects\n");
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return(0);
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}
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for(i = 1; i < argc; i++) {
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nitem = atoi(argv[i]);
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}
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/* create new file */
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if (nc_create(FILE_NAME, NC_NETCDF4, &ncid)) ERR;
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/* create N group/global attributes, printing time after every 100.
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* Because only NC_MAX_ATTRS are permitted per group, create the
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* necessary number of groups to hold nitem attributes. */
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numatt = nitem;
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a = 1;
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numgrp = (numatt - 1) / NC_MAX_ATTRS + 1;
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aleft = numatt - (NC_MAX_ATTRS * (numgrp - 1));
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if (gettimeofday(&start_time, NULL))
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ERR;
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for(g = 1; g < numgrp + 1; g++) {
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snprintf(gname, sizeof(gname), "group%d", g);
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if (nc_def_grp(ncid, gname, &grp)) ERR;
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natts = g < numgrp ? NC_MAX_ATTRS : aleft; /* leftovers on last time through */
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for(an = 1; an < natts + 1; an++) {
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char aname[20];
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snprintf(aname, sizeof(aname), "attribute%d", a);
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if (nc_put_att_int(grp, NC_GLOBAL, aname, NC_INT, 1, data)) ERR;
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if(a%100 == 0) { /* only print every 100th attribute name */
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if (gettimeofday(&end_time, NULL)) ERR;
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if (nc4_timeval_subtract(&diff_time, &end_time, &start_time)) ERR;
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sec = diff_time.tv_sec + 1.0e-6 * diff_time.tv_usec;
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printf("%s/%s\t%.3g sec\n", gname, aname, sec);
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}
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a++;
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}
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}
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nc_close(ncid);
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FINAL_RESULTS;
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}
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