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96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
/** \file
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This program benchmarks creating a netCDF file with many objects.
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Copyright 2010, UCAR/Unidata See COPYRIGHT file for copying and
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redistribution conditions.
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*/
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#include <config.h>
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#include <nc_tests.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_objs.nc"
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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 = 10000; /* 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 v, var, numvar, vn, vleft, nvars;
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if(argc > 2) { /* Usage */
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printf("NetCDF performance test, writing many groups and variables.\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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if (gettimeofday(&start_time, NULL))
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ERR;
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/* create N groups, printing time after every 1000 */
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numgrp = nitem;
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for(g = 1; g < numgrp + 1; g++) {
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sprintf(gname, "group%d", g);
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if (nc_def_grp(ncid, gname, &grp)) ERR;
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if (nc_def_var(grp, "var", NC_INT, 0, NULL, &var)) ERR;
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if(nc_enddef (grp)) ERR;
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if(nc_put_var(grp, var, data)) ERR;
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if(g%1000 == 0) { /* only print every 1000th group 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\t%.3g sec\n", gname, sec);
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}
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}
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nc_close(ncid);
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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 variables, printing time after every 1000. Because only
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* NC_MAX_VARS are permitted per group, create the necessary number
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* of groups to hold nitem variables. */
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numvar = nitem;
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v = 1;
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numgrp = (numvar - 1) / NC_MAX_VARS + 1;
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vleft = numvar - (NC_MAX_VARS * (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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sprintf(gname, "group%d", g);
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if (nc_def_grp(ncid, gname, &grp)) ERR;
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nvars = g < numgrp ? NC_MAX_VARS : vleft; /* leftovers on last time through */
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for(vn = 1; vn < nvars + 1; vn++) {
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int var;
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char vname[20];
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sprintf(vname, "variable%d", v);
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if(nc_def_var(grp, vname, NC_INT, 0, NULL, &var)) ERR;
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if(nc_put_var(grp, var, data)) ERR;
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if(v%1000 == 0) { /* only print every 1000th variable 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, vname, sec);
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}
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v++;
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}
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}
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nc_close(ncid);
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return(0);
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}
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