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285 lines
7.7 KiB
C
285 lines
7.7 KiB
C
/*
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Copyright 2007, UCAR/Unidata
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See COPYRIGHT file for copying and redistribution conditions.
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This program benchmarks the write and read of some radar files with
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different chunking and compression parameters set.
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$Id: bm_radar.c,v 1.6 2008/12/11 16:40:03 russ Exp $
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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 <string.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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#include <math.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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/* This is one megabyte (2^20), in decimal. */
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#define MEGABYTE 1048576
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/* We will create this file. */
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#define FILE_NAME "bm_radar.nc"
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int
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file_size(char* name)
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{
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struct stat stbuf;
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stat(name, &stbuf);
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return stbuf.st_size;
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}
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/* Copy a netCDF file, changing cmode if desired. */
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static
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int copy_file(char *file_name_in, char *file_name_out, int cmode_out,
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int *chunking, int *deflate)
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{
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int ncid_in, ncid_out;
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int natts, nvars, ndims, unlimdimid;
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char name[NC_MAX_NAME + 1];
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size_t len;
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int a, v, d;
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if (nc_open(file_name_in, NC_NOWRITE, &ncid_in)) ERR;
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if (nc_create(file_name_out, cmode_out, &ncid_out)) ERR;
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if (nc_inq(ncid_in, &ndims, &nvars, &natts, &unlimdimid)) ERR;
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/* Copy dims. */
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for (d = 0; d < ndims; d++)
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{
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if (nc_inq_dim(ncid_in, d, name, &len)) ERR;
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if (nc_def_dim(ncid_out, name, len, NULL)) ERR;
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}
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/* Copy global atts. */
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for (a = 0; a < natts; a++)
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{
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if (nc_inq_attname(ncid_in, NC_GLOBAL, a, name)) ERR;
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if (nc_copy_att(ncid_in, NC_GLOBAL, name, ncid_out, NC_GLOBAL)) ERR;
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}
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/* Copy the variable metadata. */
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for (v = 0; v < nvars; v++)
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{
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char name[NC_MAX_NAME + 1];
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char att_name[NC_MAX_NAME + 1];
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nc_type xtype;
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int ndims, dimids[NC_MAX_VAR_DIMS], natts;
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int varid_out;
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int a;
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int retval = NC_NOERR;
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/* Learn about this var. */
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if ((retval = nc_inq_var(ncid_in, v, name, &xtype, &ndims, dimids, &natts)))
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return retval;
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/* Create the output var. */
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if (nc_def_var(ncid_out, name, xtype, ndims, dimids, &varid_out)) ERR;
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/* Except for 1D vars, sent chunking and compression. */
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if (ndims != 1)
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{
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if (chunking)
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if (nc_def_var_chunking(ncid_out, v, NC_CHUNKED, chunking)) ERR;
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if (deflate)
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if (nc_def_var_deflate(ncid_out, v, NC_NOSHUFFLE, *deflate, *deflate)) ERR;
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}
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/* Copy the attributes. */
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for (a=0; a<natts; a++)
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{
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if (nc_inq_attname(ncid_in, v, a, att_name)) ERR;
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if (nc_copy_att(ncid_in, v, att_name, ncid_out, varid_out)) ERR;
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}
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}
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/* Copy the variable data. */
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for (v = 0; v < nvars; v++)
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{
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char name[NC_MAX_NAME + 1];
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nc_type xtype;
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int ndims, dimids[NC_MAX_VAR_DIMS], natts, real_ndims;
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int d;
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void *data = NULL;
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size_t *count = NULL, *start = NULL;
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size_t reclen = 1;
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size_t *dimlen = NULL;
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int retval = NC_NOERR;
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size_t type_size;
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char type_name[NC_MAX_NAME+1];
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/* Learn about this var. */
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if ((retval = nc_inq_var(ncid_in, v, name, &xtype, &ndims, dimids, &natts)))
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return retval;
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/* Later on, we will need to know the size of this type. */
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if ((retval = nc_inq_type(ncid_in, xtype, type_name, &type_size)))
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return retval;
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LOG((3, "type %s has size %d", type_name, type_size));
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/* Allocate memory for our start and count arrays. If ndims = 0
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this is a scalar, which I will treat as a 1-D array with one
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element. */
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real_ndims = ndims ? ndims : 1;
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if (!(start = nc_malloc(real_ndims * sizeof(size_t))))
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BAIL(NC_ENOMEM);
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if (!(count = nc_malloc(real_ndims * sizeof(size_t))))
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BAIL(NC_ENOMEM);
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/* The start array will be all zeros, except the first element,
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which will be the record number. Count will be the dimension
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size, except for the first element, which will be one, because
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we will copy one record at a time. For this we need the var
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shape. */
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if (!(dimlen = nc_malloc(real_ndims * sizeof(size_t))))
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BAIL(NC_ENOMEM);
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/* Find out how much data. */
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for (d=0; d<ndims; d++)
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{
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if ((retval = nc_inq_dimlen(ncid_in, dimids[d], &dimlen[d])))
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BAIL(retval);
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LOG((4, "nc_copy_var: there are %d data", dimlen[d]));
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}
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/* If this is really a scalar, then set the dimlen to 1. */
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if (ndims == 0)
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dimlen[0] = 1;
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for (d=0; d<real_ndims; d++)
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{
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start[d] = 0;
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count[d] = d ? dimlen[d] : 1;
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if (d) reclen *= dimlen[d];
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}
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/* If there are no records, we're done. */
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if (!dimlen[0])
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goto exit;
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/* Allocate memory for one record. */
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if (!(data = nc_malloc(reclen * type_size)))
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return NC_ENOMEM;
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/* Copy the var data one record at a time. */
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for (start[0]=0; !retval && start[0]<(size_t)dimlen[0]; start[0]++)
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{
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if (nc_get_vara(ncid_in, v, start, count, data)) ERR;
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if (nc_put_vara(ncid_out, v, start, count, data)) ERR;
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}
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exit:
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if (data) nc_free(data);
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if (dimlen) nc_free(dimlen);
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if (start) nc_free(start);
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if (count) nc_free(count);
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}
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if (nc_close(ncid_in)) ERR;
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if (nc_close(ncid_out)) ERR;
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return NC_NOERR;
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}
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/* Subtract the `struct timeval' values X and Y, storing the result in
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RESULT. Return 1 if the difference is negative, otherwise 0. This
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function from the GNU documentation. */
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int
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timeval_subtract (result, x, y)
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struct timeval *result, *x, *y;
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{
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/* Perform the carry for the later subtraction by updating Y. */
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if (x->tv_usec < y->tv_usec) {
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int nsec = (y->tv_usec - x->tv_usec) / 1000000 + 1;
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y->tv_usec -= 1000000 * nsec;
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y->tv_sec += nsec;
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}
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if (x->tv_usec - y->tv_usec > 1000000) {
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int nsec = (x->tv_usec - y->tv_usec) / 1000000;
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y->tv_usec += 1000000 * nsec;
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y->tv_sec -= nsec;
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}
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/* Compute the time remaining to wait.
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`tv_usec' is certainly positive. */
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result->tv_sec = x->tv_sec - y->tv_sec;
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result->tv_usec = x->tv_usec - y->tv_usec;
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/* Return 1 if result is negative. */
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return x->tv_sec < y->tv_sec;
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}
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#define INPUT_FILE "/upc/share/testdata/nssl/mosaic3d_nc/tile1/20070803-2300.netcdf"
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#define FILE_NAME1 "bm_radar1.nc"
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#define FILE_NAME2 "bm_radar2.nc"
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int
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main(int argc, char **argv)
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{
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printf("\n*** Benchmarking chunking and compression for radar file.\n");
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printf("\n*** Creating netCDF-4 file from netCDF-3 original...\n");
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{
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#define NDIMS 3
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#define NUM_TRIES 5
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#define MAX_DEFLATE 9
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struct timeval start_time, end_time, diff_time;
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int chunking[NDIMS];
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int deflate;
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int chunk_size, i, d;
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int total_time;
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printf("input size, output size, chunking[0], chunking[1], chunking[3],"
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" chunk size, deflate, copy time usec\n");
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if (copy_file(INPUT_FILE, FILE_NAME, NC_NETCDF4, NULL, NULL)) ERR;
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for (deflate = 0; deflate < MAX_DEFLATE; deflate += 3)
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{
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chunking[0] = 1;
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chunking[1] = 100;
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chunking[2] = 100;
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for (i = 0; i < NUM_TRIES; i++)
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{
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if (gettimeofday(&start_time, NULL)) ERR;
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if (copy_file(FILE_NAME, FILE_NAME1, NC_NETCDF4, chunking, &deflate)) ERR;
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if (gettimeofday(&end_time, NULL)) ERR;
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if (timeval_subtract(&diff_time, &end_time, &start_time)) ERR;
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/* Print some output. */
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printf("%d, %d, ", file_size(FILE_NAME), file_size(FILE_NAME1));
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for (chunk_size = 1, d = 0; d < NDIMS; d++)
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{
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printf("%d, ", chunking[d]);
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chunk_size *= chunking[d];
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}
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total_time = (int)diff_time.tv_sec * 1000 + (int)diff_time.tv_usec;
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printf("%d, %d, %d", chunk_size, deflate, total_time);
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printf("\n");
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chunking[0] += 1;
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chunking[1] += 100;
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chunking[2] += 100;
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}
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}
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}
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SUMMARIZE_ERR;
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FINAL_RESULTS;
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}
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