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sztest.c
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sztest.c
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#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include "sz.h"
#define SET_DATA_ROWS 2
#define SET_DATA_COLS 4
double check_err(double *a, double *b, size_t n,
double *out_max_diff, int *out_max_diff_idx);
void *malloc_or_die(size_t n);
unsigned char *test_roundtrip(double *data, unsigned int n,
double abs_bound,
int r5, int r4, int r3, int r2, int r1);
int main(int argc, char **argv) {
if (argc != 4) {
fprintf(stderr, "Usage: sztest ROWS COLS ERR_EXP\n");
exit(EXIT_FAILURE);
}
int rows = atoi(argv[1]);
int cols = atoi(argv[2]);
int err_exp = atoi(argv[3]);
if (err_exp > 0)
err_exp = -1 * err_exp;
double abs_bound = pow(10, err_exp);
size_t n = rows*cols;
size_t data_size = n * sizeof(double);
printf("size %dx%d, %zd bytes\n", rows, cols, data_size);
double *rand_data = malloc_or_die(data_size);
double *lin_data = malloc_or_die(data_size);
double *const_data = malloc_or_die(data_size);
double *near1_data = malloc_or_die(data_size);
double set_data[SET_DATA_ROWS][SET_DATA_COLS] = {
{ 1.0, 383.2384, -77777777777, 111111112128178324 },
{ 68123.00, 0.007, 99.99999, 111111112128178329 },
};
srand48(2895720909174927L);
//printf("sizeof = %zd\n", sizeof(const_data[0][0]));
double v = 0.0;
int ij = 0;
for (int i=0; i<rows; i++) {
for (int j=0; j<cols; j++) {
ij = i * cols + j;
rand_data[ij] = drand48() * 1024;
lin_data[ij] = v;
const_data[ij] = 1.0;
near1_data[ij] = 1.0 + drand48();
v += 0.1;
//printf("%d %d %p\n", i, j, &rand_data[i][j]);
}
}
int rval = SZ_Init("sz.config");
if (rval != 0) {
fprintf(stderr, "Failed to load sz.config, exiting\n");
exit(EXIT_FAILURE);
}
printf("\n== RAND ==\n");
unsigned char *rand_out =
test_roundtrip(rand_data, n, abs_bound, 0, 0, 0, rows, cols);
printf("\n== LIN ==\n");
unsigned char *lin_out =
test_roundtrip(lin_data, n, abs_bound, 0, 0, 0, rows, cols);
printf("\n== CONST ==\n");
unsigned char *const_out =
test_roundtrip(const_data, n, abs_bound, 0, 0, 0, rows, cols);
printf("\n== NEAR1 ==\n");
unsigned char *near1_out =
test_roundtrip(near1_data, n, abs_bound, 0, 0, 0, rows, cols);
printf("\n== SET ==\n");
unsigned char *set_out =
test_roundtrip(&set_data[0][0], SET_DATA_ROWS*SET_DATA_COLS,
abs_bound, 0, 0, 0, SET_DATA_ROWS, SET_DATA_COLS);
free(rand_data);
free(lin_data);
free(const_data);
free(near1_data);
free(set_out);
free(rand_out);
free(lin_out);
free(const_out);
free(near1_out);
SZ_Finalize();
}
// Returns average error, and max diff and max diff index in out params.
double check_err(double *a, double *b, size_t n,
double *out_max_diff, int *out_max_diff_idx) {
double diff;
double total_error = 0;
*out_max_diff = 0;
*out_max_diff_idx = 0;
for (int i=0; i<n; i++) {
diff = fabs(a[i] - b[i]);
if (diff > *out_max_diff) {
*out_max_diff = diff;
*out_max_diff_idx = i;
}
total_error += diff;
}
return total_error / n;
}
unsigned char *test_roundtrip(double *data, unsigned int n,
double abs_bound,
int r5, int r4, int r3, int r2, int r1) {
int out_size;
double *data2 = malloc_or_die(n * sizeof(double));
unsigned char *out = SZ_compress_args(SZ_DOUBLE, data, &out_size,
ABS, abs_bound, 0,
r5, r4, r3, r2, r1);
printf("out_size = %d (%0.4f)\n", out_size,
(double)out_size / (n * sizeof(double)));
printf("out = %p\n", out);
printf("abs bound = %0.16f\n", abs_bound);
SZ_decompress_args(SZ_DOUBLE, out, out_size, data2,
r5, r4, r3, r2, r1);
if (memcmp(data, data2, n * sizeof(double)) != 0) {
printf("roundtrip differs\n");
}
double max_diff = 0;
int max_diff_idx = 0;
double avg_error = check_err(data, data2, n, &max_diff, &max_diff_idx);
if (max_diff > abs_bound) {
fprintf(stderr,
"ERR: data error out of range at [%d]: "
"orig %0.16f decomp %0.16f (diff %0.16f)\n",
max_diff_idx, data[max_diff_idx],
data2[max_diff_idx], max_diff);
}
printf("avg error = %0.16f\n", avg_error);
free(data2);
return out;
}
void *malloc_or_die(size_t data_size) {
void *p = malloc(data_size);
if (p == NULL) {
fprintf(stderr, "malloc size %zd failed\n", data_size);
exit(EXIT_FAILURE);
}
return p;
}