void calc_gradients_whole_pic(int *gradient, uint8_t *image,
int width, int height)
{
assert(gradient != NULL);
assert(image != NULL);
clock_t start;
#define BENCH_INIT(repetitions) \
start = clock(); \
for (int i = 0; i < repetitions; i++) {
#define BENCH_FINISH(method) \
} \
printf("\n[%s] elapsed time: %.4f\n", method, \
(double)(clock() - start) / CLOCKS_PER_SEC);
int repetitions = 50;
printf("benchmarking ... repetitions %d\n", repetitions);
BENCH_INIT(repetitions);
_calc_gradients_pix_by_pix(gradient, image, width, height);
BENCH_FINISH("OnePixelEachLoop");
BENCH_INIT(repetitions);
_calc_gradients_line_by_line(gradient, image, width, height);
BENCH_FINISH("OneLineEachLoop");
BENCH_INIT(repetitions);
_calc_gradients_by_mutiple_lines(gradient, image, width, height);
BENCH_FINISH("MultipleLinesEachLoop");
#undef BENCH_INIT
#undef BENCH_FINISH
/* printf("\nGradient Image:\n"); */
/* int i, j; */
/* for (j = 0; j < height; j++) { */
/* for (i = 0; i < width; i++) { */
/* printf("%3d ", gradient[j * width + i]); */
/* } */
/* printf("\n"); */
/* } */
}
int
main (int argc, char **argv)
{
unsigned long i, k;
struct timespec runtime;
timing_t start, end;
bool detailed = false;
json_ctx_t json_ctx;
if (argc == 2 && !strcmp (argv[1], "-d"))
detailed = true;
bench_start ();
memset (&runtime, 0, sizeof (runtime));
unsigned long iters, res;
#ifdef BENCH_INIT
BENCH_INIT ();
#endif
TIMING_INIT (res);
iters = 1000 * res;
json_init (&json_ctx, 2, stdout);
/* Begin function. */
json_attr_object_begin (&json_ctx, FUNCNAME);
for (int v = 0; v < NUM_VARIANTS; v++)
{
/* Run for approximately DURATION seconds. */
clock_gettime (CLOCK_MONOTONIC_RAW, &runtime);
runtime.tv_sec += DURATION;
double d_total_i = 0;
timing_t total = 0, max = 0, min = 0x7fffffffffffffff;
int64_t c = 0;
while (1)
{
for (i = 0; i < NUM_SAMPLES (v); i++)
{
uint64_t cur;
TIMING_NOW (start);
for (k = 0; k < iters; k++)
BENCH_FUNC (v, i);
TIMING_NOW (end);
TIMING_DIFF (cur, start, end);
if (cur > max)
max = cur;
if (cur < min)
min = cur;
TIMING_ACCUM (total, cur);
/* Accumulate timings for the value. In the end we will divide
by the total iterations. */
RESULT_ACCUM (cur, v, i, c * iters, (c + 1) * iters);
d_total_i += iters;
}
c++;
struct timespec curtime;
memset (&curtime, 0, sizeof (curtime));
clock_gettime (CLOCK_MONOTONIC_RAW, &curtime);
if (TIMESPEC_AFTER (curtime, runtime))
goto done;
}
double d_total_s;
double d_iters;
done:
d_total_s = total;
d_iters = iters;
/* Begin variant. */
json_attr_object_begin (&json_ctx, VARIANT (v));
json_attr_double (&json_ctx, "duration", d_total_s);
json_attr_double (&json_ctx, "iterations", d_total_i);
json_attr_double (&json_ctx, "max", max / d_iters);
json_attr_double (&json_ctx, "min", min / d_iters);
json_attr_double (&json_ctx, "mean", d_total_s / d_total_i);
if (detailed)
{
json_array_begin (&json_ctx, "timings");
for (int i = 0; i < NUM_SAMPLES (v); i++)
json_element_double (&json_ctx, RESULT (v, i));
json_array_end (&json_ctx);
}
/* End variant. */
json_attr_object_end (&json_ctx);
}
/* End function. */
json_attr_object_end (&json_ctx);
return 0;
}
