static void update_count() {
time_t curr = time(NULL);
text_layer_set_text(s_count_data_layer, time_between(curr, checktime));
}
void test_fft(size_t size, double time = 1.5)
{
const tick_value correction = 0;//calibrate_correction();
printf("> [%9ld, ", (long)size);
real* in = aligned_malloc<real>(size * 2);
real* out = aligned_malloc<real>(size * 2);
fill_random(in, size * 2);
std::copy(in, in + size * 2, out);
fft_benchmark<false> fft(size, out, out);
fft.execute();
fill_random(in, size * 2);
std::vector<tick_value> measures;
const tick_value bench_tick_start = tick();
const time_value bench_start = now();
while (time_between(now(), bench_start) < time)
{
const tick_value start = tick();
fft.execute();
const tick_value stop = tick();
const tick_value diff = stop - start;
measures.push_back(diff >= correction ? diff - correction : 0);
fill_random(in, size * 2);
dont_optimize(out);
std::copy(in, in + size * 2, out);
}
const tick_value bench_tick_stop = tick();
const time_value bench_stop = now();
const double tick_frequency =
(long double)(bench_tick_stop - bench_tick_start) / time_between(bench_stop, bench_start);
tick_value tick_value = get_minimum(measures);
double time_value = tick_value / tick_frequency;
const double flops = (5.0 * size * std::log((double)size) / (std::log(2.0) * time_value));
const char* units = "'s' ";
if (time_value < 0.000001)
{
units = "'ns'";
time_value = time_value * 1000000000.0;
}
else if (time_value < 0.001)
{
units = "'us'";
time_value = time_value * 1000000.0;
}
else if (time_value < 1.0)
{
units = "'ms'";
time_value = time_value * 1000.0;
}
printf("%9lld, ", tick_value);
printf("%7g, %s, ", time_value, units);
printf("%7g, ", flops / 1000000.0);
printf("%8lld, ", measures.size());
printf("%8.6f],\n", tick_frequency / 1000000000.0);
aligned_free(in);
aligned_free(out);
}
/* Nanoseconds per operation */
static size_t normalize(const struct timeabs *start,
const struct timeabs *stop,
unsigned int num)
{
return time_to_nsec(time_divide(time_between(*stop, *start), num));
}