benchmark.cpp

#include <cstdlib>
#include <cstdio>
#include <cmath>
#include <cstring>
#include <cstdint>
#include <algorithm>
#include <time.h>

double getTime() {
	struct timespec ts;
	clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
	int64_t time = int64_t(ts.tv_sec) * 1000000000LL + ts.tv_nsec;
	return time / 1e9;
}

template <typename F>
void benchmark(uint64_t n, F f) {
	double sum = 0.0;
	double sum2 = 0.0;
	double min = INFINITY;
	double max = 0.0;
	for (uint64_t j = 0; j < n; j++) {
		double start = getTime();
		f();
		double end = getTime();
		double t = end - start;
		sum += t;
		sum2 += t*t;
		min = std::min(min, t);
		max = std::max(max, t);
	}
	printf("mean: %8g ", sum / n);
	printf("stddev: %8g ", std::sqrt((sum2 / n) - std::pow(sum / n, 2)));
	printf("min: %8g ", min);
	printf("max: %8g\n", max);
}

int main() {
	benchmark(1000000ll, [&]() {
		// ...
	});

	return 0;
}