заготовка для проверки эффективности realloc

realloc_checker.c

#include <iostream>
#include <chrono>
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <fstream>

using namespace std;
using namespace std::chrono;

void function()
{
	high_resolution_clock::time_point t1;
	high_resolution_clock::time_point t2;
	FILE *f;

	int* many_numbers = NULL;
	int N = 1;
	many_numbers = (int*)malloc(N * sizeof(int));

	t1 = high_resolution_clock::now();
	auto prev = -1;
	float percent = 0.0f;

	f = fopen("int.txt", "a");

	for (N = 1; N < 1000000; N++)
	{
		many_numbers = (int*)realloc(many_numbers, N * sizeof(int));
		//printf("%d \n", many_numbers);
		if (N % 200000 == 0)
		{
			//cout << N << endl;
			t2 = high_resolution_clock::now();
			auto duration = duration_cast<milliseconds>(t2 - t1).count();
			
			percent = (float)duration / (float)prev;

			if (prev < 0)
				prev = duration;

			cout << N << " " << percent << "x " << "   " << duration << " ms" << endl;

			fprintf(f, "%d %f %d\n", N, percent, duration);

			t1 = high_resolution_clock::now();
		}

	}
	fprintf(f, "---\n");
	fclose(f);
}

int main()
{
	high_resolution_clock::time_point t1 = high_resolution_clock::now();
	for(int i = 0; i < 10; i++)
		function();
	high_resolution_clock::time_point t2 = high_resolution_clock::now();

	auto duration = duration_cast<microseconds>(t2 - t1).count();

	cout << duration << endl;
	return 0;
}