MemBenchmark.cpp

// BlogBenchmarks.cpp : Defines the entry point for the console application.
//

#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <ctime>
#include <vector>
#include <list>
#include <utility>
#include <string>

using namespace std;

struct benchmark
{
    benchmark(const wchar_t* message)
        : m_msg(message)
    {
        m_start = time(NULL);
        std::wcout << m_msg << L" started" << std::endl;
    }

    ~benchmark()
    {
        std::wcout << m_msg << L": " << time(NULL) - m_start << L" sec" << std::endl;
    }

    time_t m_start;
    const wchar_t* m_msg;
};


const size_t totalSize = 100000000; // 100 million bytes
void allocs_1()
{
    for (int i = 0; i < totalSize / 4; i++)
        new int;
}

void allocs_2()
{
    for (int i = 0; i < totalSize / 40; i++)
        new int[10];
}

void allocs_3()
{
    for (int i = 0; i < totalSize / 400; i++)
        new int[100];

}

void allocs_4()
{
    for (int i = 0; i < totalSize / 4000; i++)
        new int[1000];
}

void allocs_5()
{
    for (int i = 0; i < totalSize / 40000; i++)
        new int[10000];
}

int main(int argc, char* argv[])
{
    std::string dummy;
    std::wcout << L"Press Enter to start" << std::endl;
    std::getline(std::cin, dummy);

    allocs_1();
    std::wcout << L"Allocs 1 completed" << std::endl;
    std::getline(std::cin, dummy);

    allocs_2();
    std::wcout << L"Allocs 2 completed" << std::endl;
    std::getline(std::cin, dummy);

    allocs_3();
    std::wcout << L"Allocs 3 completed" << std::endl;
    std::getline(std::cin, dummy);

    allocs_4();
    std::wcout << L"Allocs 4 completed" << std::endl;
    std::getline(std::cin, dummy);

    allocs_5();
    std::wcout << L"Allocs 5 completed" << std::endl;
    std::getline(std::cin, dummy);

    return 0;
}