malloc(), calloc() and realloc() benchmarks.

#include <iostream>
#include <cstdlib>
#include <time.h>

#define ITERATIONS 800000

int main() {
    clock_t clock1, clock2;
    char *buffer;

    std::cout.precision(15);

    std::cout << "Resolution: " << CLOCKS_PER_SEC << " ticks per second." << std::endl;

    clock1 = clock();
    for( int index = 0; index <= ITERATIONS; index++)
    {
        buffer = (char *) malloc( index+1);
        buffer[index] = index;
        free( buffer);
    }
    clock2 = clock();

    std::cout << "Malloc: " << double( (clock2 - clock1 )) / CLOCKS_PER_SEC << "s" << std::endl;

    clock1 = clock();
    for( int index = 0; index <= ITERATIONS; index++)
    {
        buffer = (char *) calloc( index+1, 1);
        buffer[index] = index;
        free( buffer);
    }
    clock2 = clock();

    std::cout << "Calloc: " << double( ( clock2 - clock1 )) / CLOCKS_PER_SEC << "s" << std::endl;

    buffer = (char *) malloc( 1);
    clock1 = clock();
    for( int index = 0; index <= ITERATIONS; index++)
    {
        buffer = (char *) realloc( buffer, index+1);
        buffer[index] = index;
    }
    free( buffer);
    clock2 = clock();

    std::cout << "Realloc: " << double( (clock2 - clock1 )) / CLOCKS_PER_SEC << "s" << std::endl;

    clock1 = clock();
    for( int index = 0; index <= ITERATIONS; index++)
    {
        buffer = (char *) malloc( ( index+1) * sizeof(long) );
        buffer[index] = index;
        free( buffer);
    }
    clock2 = clock();

    std::cout << "Malloc 2: " << double( (clock2 - clock1 )) / CLOCKS_PER_SEC << "s" << std::endl;

    clock1 = clock();
    for( int index = 0; index <= ITERATIONS; index++)
    {
        buffer = (char *) calloc( index+1, sizeof(long));
        buffer[index] = index;
        free( buffer);
    }
    clock2 = clock();

    std::cout << "Calloc 2: " << double( ( clock2 - clock1 )) / CLOCKS_PER_SEC << "s" << std::endl;

    buffer = (char *) malloc( sizeof(long));
    clock1 = clock();
    for( int index = 0; index <= ITERATIONS; index++)
    {
        buffer = (char *) realloc( buffer, (index+1) * sizeof(long));
        buffer[index] = index;
    }
    free( buffer);
    clock2 = clock();

    std::cout << "Realloc 2: " << double( (clock2 - clock1 )) / CLOCKS_PER_SEC << "s" << std::endl;
}