Просьба потестить скорость RAM программы С/С++ (завершено)

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

typedef unsigned int uint32;

const int buf_size = 1024 * 1024 * 1024 / 4;
typedef int buf_type;
volatile int read_hack;

void test4write( buf_type *buf )
{
  for ( int i = 0; i < buf_size; i++ )
  {
    buf[ i ] = 0;
  };
};

void test4read( buf_type *buf )
{
  buf_type res = 0;
  for ( int i = 0; i < buf_size; i++ )
  {
    res += buf[ i ];
  };
  read_hack = res;
  //std::cout << "res: " << res << "\n";
};

typedef void (*fptr)(buf_type *);

void test( fptr fp, const char *label, buf_type *param )
{
  clock_t t = clock();
  fp( param );
  t = clock() - t;
  double x = ((double)t) / CLOCKS_PER_SEC;
  std::cout << label << " time: " << x << " sec => " << 1/x << " Gb/sec\n";
};

int main() 
{
  buf_type *buf = new buf_type[ buf_size ];
  test( test4write, "init write", buf );
  test( test4write, "write", buf );
  test( test4read, "read", buf );
  test( test4write, "write", buf );
  test( test4read, "read", buf );
  test( test4write, "write", buf );
  test( test4read, "read", buf );
  delete[] buf;
  return 0;
};

init write time: 0.38677 sec => 2.58552 Gb/sec
write time: 0.069858 sec => 14.3148 Gb/sec
read time: 0.090477 sec => 11.0525 Gb/sec
write time: 0.071743 sec => 13.9386 Gb/sec
read time: 0.083986 sec => 11.9067 Gb/sec
write time: 0.068788 sec => 14.5374 Gb/sec
read time: 0.083386 sec => 11.9924 Gb/sec

init write time: 0.401083 sec => 2.49325 Gb/sec
write time: 0.071134 sec => 14.058 Gb/sec
read time: 0.089171 sec => 11.2144 Gb/sec
write time: 0.071308 sec => 14.0237 Gb/sec
read time: 0.085003 sec => 11.7643 Gb/sec
write time: 0.070572 sec => 14.1699 Gb/sec
read time: 0.088204 sec => 11.3374 Gb/sec

init write time: 0.399044 sec => 2.50599 Gb/sec
write time: 0.071821 sec => 13.9235 Gb/sec
read time: 0.086017 sec => 11.6256 Gb/sec
write time: 0.074635 sec => 13.3985 Gb/sec
read time: 0.090383 sec => 11.064 Gb/sec
write time: 0.070578 sec => 14.1687 Gb/sec
read time: 0.086956 sec => 11.5001 Gb/sec

init write time: 0.414826 sec => 2.41065 Gb/sec
write time: 0.074819 sec => 13.3656 Gb/sec
read time: 0.09057 sec => 11.0412 Gb/sec
write time: 0.068362 sec => 14.628 Gb/sec
read time: 0.090503 sec => 11.0494 Gb/sec
write time: 0.068422 sec => 14.6152 Gb/sec
read time: 0.089787 sec => 11.1375 Gb/sec

init write time: 0.403768 sec => 2.47667 Gb/sec
write time: 0.07055 sec => 14.1743 Gb/sec
read time: 0.09119 sec => 10.9661 Gb/sec
write time: 0.065016 sec => 15.3808 Gb/sec
read time: 0.089203 sec => 11.2104 Gb/sec
write time: 0.067207 sec => 14.8794 Gb/sec
read time: 0.089024 sec => 11.2329 Gb/sec

init write time: 0.410251 sec => 2.43753 Gb/sec
write time: 0.077943 sec => 12.8299 Gb/sec
read time: 0.091687 sec => 10.9067 Gb/sec
write time: 0.068179 sec => 14.6673 Gb/sec
read time: 0.091495 sec => 10.9296 Gb/sec
write time: 0.066038 sec => 15.1428 Gb/sec
read time: 0.094873 sec => 10.5404 Gb/sec