Mesurer le temps d'exécution d'une portion de code sous GNU/Linux en C++.

#include <iostream>
#include <stdlib.h>
#include <sys/time.h>
#include <cstdlib>

int main()
{
  struct timeval start, end;

  long mtime, seconds, useconds;    

  gettimeofday(&start, NULL);
  for(int i=10000000; --i>0;) 
  {
    int a = rand();
    int b = rand();
    a/=b;
  }
  gettimeofday(&end, NULL);

  seconds  = end.tv_sec  - start.tv_sec;
  useconds = end.tv_usec - start.tv_usec;

  mtime = ((seconds) * 1000 + useconds/1000.0) + 0.5;
  std::cout << "(int) Elapsed time: " << mtime << " ms\n";

  return EXIT_SUCCESS;
}