gistfile1.cpp

#include <stdio.h>
#include <chrono>
#include <x86intrin.h>
#include <unistd.h>

struct rdtsc_clock {                                                                                                                                                                               
    typedef unsigned long long                   rep;                                                                                                                                              
    typedef std::ratio<1, 2800098000>            period; // /proc/cpuinfo says 2800.098 for cpu MHz                                                                                                
    typedef std::chrono::duration<rep, period>   duration;                                                                                                                                         
    typedef std::chrono::time_point<rdtsc_clock> time_point;                                                                                                                                       
    static const bool is_steady =                true;                                                                                                                                             
                                                                                                                                                                                                   
    static time_point now() noexcept                                                                                                                                                               
    {                                                                                                                                                                                              
        return time_point(duration(static_cast<rep>(__rdtsc())));                                                                                                                                  
    }                                                                                                                                                                                              
};                                                                                                                                                                                                 

int
main()
{
  rdtsc_clock::time_point start = rdtsc_clock::now();
  sleep(10);
  rdtsc_clock::time_point end = rdtsc_clock::now();

  printf ("%ld ms\n", std::chrono::duration_cast<std::chrono::milliseconds>(end - start).count());
}