Time Check

use gettimeofday

double gettime() 
{
 timeval t;
 gettimeofday(&t,0);
 return (double)(t.tv_sec)+(double)(t.tv_usec)/1000000.0;
}

use asm(CPU가 2.8GHz라면..)

double gettime()

{

unsigned long long time;

__asm__ volatile("rdtsc" : "=A" (time));

return time / 2.8e9;

}