Sourcecodes - Frequenz des Prozessors ermitteln

Code:


#include <windows.h>
#include <iostream>
using namespace std;

/*UINT64 rdtsc()   //Für MSV C++
{
    __asm _emit 0x0F
    __asm _emit 0x31
}*/

UINT64 rdtsc()     //Für Dev-C++
{
    UINT64 tmp;
    __asm volatile("rdtsc" : "=A" (tmp));
return tmp;
}


float GetCPUSpeed()
{
    LARGE_INTEGER liFreq, liTicks, liValue;
    UINT64        iTimestamp;
    float         fSpeed;    
    HANDLE        hThread;
    int           iPriority;
    
    hThread  = GetCurrentThread();
    iPriority = GetThreadPriority(hThread);
 
    QueryPerformanceFrequency(&liFreq);
 
    QueryPerformanceCounter(&liTicks);
    liValue.QuadPart = liTicks.QuadPart + liFreq.QuadPart;

    SetThreadPriority(hThread, THREAD_PRIORITY_HIGHEST);

    iTimestamp = rdtsc();

    do 
    {
      QueryPerformanceCounter(&liTicks);
    } while (liTicks.QuadPart <= liValue.QuadPart);

    fSpeed = (float)(int)(rdtsc() - iTimestamp)/ 1000000;
    SetThreadPriority(hThread, iPriority);

    return fSpeed;
}


int main()
{
  cout<<GetCPUSpeed()<<" MHz";
  cin.get();
return 0; 
}