wince 计算CPU的使用率 GetIdleTim…

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本文介绍了一种在Wince平台上计算CPU使用率的方法，通过编写应用程序定期获取系统空闲时间并计算平均CPU负载。文章详细展示了如何利用GetIdleTime函数及其实现原理。

wince 计算CPU的使用率 GetIdleTime

OEMIdle( DWORD dwIdleParam )

This function is called by the kernel to place the CPU in the idle state when there are no threads ready to run.

The number of milliseconds that the system has been idle. If GetIdleTime returns MAXDWORD, this functionality is

not supported by your platform.

GetIdleTime(void)

This function returns the amount of time, in milliseconds, that the system has been idle.

在OEMIdle()函数中OEM根据(int) (dwRescheduleTime – CurMSec) 计算值判断是否让CPU进入idle状态，因此我们可以利用此函数来计算cpu的loading. 根据MSDN ,可以写个应用程序，每100ms去计算一次idle的时间，10次评价后，在UI上更新，以下是应用程序的一个线程！

static void CallCountCpuIdleThread(CCountCpuDlg *pCCountCpuDlg)
{
DWORD dwStartTick;
DWORD dwIdleStart;
DWORD dwStopTick;
DWORD dwIdleEnd;
int   nPresentIdle;
int   nCpuUage[10]={0};
int   nCount=0;
int   ave=0;
DWORD sum=0;
int i;

while(1)
{
  dwStartTick=GetTickCount();
  dwIdleStart=GetIdleTime();
  Sleep(100);
  dwStopTick=GetTickCount();
  dwIdleEnd=GetIdleTime();

  nPresentIdle=(100*(dwIdleEnd-dwIdleStart))/((dwStopTick-dwStartTick));

  if(nCount<10)
  {
   nCpuUage[nCount]=nPresentIdle;
   nCount++;
   if(nCount==10)
   {
    for(i=0;i<10;i++)
     sum+=nCpuUage[i];
    ave=sum/10;
    // g_nCpuIdle only read in the main thread
    g_nCpuIdle=ave;
    nCount=0;
    sum=0;
    //RETAILMSG(1,(TEXT("CPU laoding is %d /r/n"),ave));
    }
  }
}
}