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标题: GetSystemTimes来获取CPU的使用率和task manager结... [打印本页]

作者: Michaelmisy 时间: 2019-3-4 22:01
标题: GetSystemTimes来获取CPU的使用率和task manager结...
我用windows的API GetSystemTimes来获取CPU的使用率，但是得到的结果和task manager的结果差距很大，请问有大佬知道怎么获得和task manager CPU使用率差不多的值的方式么？下面是计算方式
__int64 CompareFileTime(FILETIME time1, FILETIME time2)
{
//__int64 a = time1.dwHighDateTime << 32 | time1.dwLowDateTime;
//__int64 b = time2.dwHighDateTime << 32 | time2.dwLowDateTime;
//std::cout << "time 1 is "<<&time1 << "time 2 is " << &time2 << std::endl;
//return (b - a);
UINT64 i641 = (UINT64)time1.dwHighDateTime*(0xFFFFFFFFui64 + 1ui64) + (UINT64)time1.dwLowDateTime;
UINT64 i642 = (UINT64)time2.dwHighDateTime*(0xFFFFFFFFui64 + 1ui64) + (UINT64)time2.dwLowDateTime;
return i642 - i641;
}
void getSystemTimesExample() {
GetSystemTimes(&lastIdleTime, &lastKernelTime, &lastUserTime);
while (true) {
Sleep(1000);
GetSystemTimes(&currentIdleTime, &currentKernelTime, &currentUserTime);
int idle = CompareFileTime(lastIdleTime, currentIdleTime);
int kernel = CompareFileTime(lastKernelTime, currentKernelTime);
int user = CompareFileTime(lastUserTime, currentUserTime);
int sum = kernel + user;
double cpuUsage = (sum- idle)*100.0 / sum;
std::cout << "sum is " << sum << "cpu is " << cpuUsage << " idle time is " << idle <<std::endl;
lastIdleTime = currentIdleTime;
lastKernelTime = currentKernelTime;
lastUserTime = currentUserTime;
}
}
int main()
{
getSystemTimesExample();

std::cout << "Hello World!\n";
}

作者: ArchieCari 时间: 2019-3-4 22:02
为什么会不一样，不应该啊

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