请问：如何获得CPU的利用率？（高分求助！）

[seasun2k]

[masterz]

http://www.csdn.net/expert/Topic/284/284153.shtm

[masterz]

http://www.csdn.net/expert/Topic/184/184198.shtm

[Jneu]

在注册表里~

[zzh]

在Windows2000系统内幕这本书中有介绍

[mzm100]

98还是2000？

[seasun2k]

\\Processor(_Total)\\% Processor Time 时候为:99.999315859528这种结果.
而为:\\Processor(_Total)\\% User Time 时候为:6.4791656793412e-005这种结果,
这个结果如何转化为CPU占有率5%,10%这样的参数??

[zj_ok]

pdh函数

[HWLee]

win95或win98环境下：
HKEY key;
DWORD dwIndex = 0;
long lError;
unsigned long nValue;
char strCPUInfo[10] = {0};
TCHAR szPrinter[100];
DWORD dwSize = 100, nSize = sizeof(long);


if(RegOpenKeyEx(HKEY_DYN_DATA, _T("PerfStats\\StatData"), 0, KEY_ALL_ACCESS, &key) != ERROR_SUCCESS)
return -1;
do
{
if((lError = RegEnumValue(key, dwIndex++, szPrinter, &dwSize, NULL, &nValue, NULL, &nSize)) != ERROR_SUCCESS)
{
RegCloseKey(key);
return -1;
}
dwSize = 100;
}while(strcmp(szPrinter, "KERNEL\\CPUUsage"));

sprintf(strCPUInfo,"%5.2f",(float)nValue);

[HWLee]

winNT、win2000下：

#define CNTR_CPU "\\Processor(_Total)\\% Processor Time" // % of cpu in use

//函数类型定义(will load from pdh.dll)
typedef PDH_STATUS(FAR PASCAL *PPDHCLOSEQUERY)(HQUERY);
typedef PDH_STATUS(FAR PASCAL *PPDHOPENQUERY)(LPCTSTR, DWORD , HQUERY *);
typedef PDH_STATUS(FAR PASCAL *PPDHADDCOUNTER)(HQUERY, LPCTSTR, DWORD, HCOUNTER *);
typedef PDH_STATUS(FAR PASCAL *PPDHCOLLECTQUERYDATA)(HQUERY);
typedef PDH_STATUS(FAR PASCAL *PPDHGETFORMATTEDCOUNTERVALUE)(
HCOUNTER hCounter,
DWORD dwFormat,
LPDWORD lpdwType,
PPDH_FMT_COUNTERVALUE pValue
);

//函数指针定义
PPDHCLOSEQUERY pPdhCloseQuery;
PPDHOPENQUERY pPdhOpenQuery;
PPDHADDCOUNTER pPdhAddCounter;
PPDHCOLLECTQUERYDATA pPdhCollectQueryData;
PPDHGETFORMATTEDCOUNTERVALUE pPdhGetFormattedCounterValue;

//Load PDH.dll
int LoadPDHDll(void)
{
//Load library
int nRet = 0;
HMODULE hDll = LoadLibrary("pdh.dll");
if(!hDll)
{
ShowLastErrMsg();
return -1;
}

pPdhCloseQuery = (PPDHCLOSEQUERY)GetProcAddress(hDll, "PdhCloseQuery");
if(!pPdhCloseQuery)
{
ShowLastErrMsg();
return -1;
}
pPdhOpenQuery = (PPDHOPENQUERY)GetProcAddress(hDll, "PdhOpenQueryA");
if(!pPdhOpenQuery)
{
ShowLastErrMsg();
return -1;
}
pPdhAddCounter = (PPDHADDCOUNTER)GetProcAddress(hDll, "PdhAddCounterA");
if(!pPdhAddCounter)
{
ShowLastErrMsg();
return -1;
}
pPdhCollectQueryData = (PPDHCOLLECTQUERYDATA)GetProcAddress(hDll, "PdhCollectQueryData");
if(!pPdhCollectQueryData)
{
ShowLastErrMsg();
return -1;
}
pPdhGetFormattedCounterValue = (PPDHGETFORMATTEDCOUNTERVALUE)GetProcAddress(hDll, "PdhGetFormattedCounterValue");
if(!pPdhGetFormattedCounterValue)
{
ShowLastErrMsg();
return -1;
}

return 0;
}
//以下是Get cpu 利用率的代码示例，支持多cpu。取得的是多个cpu利用率的平均值

char strCPUInfo[10] = {0};
DWORD dwFormat = PDH_FMT_LONG;
PDH_FMT_COUNTERVALUE *lpItemBuffer;

if(!bInitedFlag)
{
bInitedFlag = TRUE;
if (pPdhOpenQuery(NULL,1,&hPDHQuery) != ERROR_SUCCESS)
return -1;


// add to current query
if (pPdhAddCounter(hPDHQuery,CNTR_CPU,0,&hPDHCounter) != ERROR_SUCCESS)
{
return -1;
}
}

// Allocate the counter value structure.
lpItemBuffer = (PDH_FMT_COUNTERVALUE *) GlobalAlloc
(GPTR, sizeof(PDH_FMT_COUNTERVALUE));

if (pPdhCollectQueryData(hPDHQuery) != ERROR_SUCCESS)
{
return -1;
}
// get the value from the PDH
if (pPdhGetFormattedCounterValue(hPDHCounter,
dwFormat,(LPDWORD)NULL, lpItemBuffer) != ERROR_SUCCESS)
{
return -1;
}
// test the value for validity
if (lpItemBuffer->CStatus != ERROR_SUCCESS)
{
return -1;
}

// set value
sprintf(strCPUInfo,"%5.2f",(float)lpItemBuffer->longValue + 1);

[seasun2k]

为什么我使用
PdhGetFormattedCounterValue(pCounter->hCounter, PDH_FMT_LONG, NULL, &pdhFormattedValue)，调用完成后，得到的CPU占用率为99，而Sleep以后，再调用，得到的还是99呢？

[mzm100]

>>为什么我使用
>>PdhGetFormattedCounterValue(pCounter->hCounter, PDH_FMT_LONG, NULL, >>&pdhFormattedValue)，调用完成后，得到的CPU占用率为99，而Sleep以后，再调用，得>>到的还是99呢？
你得到的是系统的CPU使用率，要得到某一进程的CPU使用率，要在PDHAddCounter指明为哪一进程，如：
pdhStatus = PdhAddCounter (hQCputime,
TEXT("\\Process(StreamSrv)\\% Processor Time"),
0,
&hCounter1);

[seasun2k]

同志们，我还是取不到像性能监视器那样的值，大家帮帮忙！我急用...
我要得到的是整个CPU的利用率。不是某个进程的利用率。我要得到的也不是某个时间点的CPU利用率，想得到的是某段时间的平均值。我的目的是将CPU的利用率作为负载平衡调度的度量单位。

[MSVCer]

gzz

[seasun2k]

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