DWORD CSystemCounters::GetServerSessions()
{
CPerfCounters<LONGLONG> PerfCounters;
DWORD dwObjectIndex = SERVER_OBJECT_INDEX;
DWORD dwServerSessionsCounter = SERVER_SESSIONS_OBJECT_INDEX;
PPERF_DATA_BLOCK pPerfData = NULL;
PPERF_OBJECT_TYPE pPerfObj = NULL;
LONGLONG x = PerfCounters.GetCounterValue(&pPerfData, &pPerfObj, dwObjectIndex, dwServerSessionsCounter, NULL);
return (DWORD)x;
}
int CCpuUsage::GetCpuUsage(LPCTSTR pProcessName)
{
if (m_bFirstTime)
EnablePerformaceCounters();
// Cpu usage counter is 8 byte length.
CPerfCounters PerfCounters;
char szInstance[256] = {0};
DWORD dwObjectIndex = PROCESS_OBJECT_INDEX;
DWORD dwCpuUsageIndex = PROCESSOR_TIME_COUNTER_INDEX;
strcpy_s(szInstance,256,pProcessName);
int CpuUsage = 0;
LONGLONG lnNewValue = 0;
PPERF_DATA_BLOCK pPerfData = NULL;
LARGE_INTEGER NewPerfTime100nSec = {0};
lnNewValue = PerfCounters.GetCounterValue(&pPerfData, dwObjectIndex, dwCpuUsageIndex, szInstance);
NewPerfTime100nSec = pPerfData->PerfTime100nSec;
if (m_bFirstTime)
{
m_bFirstTime = false;
m_lnOldValue = lnNewValue;
m_OldPerfTime100nSec = NewPerfTime100nSec;
return 0;
}
LONGLONG lnValueDelta = lnNewValue - m_lnOldValue;
double DeltaPerfTime100nSec = (double)NewPerfTime100nSec.QuadPart - (double)m_OldPerfTime100nSec.QuadPart;
m_lnOldValue = lnNewValue;
m_OldPerfTime100nSec = NewPerfTime100nSec;
double a = (double)lnValueDelta / DeltaPerfTime100nSec;
CpuUsage = (int) (a*100);
if (CpuUsage < 0)
return 0;
return CpuUsage;
}
///////////////////////////////////////////////////////////////////
//
// GetSystemUpTime uses the performance counters to retrieve the
// system up time.
// The system up time counter is of type PERF_ELAPSED_TIME
// which as the following calculation:
//
// Element Value
// ======= ===========
// X CounterData
// Y PerfTime
// Data Size 8 Bytes
// Time base PerfFreq
// Calculation (Y-X)/TB
//
///////////////////////////////////////////////////////////////////
DWORD CSystemCounters::GetSystemUpTime()
{
CPerfCounters<LONGLONG> PerfCounters;
DWORD dwObjectIndex = SYSTEM_OBJECT_INDEX;
DWORD dwSystemUpTimeCounter = SYSTEM_UPTIME_COUNTER_INDEX;
PPERF_DATA_BLOCK pPerfData = NULL;
PPERF_OBJECT_TYPE pPerfObj = NULL;
LONGLONG x = PerfCounters.GetCounterValue(&pPerfData, &pPerfObj, dwObjectIndex, dwSystemUpTimeCounter, NULL);
LONGLONG y = pPerfObj->PerfTime.QuadPart;
LONGLONG tb = pPerfObj->PerfFreq.QuadPart;
if (tb == 0)
return 0;
DWORD UpTime = (DWORD)((y-x) / tb);
if (UpTime < 0)
return 0;
return UpTime;
}
//
// GetCpuUsage returns the system-wide cpu usage.
// Since we calculate the cpu usage by two samplings, the first
// call to GetCpuUsage() returns 0 and keeps the values for the next
// sampling.
// Read the comment at the beginning of this file for the formula.
//
int CCpuUsage::GetCpuUsage()
{
if (m_bFirstTime)
EnablePerformaceCounters();
// Cpu usage counter is 8 byte length.
CPerfCounters PerfCounters;
char szInstance[256] = {0};
// Note:
// ====
// On windows NT, cpu usage counter is '% Total processor time'
// under 'System' object. However, in Win2K/XP Microsoft moved
// that counter to '% processor time' under '_Total' instance
// of 'Processor' object.
// Read 'INFO: Percent Total Performance Counter Changes on Windows 2000'
// Q259390 in MSDN.
DWORD dwObjectIndex;
DWORD dwCpuUsageIndex;
switch (m_nPlatform)
{
case WINNT:
dwObjectIndex = SYSTEM_OBJECT_INDEX;
dwCpuUsageIndex = TOTAL_PROCESSOR_TIME_COUNTER_INDEX;
break;
case WIN2K_XP:
dwObjectIndex = PROCESSOR_OBJECT_INDEX;
dwCpuUsageIndex = PROCESSOR_TIME_COUNTER_INDEX;
strcpy_s(szInstance,256,"_Total");
break;
default:
return -1;
}
int CpuUsage = 0;
LONGLONG lnNewValue = 0;
PPERF_DATA_BLOCK pPerfData = NULL;
LARGE_INTEGER NewPerfTime100nSec = {0};
lnNewValue = PerfCounters.GetCounterValue(&pPerfData, dwObjectIndex, dwCpuUsageIndex, szInstance);
NewPerfTime100nSec = pPerfData->PerfTime100nSec;
if (m_bFirstTime)
{
m_bFirstTime = false;
m_lnOldValue = lnNewValue;
m_OldPerfTime100nSec = NewPerfTime100nSec;
return 0;
}
LONGLONG lnValueDelta = lnNewValue - m_lnOldValue;
double DeltaPerfTime100nSec = (double)NewPerfTime100nSec.QuadPart - (double)m_OldPerfTime100nSec.QuadPart;
m_lnOldValue = lnNewValue;
m_OldPerfTime100nSec = NewPerfTime100nSec;
double a = (double)lnValueDelta / DeltaPerfTime100nSec;
double f = (1.0 - a) * 100.0;
CpuUsage = (int)(f ); // rounding the result
if (CpuUsage < 0)
return 0;
return CpuUsage;
}
//
// GetCpuUsage returns the system-wide cpu usage.
// Since we calculate the cpu usage by two samplings, the first
// call to GetCpuUsage() returns 0 and keeps the values for the next
// sampling.
// Read the comment at the beginning of this file for the formula.
//
double CCpuUsage::GetCpuUsage()
{
static PLATFORM Platform = GetPlatform();
if (m_bFirstTime)
EnablePerformaceCounters();
// Cpu usage counter is 8 byte length.
CPerfCounters<LONGLONG> PerfCounters;
wstring szInstance;
// Note:
// ====
// On windows NT, cpu usage counter is '% Total processor time'
// under 'System' object. However, in Win2K/XP Microsoft moved
// that counter to '% processor time' under '_Total' instance
// of 'Processor' object.
// Read 'INFO: Percent Total Performance Counter Changes on Windows 2000'
// Q259390 in MSDN.
DWORD dwObjectIndex;
DWORD dwCpuUsageIndex;
switch (Platform)
{
case WINNT:
dwObjectIndex = SYSTEM_OBJECT_INDEX;
dwCpuUsageIndex = TOTAL_PROCESSOR_TIME_COUNTER_INDEX;
break;
case WIN2K_XP:
dwObjectIndex = PROCESSOR_OBJECT_INDEX;
dwCpuUsageIndex = PROCESSOR_TIME_COUNTER_INDEX;
if (m_proc == TOTAL_CPU_USAGE_PROC)
szInstance = L"_Total";
else {
std::wostringstream oss;
oss << m_proc;
szInstance = oss.str();
}
break;
default:
return -1;
}
double CpuUsage = 0;
LONGLONG lnNewValue = 0;
PPERF_DATA_BLOCK pPerfData = NULL;
LARGE_INTEGER NewPerfTime100nSec = {0};
lnNewValue = PerfCounters.GetCounterValue(&pPerfData, dwObjectIndex, dwCpuUsageIndex, (const LPWSTR)szInstance.c_str());
NewPerfTime100nSec = pPerfData->PerfTime100nSec;
if (m_bFirstTime)
{
m_bFirstTime = false;
m_lnOldValue = lnNewValue;
m_OldPerfTime100nSec = NewPerfTime100nSec;
return 0;
}
LONGLONG lnValueDelta = lnNewValue - m_lnOldValue;
double DeltaPerfTime100nSec = (double)NewPerfTime100nSec.QuadPart - (double)m_OldPerfTime100nSec.QuadPart;
m_lnOldValue = lnNewValue;
m_OldPerfTime100nSec = NewPerfTime100nSec;
if (DeltaPerfTime100nSec == 0)
return 0;
double a = (double)lnValueDelta / DeltaPerfTime100nSec;
double f = (1.0 - a) * 100.0;
CpuUsage = (double)(f + 0.5); // rounding the result
if (CpuUsage < 0)
return 0;
return CpuUsage;
}