计算计数器值
大多数计数器类型使用公式来计算计数器的可显示值。 有关计数器类型及其公式的列表，请参阅 Windows Server 2003 部署工具包的计数器类型部分。 如果计数器需要两个样本才能计算可显示值，则设置计数器类型的 PERF_DELTA_COUNTER 标志。
以下示例演示如何使用原始数据计算每种计数器类型的可显示值。 此示例基于 检索计数器数据中的示例。
// Contains the elements required to calculate a counter value.
typedef struct
{
DWORD CounterType;
DWORD MultiCounterData; // Second raw counter value for multi-valued counters
ULONGLONG Data; // Raw counter data
LONGLONG Time; // Is a time value or a base value
LONGLONG Frequency;
} RAW_DATA;
// Use the CounterType to determine how to calculate the displayable
// value. The case statement includes the formula used to calculate
// the value.
BOOL DisplayCalculatedValue(RAW_DATA* pSample0, RAW_DATA* pSample1)
{
BOOL fSuccess = TRUE;
ULONGLONG numerator = 0;
LONGLONG denominator = 0;
double doubleValue = 0;
DWORD dwordValue = 0;
if (NULL == pSample1)
{
// Return error if the counter type requires two samples to calculate the value.
switch (pSample0->CounterType)
{
default:
if (PERF_DELTA_COUNTER != (pSample0->CounterType & PERF_DELTA_COUNTER))
{
break;
}
__fallthrough;
case PERF_AVERAGE_TIMER: // Special case.
case PERF_AVERAGE_BULK: // Special case.
wprintf(L"The counter type requires two samples but only one sample was provided.\n");
fSuccess = FALSE;
goto cleanup;
}
}
else
{
if (pSample0->CounterType != pSample1->CounterType)
{
wprintf(L"The samples have inconsistent counter types.\n");
fSuccess = FALSE;
goto cleanup;
}
// Check for integer overflow or bad data from provider (the data from
// sample 2 must be greater than the data from sample 1).
if (pSample0->Data > pSample1->Data)
{
// Can happen for various reasons. Commonly occurs with the Process counterset when
// multiple processes have the same name and one of them starts or stops.
// Normally you'll just drop the older sample and continue.
wprintf(L"Sample0 (%llu) is larger than sample1 (%llu).\n", pSample0->Data, pSample1->Data);
fSuccess = FALSE;
goto cleanup;
}
}
switch (pSample0->CounterType)
{
case PERF_COUNTER_COUNTER:
case PERF_SAMPLE_COUNTER:
case PERF_COUNTER_BULK_COUNT:
// (N1 - N0) / ((D1 - D0) / F)
numerator = pSample1->Data - pSample0->Data;
denominator = pSample1->Time - pSample0->Time;
dwordValue = (DWORD)(numerator / ((double)denominator / pSample1->Frequency));
wprintf(L"Display value is: %lu%ls\n", dwordValue,
(pSample0->CounterType == PERF_SAMPLE_COUNTER) ? L"" : L"/sec");
break;
case PERF_COUNTER_QUEUELEN_TYPE:
case PERF_COUNTER_100NS_QUEUELEN_TYPE:
case PERF_COUNTER_OBJ_TIME_QUEUELEN_TYPE:
case PERF_COUNTER_LARGE_QUEUELEN_TYPE:
case PERF_AVERAGE_BULK: // normally not displayed
// (N1 - N0) / (D1 - D0)
numerator = pSample1->Data - pSample0->Data;
denominator = pSample1->Time - pSample0->Time;
doubleValue = (double)numerator / denominator;
if (pSample0->CounterType != PERF_AVERAGE_BULK)
wprintf(L"Display value is: %f\n", doubleValue);
break;
case PERF_OBJ_TIME_TIMER:
case PERF_COUNTER_TIMER:
case PERF_100NSEC_TIMER:
case PERF_PRECISION_SYSTEM_TIMER:
case PERF_PRECISION_100NS_TIMER:
case PERF_PRECISION_OBJECT_TIMER:
case PERF_SAMPLE_FRACTION:
// 100 * (N1 - N0) / (D1 - D0)
numerator = pSample1->Data - pSample0->Data;
denominator = pSample1->Time - pSample0->Time;
doubleValue = (double)(100 * numerator) / denominator;
wprintf(L"Display value is: %f%%\n", doubleValue);
break;
case PERF_COUNTER_TIMER_INV:
// 100 * (1 - ((N1 - N0) / (D1 - D0)))
numerator = pSample1->Data - pSample0->Data;
denominator = pSample1->Time - pSample0->Time;
doubleValue = 100 * (1 - ((double)numerator / denominator));
wprintf(L"Display value is: %f%%\n", doubleValue);
break;
case PERF_100NSEC_TIMER_INV:
// 100 * (1- (N1 - N0) / (D1 - D0))
numerator = pSample1->Data - pSample0->Data;
denominator = pSample1->Time - pSample0->Time;
doubleValue = 100 * (1 - (double)numerator / denominator);
wprintf(L"Display value is: %f%%\n", doubleValue);
break;
case PERF_COUNTER_MULTI_TIMER:
// 100 * ((N1 - N0) / ((D1 - D0) / TB)) / B1
numerator = pSample1->Data - pSample0->Data;
denominator = pSample1->Time - pSample0->Time;
denominator /= pSample1->Frequency;
doubleValue = 100 * ((double)numerator / denominator) / pSample1->MultiCounterData;
wprintf(L"Display value is: %f%%\n", doubleValue);
break;
case PERF_100NSEC_MULTI_TIMER:
// 100 * ((N1 - N0) / (D1 - D0)) / B1
numerator = pSample1->Data - pSample0->Data;
denominator = pSample1->Time - pSample0->Time;
doubleValue = 100 * ((double)numerator / denominator) / pSample1->MultiCounterData;
wprintf(L"Display value is: %f%%\n", doubleValue);
break;
case PERF_COUNTER_MULTI_TIMER_INV:
case PERF_100NSEC_MULTI_TIMER_INV:
// 100 * (B1 - ((N1 - N0) / (D1 - D0)))
numerator = pSample1->Data - pSample0->Data;
denominator = pSample1->Time - pSample0->Time;
doubleValue = 100 * (pSample1->MultiCounterData - ((double)numerator / denominator));
wprintf(L"Display value is: %f%%\n", doubleValue);
break;
case PERF_COUNTER_RAWCOUNT:
case PERF_COUNTER_LARGE_RAWCOUNT:
// N as decimal
wprintf(L"Display value is: %llu\n", pSample0->Data);
break;
case PERF_COUNTER_RAWCOUNT_HEX:
case PERF_COUNTER_LARGE_RAWCOUNT_HEX:
// N as hexadecimal
wprintf(L"Display value is: 0x%llx\n", pSample0->Data);
break;
case PERF_COUNTER_DELTA:
case PERF_COUNTER_LARGE_DELTA:
// N1 - N0
wprintf(L"Display value is: %llu\n", pSample1->Data - pSample0->Data);
break;
case PERF_RAW_FRACTION:
case PERF_LARGE_RAW_FRACTION:
// 100 * N / B
doubleValue = (double)100 * pSample0->Data / pSample0->Time;
wprintf(L"Display value is: %f%%\n", doubleValue);
break;
case PERF_AVERAGE_TIMER:
// ((N1 - N0) / TB) / (B1 - B0)
numerator = pSample1->Data - pSample0->Data;
denominator = pSample1->Time - pSample0->Time;
doubleValue = (double)numerator / pSample1->Frequency / denominator;
wprintf(L"Display value is: %f seconds\n", doubleValue);
break;
case PERF_ELAPSED_TIME:
// (D0 - N0) / F
doubleValue = (double)(pSample0->Time - pSample0->Data) / pSample0->Frequency;
wprintf(L"Display value is: %f seconds\n", doubleValue);
break;
case PERF_COUNTER_TEXT:
case PERF_SAMPLE_BASE:
case PERF_AVERAGE_BASE:
case PERF_COUNTER_MULTI_BASE:
case PERF_RAW_BASE:
case PERF_COUNTER_NODATA:
case PERF_PRECISION_TIMESTAMP:
wprintf(L"Non-printing counter type.\n");
break;
default:
wprintf(L"Unrecognized counter type.\n");
fSuccess = FALSE;
break;
}
cleanup:
return fSuccess;
}
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