Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Services / Monitoring / system / Diagnosticts / CounterSampleCalculator.cs / 2 / CounterSampleCalculator.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Diagnostics { using System.Threading; using System; using System.ComponentModel; using Microsoft.Win32; using System.Text; using System.IO; using System.Runtime.InteropServices; using System.Security.Permissions; using System.Globalization; using System.Runtime.Versioning; ////// Set of utility functions for interpreting the counter data /// NOTE: most of this code was taken and ported from counters.c (PerfMon source code) /// public static class CounterSampleCalculator { static bool perfCounterDllLoaded = false; ////// Converts 100NS elapsed time to fractional seconds /// ///private static float GetElapsedTime(CounterSample oldSample, CounterSample newSample) { float eSeconds; float eDifference; if (newSample.RawValue == 0) { // no data [start time = 0] so return 0 return 0.0f; } else { float eFreq; eFreq = (float)(ulong)oldSample.CounterFrequency; if (oldSample.UnsignedRawValue >= (ulong)newSample.CounterTimeStamp || eFreq <= 0.0f) return 0.0f; // otherwise compute difference between current time and start time eDifference = (float)((ulong)newSample.CounterTimeStamp - oldSample.UnsignedRawValue); // convert to fractional seconds using object counter eSeconds = eDifference / eFreq; return eSeconds; } } /// /// Computes the calculated value given a raw counter sample. /// public static float ComputeCounterValue(CounterSample newSample) { return ComputeCounterValue(CounterSample.Empty, newSample); } ////// Computes the calculated value given a raw counter sample. /// public static float ComputeCounterValue(CounterSample oldSample, CounterSample newSample) { int newCounterType = (int) newSample.CounterType; if (oldSample.SystemFrequency == 0) { if ((newCounterType != NativeMethods.PERF_RAW_FRACTION) && (newCounterType != NativeMethods.PERF_COUNTER_RAWCOUNT) && (newCounterType != NativeMethods.PERF_COUNTER_RAWCOUNT_HEX) && (newCounterType != NativeMethods.PERF_COUNTER_LARGE_RAWCOUNT) && (newCounterType != NativeMethods.PERF_COUNTER_LARGE_RAWCOUNT_HEX) && (newCounterType != NativeMethods.PERF_COUNTER_MULTI_BASE)) { // Since oldSample has a system frequency of 0, this means the newSample is the first sample // on a two sample calculation. Since we can't do anything with it, return 0. return 0.0f; } } else if (oldSample.CounterType != newSample.CounterType) { throw new InvalidOperationException(SR.GetString(SR.MismatchedCounterTypes)); } if (newCounterType == NativeMethods.PERF_ELAPSED_TIME) return (float)GetElapsedTime(oldSample, newSample); NativeMethods.PDH_RAW_COUNTER newPdhValue = new NativeMethods.PDH_RAW_COUNTER(); NativeMethods.PDH_RAW_COUNTER oldPdhValue = new NativeMethods.PDH_RAW_COUNTER(); FillInValues(oldSample, newSample, oldPdhValue, newPdhValue); LoadPerfCounterDll(); NativeMethods.PDH_FMT_COUNTERVALUE pdhFormattedValue= new NativeMethods.PDH_FMT_COUNTERVALUE(); long timeBase = newSample.SystemFrequency; int result = SafeNativeMethods.FormatFromRawValue((uint) newCounterType, NativeMethods.PDH_FMT_DOUBLE | NativeMethods.PDH_FMT_NOSCALE | NativeMethods.PDH_FMT_NOCAP100, ref timeBase, newPdhValue, oldPdhValue, pdhFormattedValue); if (result != NativeMethods.ERROR_SUCCESS) { // If the numbers go negative, just return 0. This better matches the old behavior. if (result == NativeMethods.PDH_CALC_NEGATIVE_VALUE || result == NativeMethods.PDH_CALC_NEGATIVE_DENOMINATOR || result == NativeMethods.PDH_NO_DATA) return 0; else throw new Win32Exception(result, SR.GetString(SR.PerfCounterPdhError, result.ToString("x", CultureInfo.InvariantCulture))); } return (float) pdhFormattedValue.data; } // This method figures out which values are supposed to go into which structures so that PDH can do the // calculation for us. This was ported from Window's cutils.c private static void FillInValues(CounterSample oldSample, CounterSample newSample, NativeMethods.PDH_RAW_COUNTER oldPdhValue, NativeMethods.PDH_RAW_COUNTER newPdhValue) { int newCounterType = (int) newSample.CounterType; switch (newCounterType) { case NativeMethods.PERF_COUNTER_COUNTER: case NativeMethods.PERF_COUNTER_QUEUELEN_TYPE: case NativeMethods.PERF_SAMPLE_COUNTER: case NativeMethods.PERF_OBJ_TIME_TIMER: case NativeMethods.PERF_COUNTER_OBJ_TIME_QUEUELEN_TYPE: newPdhValue.FirstValue = newSample.RawValue; newPdhValue.SecondValue = newSample.TimeStamp; oldPdhValue.FirstValue = oldSample.RawValue; oldPdhValue.SecondValue = oldSample.TimeStamp; break; case NativeMethods.PERF_COUNTER_100NS_QUEUELEN_TYPE: newPdhValue.FirstValue = newSample.RawValue; newPdhValue.SecondValue = newSample.TimeStamp100nSec; oldPdhValue.FirstValue = oldSample.RawValue; oldPdhValue.SecondValue = oldSample.TimeStamp100nSec; break; case NativeMethods.PERF_COUNTER_TIMER: case NativeMethods.PERF_COUNTER_TIMER_INV: case NativeMethods.PERF_COUNTER_BULK_COUNT: case NativeMethods.PERF_COUNTER_LARGE_QUEUELEN_TYPE: case NativeMethods.PERF_COUNTER_MULTI_TIMER: case NativeMethods.PERF_COUNTER_MULTI_TIMER_INV: newPdhValue.FirstValue = newSample.RawValue; newPdhValue.SecondValue = newSample.TimeStamp; oldPdhValue.FirstValue = oldSample.RawValue; oldPdhValue.SecondValue = oldSample.TimeStamp; if (newCounterType == NativeMethods.PERF_COUNTER_MULTI_TIMER || newCounterType == NativeMethods.PERF_COUNTER_MULTI_TIMER_INV) { // this is to make PDH work like PERFMON for // this counter type newPdhValue.FirstValue *= (uint) newSample.CounterFrequency; if (oldSample.CounterFrequency != 0) { oldPdhValue.FirstValue *= (uint) oldSample.CounterFrequency; } } if ((newCounterType & NativeMethods.PERF_MULTI_COUNTER) == NativeMethods.PERF_MULTI_COUNTER) { newPdhValue.MultiCount = (int) newSample.BaseValue; oldPdhValue.MultiCount = (int) oldSample.BaseValue; } break; // // These counters do not use any time reference // case NativeMethods.PERF_COUNTER_RAWCOUNT: case NativeMethods.PERF_COUNTER_RAWCOUNT_HEX: case NativeMethods.PERF_COUNTER_DELTA: case NativeMethods.PERF_COUNTER_LARGE_RAWCOUNT: case NativeMethods.PERF_COUNTER_LARGE_RAWCOUNT_HEX: case NativeMethods.PERF_COUNTER_LARGE_DELTA: newPdhValue.FirstValue = newSample.RawValue; newPdhValue.SecondValue = 0; oldPdhValue.FirstValue = oldSample.RawValue; oldPdhValue.SecondValue = 0; break; // // These counters use the 100 Ns time base in thier calculation // case NativeMethods.PERF_100NSEC_TIMER: case NativeMethods.PERF_100NSEC_TIMER_INV: case NativeMethods.PERF_100NSEC_MULTI_TIMER: case NativeMethods.PERF_100NSEC_MULTI_TIMER_INV: newPdhValue.FirstValue = newSample.RawValue; newPdhValue.SecondValue = newSample.TimeStamp100nSec; oldPdhValue.FirstValue = oldSample.RawValue; oldPdhValue.SecondValue = oldSample.TimeStamp100nSec; if ((newCounterType & NativeMethods.PERF_MULTI_COUNTER) == NativeMethods.PERF_MULTI_COUNTER) { newPdhValue.MultiCount = (int) newSample.BaseValue; oldPdhValue.MultiCount = (int) oldSample.BaseValue; } break; // // These counters use two data points // case NativeMethods.PERF_SAMPLE_FRACTION: case NativeMethods.PERF_RAW_FRACTION: case NativeMethods.PERF_LARGE_RAW_FRACTION: case NativeMethods.PERF_PRECISION_SYSTEM_TIMER: case NativeMethods.PERF_PRECISION_100NS_TIMER: case NativeMethods.PERF_PRECISION_OBJECT_TIMER: case NativeMethods.PERF_AVERAGE_TIMER: case NativeMethods.PERF_AVERAGE_BULK: newPdhValue.FirstValue = newSample.RawValue; newPdhValue.SecondValue = newSample.BaseValue; oldPdhValue.FirstValue = oldSample.RawValue; oldPdhValue.SecondValue = oldSample.BaseValue; break; default: // an unidentified counter was returned so newPdhValue.FirstValue = 0; newPdhValue.SecondValue = 0; oldPdhValue.FirstValue = 0; oldPdhValue.SecondValue = 0; break; } } [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] private static void LoadPerfCounterDll() { if (perfCounterDllLoaded) return; new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Assert(); // load perfcounter.dll manually, since it usually isn't on the path. IntPtr mscorwksHandle = NativeMethods.GetModuleHandle("mscorwks.dll"); if (mscorwksHandle == IntPtr.Zero) throw new Win32Exception(); int size = 132; StringBuilder filename; HandleRef mscorwksHandleRef = new HandleRef(null, mscorwksHandle); do { size *= 2; filename = new StringBuilder(size); size = UnsafeNativeMethods.GetModuleFileName(mscorwksHandleRef, filename, size); if (size == 0) throw new Win32Exception(); } while (size == filename.Capacity); string installPath = Path.GetDirectoryName( filename.ToString() ); string perfcounterPath = Path.Combine(installPath, "perfcounter.dll"); if (SafeNativeMethods.LoadLibrary(perfcounterPath) == IntPtr.Zero) throw new Win32Exception(); perfCounterDllLoaded = true; } } }
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