Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Services / Monitoring / system / Diagnosticts / CounterSampleCalculator.cs / 1305376 / 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 FileIOPermission(PermissionState.Unrestricted).Assert(); string installPath = System.Runtime.InteropServices.RuntimeEnvironment.GetRuntimeDirectory(); string perfcounterPath = Path.Combine(installPath, "perfcounter.dll"); if (SafeNativeMethods.LoadLibrary(perfcounterPath) == IntPtr.Zero) { throw new Win32Exception( Marshal.GetLastWin32Error() ); } perfCounterDllLoaded = true; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ //// 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 FileIOPermission(PermissionState.Unrestricted).Assert(); string installPath = System.Runtime.InteropServices.RuntimeEnvironment.GetRuntimeDirectory(); string perfcounterPath = Path.Combine(installPath, "perfcounter.dll"); if (SafeNativeMethods.LoadLibrary(perfcounterPath) == IntPtr.Zero) { throw new Win32Exception( Marshal.GetLastWin32Error() ); } perfCounterDllLoaded = true; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- ObjectItemNoOpAssemblyLoader.cs
- TabOrder.cs
- MarkerProperties.cs
- EntitySqlException.cs
- GridViewRowEventArgs.cs
- ObjectReferenceStack.cs
- Synchronization.cs
- BinaryEditor.cs
- ErrorRuntimeConfig.cs
- QualifiedId.cs
- IdentitySection.cs
- EntityContainerEntitySet.cs
- ConnectionInterfaceCollection.cs
- BuilderPropertyEntry.cs
- IisTraceWebEventProvider.cs
- SelectionListDesigner.cs
- FormViewRow.cs
- UInt16Converter.cs
- Soap.cs
- OleDbStruct.cs
- ClientBuildManagerCallback.cs
- TextTreeDeleteContentUndoUnit.cs
- ConstructorNeedsTagAttribute.cs
- BufferedMessageData.cs
- InkCanvasSelectionAdorner.cs
- WebHttpBindingCollectionElement.cs
- TraceEventCache.cs
- EllipticalNodeOperations.cs
- DrawingBrush.cs
- SRGSCompiler.cs
- AnnotationComponentChooser.cs
- HttpCacheVary.cs
- PageThemeBuildProvider.cs
- BehaviorEditorPart.cs
- FtpRequestCacheValidator.cs
- FixedFindEngine.cs
- GenericWebPart.cs
- StateBag.cs
- WebPartConnectionsDisconnectVerb.cs
- CodeDefaultValueExpression.cs
- InputMethodStateTypeInfo.cs
- LayoutEditorPart.cs
- ActiveXSite.cs
- UnsafeNetInfoNativeMethods.cs
- EndPoint.cs
- SizeLimitedCache.cs
- ScrollChrome.cs
- Convert.cs
- GeometryValueSerializer.cs
- SecurityDescriptor.cs
- DataBoundControlAdapter.cs
- ChannelFactoryRefCache.cs
- OleDbStruct.cs
- Oci.cs
- DynamicDocumentPaginator.cs
- RawStylusActions.cs
- FrameworkElementFactory.cs
- Crc32Helper.cs
- DataBindingHandlerAttribute.cs
- EdmItemCollection.cs
- XsdDateTime.cs
- GC.cs
- AmbiguousMatchException.cs
- PreviousTrackingServiceAttribute.cs
- TextSimpleMarkerProperties.cs
- Solver.cs
- OwnerDrawPropertyBag.cs
- QueryRewriter.cs
- ResizeGrip.cs
- ListSortDescriptionCollection.cs
- DeclarativeCatalogPartDesigner.cs
- InputLanguageEventArgs.cs
- ThicknessKeyFrameCollection.cs
- TemplateBuilder.cs
- XPathAxisIterator.cs
- FormsAuthenticationUserCollection.cs
- PagesChangedEventArgs.cs
- TagPrefixAttribute.cs
- ConnectionPointGlyph.cs
- AttributeProviderAttribute.cs
- LayoutTableCell.cs
- AnimationClockResource.cs
- UnsafeNativeMethods.cs
- IntSumAggregationOperator.cs
- MemberCollection.cs
- BlurEffect.cs
- relpropertyhelper.cs
- SchemaImporterExtensionsSection.cs
- TextEditorThreadLocalStore.cs
- InvalidOleVariantTypeException.cs
- ConnectionProviderAttribute.cs
- UdpAnnouncementEndpoint.cs
- AxWrapperGen.cs
- Parameter.cs
- WeakReferenceKey.cs
- TextParagraphCache.cs
- TransformerInfo.cs
- ListControl.cs
- PropertyPathConverter.cs
- OleDbCommand.cs