CounterSample.SystemFrequency Property
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Gets the raw system frequency.
public:
property long SystemFrequency { long get(); };public long SystemFrequency { get; }member this.SystemFrequency : int64Public ReadOnly Property SystemFrequency As LongProperty Value
The frequency with which the system reads from the counter.
Examples
The following example displays the value of the SystemFrequency property for a counter.
#using <System.dll>
using namespace System;
using namespace System::Collections;
using namespace System::Collections::Specialized;
using namespace System::Diagnostics;
// Output information about the counter sample.
void OutputSample( CounterSample s )
{
Console::WriteLine( "\r\n+++++++++++" );
Console::WriteLine( "Sample values - \r\n" );
Console::WriteLine( " BaseValue = {0}", s.BaseValue );
Console::WriteLine( " CounterFrequency = {0}", s.CounterFrequency );
Console::WriteLine( " CounterTimeStamp = {0}", s.CounterTimeStamp );
Console::WriteLine( " CounterType = {0}", s.CounterType );
Console::WriteLine( " RawValue = {0}", s.RawValue );
Console::WriteLine( " SystemFrequency = {0}", s.SystemFrequency );
Console::WriteLine( " TimeStamp = {0}", s.TimeStamp );
Console::WriteLine( " TimeStamp100nSec = {0}", s.TimeStamp100nSec );
Console::WriteLine( "++++++++++++++++++++++" );
}
//++++++++//++++++++//++++++++//++++++++//++++++++//++++++++//++++++++//++++++++
// Description - This counter type shows how many items are processed, on average,
// during an operation. Counters of this type display a ratio of the items
// processed (such as bytes sent) to the number of operations completed. The
// ratio is calculated by comparing the number of items processed during the
// last interval to the number of operations completed during the last interval.
// Generic type - Average
// Formula - (N1 - N0) / (D1 - D0), where the numerator (N) represents the number
// of items processed during the last sample interval and the denominator (D)
// represents the number of operations completed during the last two sample
// intervals.
// Average (Nx - N0) / (Dx - D0)
// Example PhysicalDisk\ Avg. Disk Bytes/Transfer
//++++++++//++++++++//++++++++//++++++++//++++++++//++++++++//++++++++//++++++++
float MyComputeCounterValue( CounterSample s0, CounterSample s1 )
{
float numerator = (float)s1.RawValue - (float)s0.RawValue;
float denomenator = (float)s1.BaseValue - (float)s0.BaseValue;
float counterValue = numerator / denomenator;
return counterValue;
}
bool SetupCategory()
{
if ( !PerformanceCounterCategory::Exists( "AverageCounter64SampleCategory" ) )
{
CounterCreationDataCollection^ CCDC = gcnew CounterCreationDataCollection;
// Add the counter.
CounterCreationData^ averageCount64 = gcnew CounterCreationData;
averageCount64->CounterType = PerformanceCounterType::AverageCount64;
averageCount64->CounterName = "AverageCounter64Sample";
CCDC->Add( averageCount64 );
// Add the base counter.
CounterCreationData^ averageCount64Base = gcnew CounterCreationData;
averageCount64Base->CounterType = PerformanceCounterType::AverageBase;
averageCount64Base->CounterName = "AverageCounter64SampleBase";
CCDC->Add( averageCount64Base );
// Create the category.
PerformanceCounterCategory::Create( "AverageCounter64SampleCategory", "Demonstrates usage of the AverageCounter64 performance counter type.", CCDC );
return (true);
}
else
{
Console::WriteLine( "Category exists - AverageCounter64SampleCategory" );
return (false);
}
}
void CreateCounters( PerformanceCounter^% PC, PerformanceCounter^% BPC )
{
// Create the counters.
PC = gcnew PerformanceCounter( "AverageCounter64SampleCategory","AverageCounter64Sample",false );
BPC = gcnew PerformanceCounter( "AverageCounter64SampleCategory","AverageCounter64SampleBase",false );
PC->RawValue = 0;
BPC->RawValue = 0;
}
void CollectSamples( ArrayList^ samplesList, PerformanceCounter^ PC, PerformanceCounter^ BPC )
{
Random^ r = gcnew Random( DateTime::Now.Millisecond );
// Loop for the samples.
for ( int j = 0; j < 100; j++ )
{
int value = r->Next( 1, 10 );
Console::Write( "{0} = {1}", j, value );
PC->IncrementBy( value );
BPC->Increment();
if ( (j % 10) == 9 )
{
OutputSample( PC->NextSample() );
samplesList->Add( PC->NextSample() );
}
else
Console::WriteLine();
System::Threading::Thread::Sleep( 50 );
}
}
void CalculateResults( ArrayList^ samplesList )
{
for ( int i = 0; i < (samplesList->Count - 1); i++ )
{
// Output the sample.
OutputSample( *safe_cast<CounterSample^>(samplesList[ i ]) );
OutputSample( *safe_cast<CounterSample^>(samplesList[ i + 1 ]) );
// Use .NET to calculate the counter value.
Console::WriteLine( ".NET computed counter value = {0}", CounterSampleCalculator::ComputeCounterValue( *safe_cast<CounterSample^>(samplesList[ i ]), *safe_cast<CounterSample^>(samplesList[ i + 1 ]) ) );
// Calculate the counter value manually.
Console::WriteLine( "My computed counter value = {0}", MyComputeCounterValue( *safe_cast<CounterSample^>(samplesList[ i ]), *safe_cast<CounterSample^>(samplesList[ i + 1 ]) ) );
}
}
int main()
{
ArrayList^ samplesList = gcnew ArrayList;
PerformanceCounter^ PC;
PerformanceCounter^ BPC;
SetupCategory();
CreateCounters( PC, BPC );
CollectSamples( samplesList, PC, BPC );
CalculateResults( samplesList );
}
using System;
using System.Collections;
using System.Collections.Specialized;
using System.Diagnostics;
public class App
{
private static PerformanceCounter avgCounter64Sample;
private static PerformanceCounter avgCounter64SampleBase;
public static void Main()
{
ArrayList samplesList = new ArrayList();
// If the category does not exist, create the category and exit.
// Performance counters should not be created and immediately used.
// There is a latency time to enable the counters, they should be created
// prior to executing the application that uses the counters.
// Execute this sample a second time to use the category.
if (SetupCategory())
return;
CreateCounters();
CollectSamples(samplesList);
CalculateResults(samplesList);
}
private static bool SetupCategory()
{
if ( !PerformanceCounterCategory.Exists("AverageCounter64SampleCategory") )
{
CounterCreationDataCollection counterDataCollection = new CounterCreationDataCollection();
// Add the counter.
CounterCreationData averageCount64 = new CounterCreationData();
averageCount64.CounterType = PerformanceCounterType.AverageCount64;
averageCount64.CounterName = "AverageCounter64Sample";
counterDataCollection.Add(averageCount64);
// Add the base counter.
CounterCreationData averageCount64Base = new CounterCreationData();
averageCount64Base.CounterType = PerformanceCounterType.AverageBase;
averageCount64Base.CounterName = "AverageCounter64SampleBase";
counterDataCollection.Add(averageCount64Base);
// Create the category.
PerformanceCounterCategory.Create("AverageCounter64SampleCategory",
"Demonstrates usage of the AverageCounter64 performance counter type.",
PerformanceCounterCategoryType.SingleInstance, counterDataCollection);
return(true);
}
else
{
Console.WriteLine("Category exists - AverageCounter64SampleCategory");
return(false);
}
}
private static void CreateCounters()
{
// Create the counters.
avgCounter64Sample = new PerformanceCounter("AverageCounter64SampleCategory",
"AverageCounter64Sample",
false);
avgCounter64SampleBase = new PerformanceCounter("AverageCounter64SampleCategory",
"AverageCounter64SampleBase",
false);
avgCounter64Sample.RawValue=0;
avgCounter64SampleBase.RawValue=0;
}
private static void CollectSamples(ArrayList samplesList)
{
Random r = new Random( DateTime.Now.Millisecond );
// Loop for the samples.
for (int j = 0; j < 100; j++)
{
int value = r.Next(1, 10);
Console.Write(j + " = " + value);
avgCounter64Sample.IncrementBy(value);
avgCounter64SampleBase.Increment();
if ((j % 10) == 9)
{
OutputSample(avgCounter64Sample.NextSample());
samplesList.Add( avgCounter64Sample.NextSample() );
}
else
{
Console.WriteLine();
}
System.Threading.Thread.Sleep(50);
}
}
private static void CalculateResults(ArrayList samplesList)
{
for(int i = 0; i < (samplesList.Count - 1); i++)
{
// Output the sample.
OutputSample( (CounterSample)samplesList[i] );
OutputSample( (CounterSample)samplesList[i+1] );
// Use .NET to calculate the counter value.
Console.WriteLine(".NET computed counter value = " +
CounterSampleCalculator.ComputeCounterValue((CounterSample)samplesList[i],
(CounterSample)samplesList[i+1]) );
// Calculate the counter value manually.
Console.WriteLine("My computed counter value = " +
MyComputeCounterValue((CounterSample)samplesList[i],
(CounterSample)samplesList[i+1]) );
}
}
//++++++++//++++++++//++++++++//++++++++//++++++++//++++++++//++++++++//++++++++
// Description - This counter type shows how many items are processed, on average,
// during an operation. Counters of this type display a ratio of the items
// processed (such as bytes sent) to the number of operations completed. The
// ratio is calculated by comparing the number of items processed during the
// last interval to the number of operations completed during the last interval.
// Generic type - Average
// Formula - (N1 - N0) / (D1 - D0), where the numerator (N) represents the number
// of items processed during the last sample interval and the denominator (D)
// represents the number of operations completed during the last two sample
// intervals.
// Average (Nx - N0) / (Dx - D0)
// Example PhysicalDisk\ Avg. Disk Bytes/Transfer
//++++++++//++++++++//++++++++//++++++++//++++++++//++++++++//++++++++//++++++++
private static Single MyComputeCounterValue(CounterSample s0, CounterSample s1)
{
Single numerator = (Single)s1.RawValue - (Single)s0.RawValue;
Single denomenator = (Single)s1.BaseValue - (Single)s0.BaseValue;
Single counterValue = numerator / denomenator;
return(counterValue);
}
// Output information about the counter sample.
private static void OutputSample(CounterSample s)
{
Console.WriteLine("\r\n+++++++++++");
Console.WriteLine("Sample values - \r\n");
Console.WriteLine(" BaseValue = " + s.BaseValue);
Console.WriteLine(" CounterFrequency = " + s.CounterFrequency);
Console.WriteLine(" CounterTimeStamp = " + s.CounterTimeStamp);
Console.WriteLine(" CounterType = " + s.CounterType);
Console.WriteLine(" RawValue = " + s.RawValue);
Console.WriteLine(" SystemFrequency = " + s.SystemFrequency);
Console.WriteLine(" TimeStamp = " + s.TimeStamp);
Console.WriteLine(" TimeStamp100nSec = " + s.TimeStamp100nSec);
Console.WriteLine("++++++++++++++++++++++");
}
}
Imports System.Collections
Imports System.Collections.Specialized
Imports System.Diagnostics
_
Public Class App
Private Shared avgCounter64Sample As PerformanceCounter
Private Shared avgCounter64SampleBase As PerformanceCounter
Public Shared Sub Main()
Dim samplesList As New ArrayList()
'If the category does not exist, create the category and exit.
'Performance counters should not be created and immediately used.
'There is a latency time to enable the counters, they should be created
'prior to executing the application that uses the counters.
'Execute this sample a second time to use the counters.
If Not (SetupCategory()) Then
CreateCounters()
CollectSamples(samplesList)
CalculateResults(samplesList)
End If
End Sub
Private Shared Function SetupCategory() As Boolean
If Not PerformanceCounterCategory.Exists("AverageCounter64SampleCategory") Then
Dim counterDataCollection As New CounterCreationDataCollection()
' Add the counter.
Dim averageCount64 As New CounterCreationData()
averageCount64.CounterType = PerformanceCounterType.AverageCount64
averageCount64.CounterName = "AverageCounter64Sample"
counterDataCollection.Add(averageCount64)
' Add the base counter.
Dim averageCount64Base As New CounterCreationData()
averageCount64Base.CounterType = PerformanceCounterType.AverageBase
averageCount64Base.CounterName = "AverageCounter64SampleBase"
counterDataCollection.Add(averageCount64Base)
' Create the category.
PerformanceCounterCategory.Create("AverageCounter64SampleCategory", _
"Demonstrates usage of the AverageCounter64 performance counter type.", _
PerformanceCounterCategoryType.SingleInstance, counterDataCollection)
Return True
Else
Console.WriteLine("Category exists - AverageCounter64SampleCategory")
Return False
End If
End Function 'SetupCategory
Private Shared Sub CreateCounters()
' Create the counters.
avgCounter64Sample = New PerformanceCounter("AverageCounter64SampleCategory", "AverageCounter64Sample", False)
avgCounter64SampleBase = New PerformanceCounter("AverageCounter64SampleCategory", "AverageCounter64SampleBase", False)
avgCounter64Sample.RawValue = 0
avgCounter64SampleBase.RawValue = 0
End Sub
Private Shared Sub CollectSamples(ByVal samplesList As ArrayList)
Dim r As New Random(DateTime.Now.Millisecond)
' Loop for the samples.
Dim j As Integer
For j = 0 To 99
Dim value As Integer = r.Next(1, 10)
Console.Write(j.ToString() + " = " + value.ToString())
avgCounter64Sample.IncrementBy(value)
avgCounter64SampleBase.Increment()
If j Mod 10 = 9 Then
OutputSample(avgCounter64Sample.NextSample())
samplesList.Add(avgCounter64Sample.NextSample())
Else
Console.WriteLine()
End If
System.Threading.Thread.Sleep(50)
Next j
End Sub
Private Shared Sub CalculateResults(ByVal samplesList As ArrayList)
Dim i As Integer
For i = 0 To (samplesList.Count - 1) - 1
' Output the sample.
OutputSample(CType(samplesList(i), CounterSample))
OutputSample(CType(samplesList((i + 1)), CounterSample))
' Use .NET to calculate the counter value.
Console.WriteLine(".NET computed counter value = " + CounterSampleCalculator.ComputeCounterValue(CType(samplesList(i), CounterSample), CType(samplesList((i + 1)), CounterSample)).ToString())
' Calculate the counter value manually.
Console.WriteLine("My computed counter value = " + MyComputeCounterValue(CType(samplesList(i), CounterSample), CType(samplesList((i + 1)), CounterSample)).ToString())
Next i
End Sub
'++++++++//++++++++//++++++++//++++++++//++++++++//++++++++//++++++++//++++++++
' Description - This counter type shows how many items are processed, on average,
' during an operation. Counters of this type display a ratio of the items
' processed (such as bytes sent) to the number of operations completed. The
' ratio is calculated by comparing the number of items processed during the
' last interval to the number of operations completed during the last interval.
' Generic type - Average
' Formula - (N1 - N0) / (D1 - D0), where the numerator (N) represents the number
' of items processed during the last sample interval and the denominator (D)
' represents the number of operations completed during the last two sample
' intervals.
' Average (Nx - N0) / (Dx - D0)
' Example PhysicalDisk\ Avg. Disk Bytes/Transfer
'++++++++//++++++++//++++++++//++++++++//++++++++//++++++++//++++++++//++++++++
Private Shared Function MyComputeCounterValue(ByVal s0 As CounterSample, ByVal s1 As CounterSample) As [Single]
Dim numerator As [Single] = CType(s1.RawValue, [Single]) - CType(s0.RawValue, [Single])
Dim denomenator As [Single] = CType(s1.BaseValue, [Single]) - CType(s0.BaseValue, [Single])
Dim counterValue As [Single] = numerator / denomenator
Return counterValue
End Function 'MyComputeCounterValue
' Output information about the counter sample.
Private Shared Sub OutputSample(ByVal s As CounterSample)
Console.WriteLine(ControlChars.Lf + ControlChars.Cr + "+++++++++++")
Console.WriteLine("Sample values - " + ControlChars.Lf + ControlChars.Cr)
Console.WriteLine((" BaseValue = " + s.BaseValue.ToString()))
Console.WriteLine((" CounterFrequency = " + s.CounterFrequency.ToString()))
Console.WriteLine((" CounterTimeStamp = " + s.CounterTimeStamp.ToString()))
Console.WriteLine((" CounterType = " + s.CounterType.ToString()))
Console.WriteLine((" RawValue = " + s.RawValue.ToString()))
Console.WriteLine((" SystemFrequency = " + s.SystemFrequency.ToString()))
Console.WriteLine((" TimeStamp = " + s.TimeStamp.ToString()))
Console.WriteLine((" TimeStamp100nSec = " + s.TimeStamp100nSec.ToString()))
Console.WriteLine("++++++++++++++++++++++")
End Sub
End Class
Applies to
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