CounterSample Estrutura

Definição

Namespace:

System.Diagnostics

Assembly:

System.Diagnostics.PerformanceCounter.dll

Pacote:

System.Diagnostics.PerformanceCounter v8.0.0

Origem:

CounterSample.cs

Define uma estrutura que contém os dados brutos de um contador de desempenho.

C#

public readonly struct CounterSample : IEquatable<System.Diagnostics.CounterSample>

Herança

Object

ValueType

CounterSample

Implementações

IEquatable<CounterSample>

Exemplos

O exemplo a seguir demonstra o uso da CounterSample classe para exibir dados de um contador de desempenho.

C#

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("++++++++++++++++++++++");
    }
}

Construtores

CounterSample(Int64, Int64, Int64, Int64, Int64, Int64, PerformanceCounterType)	Inicializa uma nova instância da estrutura CounterSample e define a propriedade CounterTimeStamp como 0 (zero).
CounterSample(Int64, Int64, Int64, Int64, Int64, Int64, PerformanceCounterType, Int64)	Inicializa uma nova instância da estrutura CounterSample e define a propriedade CounterTimeStamp como o valor que é passado.

Campos

Empty

Define uma amostra do contador de desempenho vazio e não inicializado do tipo NumberOfItems32.

Propriedades

BaseValue	Obtém um valor bruto opcional base para o contador.
CounterFrequency	Obtém a frequência do contador bruta.
CounterTimeStamp	Obtém o carimbo de data/hora do contador.
CounterType	Obtém o tipo de contador de desempenho.
RawValue	Obtém o valor bruto do contador.
SystemFrequency	Obtém a frequência do sistema bruta.
TimeStamp	Obtém o carimbo de data/hora bruto.
TimeStamp100nSec	Obtém o carimbo de data/hora bruto de alta fidelidade.

Métodos

Calculate(CounterSample)	Calcula os dados de desempenho do contador, usando um único ponto de amostra. Esse método é geralmente usado para tipos de contador de desempenho não calculados.
Calculate(CounterSample, CounterSample)	Calcula os dados de desempenho do contador, usando dois pontos de amostra. Esse método é geralmente usado para tipos de contador de desempenho calculados, como médias.
Equals(CounterSample)	Indica se a estrutura CounterSample especificada é igual à estrutura CounterSample atual.
Equals(Object)	Indica se a estrutura especificada é uma estrutura CounterSample e é idêntica à estrutura CounterSample atual.
GetHashCode()	Obtém um código hash para a amostra do contador atual.

Operadores

Equality(CounterSample, CounterSample)	Retorna um valor que indica se duas estruturas CounterSample são iguais.
Inequality(CounterSample, CounterSample)	Retorna um valor que indica se duas estruturas CounterSample não são iguais.

Aplica-se a