如何在System.Diagnostics.Stopwatch中使用AverageTimer32和AverageBase性能计数器？

Question

当我执行以下程序并查看性能计数器时,结果对我来说没有意义.平均值为零,当我期望~0.1或~100时,最小/最大值为~0.4.

我的问题是什么？

码

class Program
{
    const string CategoryName = "____Test Category";
    const string CounterName = "Average Operation Time";
    const string BaseCounterName = "Average Operation Time Base";

    static void Main(string[] args)
    {
        if (PerformanceCounterCategory.Exists(CategoryName))
            PerformanceCounterCategory.Delete(CategoryName);

        var counterDataCollection = new CounterCreationDataCollection();

        var avgOpTimeCounter = new CounterCreationData()
        {
            CounterName = CounterName,
            CounterHelp = "Average Operation Time Help",
            CounterType = PerformanceCounterType.AverageTimer32
        };
        counterDataCollection.Add(avgOpTimeCounter);

        var avgOpTimeBaseCounter = new CounterCreationData()
        {
            CounterName = BaseCounterName,
            CounterHelp = "Average Operation Time Base Help",
            CounterType = PerformanceCounterType.AverageBase
        };
        counterDataCollection.Add(avgOpTimeBaseCounter);

        PerformanceCounterCategory.Create(CategoryName, "Test Perf Counters", PerformanceCounterCategoryType.SingleInstance, counterDataCollection);

        var counter = new PerformanceCounter(CategoryName, CounterName, false);
        var baseCounter = new PerformanceCounter(CategoryName, BaseCounterName, false);

        for (int i = 0; i < 500; i++)
        {
            var sw = Stopwatch.StartNew();
            Thread.Sleep(100);
            sw.Stop();

            Console.WriteLine(string.Format("t({0}) ms({1})", sw.Elapsed.Ticks, sw.Elapsed.TotalMilliseconds));
            counter.IncrementBy(sw.Elapsed.Ticks);
            baseCounter.Increment();
        }

        Console.Read();
    }
}

性能计数器屏幕截图 性能计数器屏幕截图http://friendfeed-media.com/50028bb6a0016931a3af5122774b56f93741bb5c

Answer 1

System.Diagnostics API包含一个非常微妙的混乱源:System.Diagnostics'ticks'与DateTime或TimeSpan'ticks'不同!

如果你使用StopWatch.ElapsedTicks而不是StopWatch.Elapsed.Ticks,它应该工作.

该文档包含有关此内容的更多信息.

Answer 2

Mark Seemann解释了问题的混乱来源,但我想提供一些额外的信息.

如果您想AverageTimer32从a TimeSpan而不是a 设置性能计数器,则Stopwatch可以执行以下转换:

var performanceCounterTicks = timeSpan.Ticks*Stopwatch.Frequency/TimeSpan.TicksPerSecond;
averageTimerCounter.IncrementBy(performanceCounterTicks);
averageTimerCounterBase.Increment();