对老赵写的简单性能计数器的修改

来源：互联网发布：淘宝封店了怎么办编辑：程序博客网时间：2024/05/16 19:03

对老赵写的简单性能计数器的修改

早上看到老赵写的这个性能计数器，感觉很实用，不过老赵用了很多.C# 3.0 的新语法，还用了 VISTA 和 Server2008 下特有的Win32 API，对于还在用C#2.0 或者还工作在 XP 或者 Server 2003下的兄弟们，只能望代码心叹了。应老赵的要求，我修改了他的代码，增加了对低版本C# 和低版本windows 操作系统的支持。

老赵的原文：一个简单的性能计数器：CodeTimer

修改说明

1. 采用接口取代了原代码中的 Lambda 表达式

2. 采用 GetThreadTimes 这个API 函数替代了原代码中的 QueryThreadCycleTime

这里需要说明的是 GetThreadTimes 给出了线程在内核态和用户态占用的时间，单位是 100ns。两个时间的总和就是线程占用的CPU时间。这个API的时间精度我看了一些资料似乎没有达到 100ns. 所以GetThreadTimes这个API函数的进度没有 QueryThreadCycleTime 高。

下面是我修改后的代码

注释1: 2009-03-11 增加委托的调用，修改 GC.Collect 参数，兼容.Net 2.0. 增加每次调用时间统计

增加了委托调用后，我发现同样是测试空函数，采用接口比采用委托效率要略高一些，这和我的预计基本吻合，因为委托不是单纯的函数调用，具体原理超出本文范围，我就不多说了。

using System;

using System.Collections.Generic;

using System.Text;

using System.Diagnostics;

using System.Threading;

using System.Runtime.InteropServices;

public interface IAction

{

void Action();

}

public static class CodeTimer

{

[DllImport("kernel32.dll", SetLastError = true)]

static extern bool GetThreadTimes(IntPtr hThread, out long lpCreationTime,

out long lpExitTime, out long lpKernelTime, out long lpUserTime);

[DllImport("kernel32.dll")]

static extern IntPtr GetCurrentThread();

public delegate void ActionDelegate();

private static long GetCurrentThreadTimes()

{

long l;

long kernelTime, userTimer;

GetThreadTimes(GetCurrentThread(), out l, out l, out kernelTime,

out userTimer);

return kernelTime + userTimer;

}

static CodeTimer()

{

Process.GetCurrentProcess().PriorityClass = ProcessPriorityClass.High;

Thread.CurrentThread.Priority = ThreadPriority.Highest;

}

public static void Time(string name, int iteration, ActionDelegate action)

{

if (String.IsNullOrEmpty(name))

{

return;

}

if (action == null)

{

return;

}

//1. Print name

ConsoleColor currentForeColor = Console.ForegroundColor;

Console.ForegroundColor = ConsoleColor.Yellow;

Console.WriteLine(name);

// 2. Record the latest GC counts

//GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced);

GC.Collect(GC.MaxGeneration);

int[] gcCounts = new int[GC.MaxGeneration + 1];

for (int i = 0; i <= GC.MaxGeneration; i++)

{

gcCounts[i] = GC.CollectionCount(i);

}

// 3. Run action

Stopwatch watch = new Stopwatch();

watch.Start();

long ticksFst = GetCurrentThreadTimes(); //100 nanosecond one tick

for (int i = 0; i < iteration; i++) action();

long ticks = GetCurrentThreadTimes() - ticksFst;

watch.Stop();

// 4. Print CPU

Console.ForegroundColor = currentForeColor;

Console.WriteLine("/tTime Elapsed:/t/t" +

watch.ElapsedMilliseconds.ToString("N0") + "ms");

Console.WriteLine("/tTime Elapsed (one time):" +

(watch.ElapsedMilliseconds / iteration).ToString("N0") + "ms");

Console.WriteLine("/tCPU time:/t/t" + (ticks * 100).ToString("N0")

+ "ns");

Console.WriteLine("/tCPU time (one time):/t" + (ticks * 100 /

iteration).ToString("N0") + "ns");

// 5. Print GC

for (int i = 0; i <= GC.MaxGeneration; i++)

{

int count = GC.CollectionCount(i) - gcCounts[i];

Console.WriteLine("/tGen " + i + ": /t/t/t" + count);

}

Console.WriteLine();

}

public static void Time(string name, int iteration, IAction action)

{

if (String.IsNullOrEmpty(name))

{

return;

}

if (action == null)

{

return;

}

//1. Print name

ConsoleColor currentForeColor = Console.ForegroundColor;

Console.ForegroundColor = ConsoleColor.Yellow;

Console.WriteLine(name);

// 2. Record the latest GC counts

//GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced);

GC.Collect(GC.MaxGeneration);

int[] gcCounts = new int[GC.MaxGeneration + 1];

for (int i = 0; i <= GC.MaxGeneration; i++)

{

gcCounts[i] = GC.CollectionCount(i);

}

// 3. Run action

Stopwatch watch = new Stopwatch();

watch.Start();

long ticksFst = GetCurrentThreadTimes(); //100 nanosecond one tick

for (int i = 0; i < iteration; i++) action.Action();

long ticks = GetCurrentThreadTimes() - ticksFst;

watch.Stop();

// 4. Print CPU

Console.ForegroundColor = currentForeColor;

Console.WriteLine("/tTime Elapsed:/t/t" +

watch.ElapsedMilliseconds.ToString("N0") + "ms");

Console.WriteLine("/tTime Elapsed (one time):" +

(watch.ElapsedMilliseconds / iteration).ToString("N0") + "ms");

Console.WriteLine("/tCPU time:/t/t" + (ticks * 100).ToString("N0")

+ "ns");

Console.WriteLine("/tCPU time (one time):/t" + (ticks * 100 /

iteration).ToString("N0") + "ns");

// 5. Print GC

for (int i = 0; i <= GC.MaxGeneration; i++)

{

int count = GC.CollectionCount(i) - gcCounts[i];

Console.WriteLine("/tGen " + i + ": /t/t/t" + count);

}

Console.WriteLine();

}

测试类

    public class TestSleep3000 : IAction
    {
        #region IAction Members

        public void Action()
        {
            Thread.Sleep(3000);
        }

        #endregion
    }

    public class TestEmptyMethod : IAction
    {
        #region IAction Members

        public void Action()
        {
        }

        #endregion
    }

    public class TestStringConcat : IAction
    {
        string s = "";

        #region IAction Members

        public void Action()
        {
            s += "a";
        }

        #endregion
    }

    public class TestStringBuilderConcat : IAction
    {
        StringBuilder s = new StringBuilder();

        #region IAction Members

        public void Action()
        {
            s.Append ("a");
        }

        #endregion
    }

测试代码

采用接口

            CodeTimer.Time("Thread Sleep", 1, new TestSleep3000());
            CodeTimer.Time("Thread Sleep", 10000000, new TestEmptyMethod());
            CodeTimer.Time("String Concat", 100000, new TestStringConcat());
            CodeTimer.Time("StringBuilder Conca", 100000,
                 new TestStringBuilderConcat());

测试结果

Thread Sleep
        Time Elapsed:           2,997ms
        Time Elapsed (one time):2,997ms
        CPU time:               0ns
        CPU time (one time):    0ns
        Gen 0:                  0
        Gen 1:                  0
        Gen 2:                  0

Empty Method
        Time Elapsed:           138ms
        Time Elapsed (one time):0ms
        CPU time:               125,000,000ns
        CPU time (one time):    12ns
        Gen 0:                  0
        Gen 1:                  0
        Gen 2:                  0

String Concat
        Time Elapsed:           10,547ms
        Time Elapsed (one time):0ms
        CPU time:               10,546,875,000ns
        CPU time (one time):    105,468ns
        Gen 0:                  4102
        Gen 1:                  2661
        Gen 2:                  2545

StringBuilder Conca
        Time Elapsed:           4ms
        Time Elapsed (one time):0ms
        CPU time:               0ns
        CPU time (one time):    0ns
        Gen 0:                  0
        Gen 1:                  0
        Gen 2:                  0

采用委托

CodeTimer.Time("Thread Sleep", 1, delegate() { Thread.Sleep(3000); });

CodeTimer.Time("Empty Method", 10000000, delegate() { });

string a = "";

CodeTimer.Time("String Concat", 100000, delegate() { a += "a"; });

StringBuilder s = new StringBuilder();

CodeTimer.Time("StringBuilder Conca", 100000, delegate() { s.Append("a"); });

测试结果

Thread Sleep
        Time Elapsed:           2,989ms
        Time Elapsed (one time):2,989ms
        CPU time:               0ns
        CPU time (one time):    0ns
        Gen 0:                  0
        Gen 1:                  0
        Gen 2:                  0

Empty Method
        Time Elapsed:           156ms
        Time Elapsed (one time):0ms
        CPU time:               156,250,000ns
        CPU time (one time):    15ns
        Gen 0:                  0
        Gen 1:                  0
        Gen 2:                  0

String Concat
        Time Elapsed:           10,425ms
        Time Elapsed (one time):0ms
        CPU time:               10,406,250,000ns
        CPU time (one time):    104,062ns
        Gen 0:                  4102
        Gen 1:                  2661
        Gen 2:                  2545