线程上下文切换的性能损耗测试

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线程上下文切换的性能损耗测试

发表于：2014-6-18 11:42

字体：大中小 | 上一篇 | 下一篇 | 我要投稿

作者：Ethan Cai 来源：51Testing软件测试网采编

　　MultiThreadTester可以指定线程数，多个线程争抢计数。

1: class MultiThreadTester : ThreadTester

2: {

3: private Stopwatch _aStopWatch = new Stopwatch();

4: private readonly int _threadCount = 0;

5: private readonly object _counterLock = new object();

7: public MultiThreadTester(int threadCount)

8: {

9: this._threadCount = threadCount;

10: }

11:

12: public override void Start()

13: {

14: _aStopWatch.Start();

15:

16: for (int i = 0; i < _threadCount; i++)

17: {

18: Thread aThread = new Thread(() => WorkInThread());

19: aThread.Start();

20: }

21: }

22:

23: public override long GetElapsedMillisecondsOfIncreaseCounter()

24: {

25: return this._aStopWatch.ElapsedMilliseconds;

26: }

27:

28: public override bool IsTesterRunning()

29: {

30: return _aStopWatch.IsRunning;

31: }

32:

33: private void WorkInThread()

34: {

35: while (true)

36: {

37: lock (_counterLock)

38: {

39: if (this.GetCounter() > ThreadTester.MAX_COUNTER_NUMBER)

40: {

41: _aStopWatch.Stop();

42: break;

43: }

44:

45: this.IncreaseCounter();

46: }

47: }

48: }

49: }

　　Program的Main函数中，根据用户的选择来决定执行哪个测试类。

1: class Program

2: {

3: static void Main(string[] args)

4: {

6: string inputText = GetUserChoice();

8: while (!"4".Equals(inputText))

9: {

10: ThreadTester tester = GreateThreadTesterByInputText(inputText);

11: tester.Start();

12:

13: while (true)

14: {

15: Console.WriteLine(GetStatusOfThreadTester(tester));

16: if (!tester.IsTesterRunning())

17: {

18: break;

19: }

20: Thread.Sleep(100);

21: }

22:

23: inputText = GetUserChoice();

24: }

25:

26: Console.Write("Click enter to exit...");

27: }

28:

29: private static string GetStatusOfThreadTester(ThreadTester tester)

30: {

31: return string.Format("[耗时{0}ms] counter = {1}, {2}",

32: tester.GetElapsedMillisecondsOfIncreaseCounter(), tester.GetCounter(),

33: tester.IsTesterRunning() ? "running" : "stopped");

34: }

35:

36: private static ThreadTester GreateThreadTesterByInputText(string inputText)

37: {

38: switch (inputText)

39: {

40: case "1":

41: return new SingleThreadTester();

42: case "2":

43: return new TwoThreadSwitchTester();

44: default:

45: return new MultiThreadTester(100);

46: }

47: }

48:

49: private static string GetUserChoice()

50: {

51: Console.WriteLine(@"==Please select the option in the following list:==

52: 1. SingleThreadTester

53: 2. TwoThreadSwitchTester

54: 3. MultiThreadTester

55: 4. Exit");

56:

57: string inputText = Console.ReadLine();

58:

59: return inputText;

60: }

61: }

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