黑龙江住房和城乡建设局网站,焦作seo公司,网站正在建设中 源码下载,花生壳可做网站吗首先#xff0c;非常感谢赵老大的CodeTimer#xff0c;它让我们更好的了解到代码执行的性能#xff0c;从而可以让我们从性能的角度来考虑问题#xff0c;有些东西可能我们认为是这样的#xff0c;但经理测试并非如何#xff0c;这正应了我之前的那名话#xff1a;“机器…首先非常感谢赵老大的CodeTimer它让我们更好的了解到代码执行的性能从而可以让我们从性能的角度来考虑问题有些东西可能我们认为是这样的但经理测试并非如何这正应了我之前的那名话“机器最能证明一切” 费话就不说了看代码吧 1 /// summary2 /// 执行代码规范3 /// /summary4 public interface IAction5 {6 void Action();7 }8 9 /// summary10 /// 老赵的性能测试工具11 /// /summary12 public static class CodeTimer13 {14 [DllImport(kernel32.dll, SetLastError true)]15 static extern bool GetThreadTimes(IntPtr hThread, out long lpCreationTime, out long lpExitTime, out long lpKernelTime, out long lpUserTime);16 17 [DllImport(kernel32.dll)]18 static extern IntPtr GetCurrentThread();19 public delegate void ActionDelegate();20 private static long GetCurrentThreadTimes()21 {22 long l;23 long kernelTime, userTimer;24 GetThreadTimes(GetCurrentThread(), out l, out l, out kernelTime, out userTimer);25 return kernelTime userTimer;26 }27 static CodeTimer()28 {29 Process.GetCurrentProcess().PriorityClass ProcessPriorityClass.High;30 Thread.CurrentThread.Priority ThreadPriority.Highest;31 }32 public static void Time(string name, int iteration, ActionDelegate action)33 {34 if (String.IsNullOrEmpty(name))35 {36 return;37 }38 if (action null)39 {40 return;41 }42 43 //1. Print name44 ConsoleColor currentForeColor Console.ForegroundColor;45 Console.ForegroundColor ConsoleColor.Yellow;46 Console.WriteLine(name);47 48 // 2. Record the latest GC counts49 //GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced);50 GC.Collect(GC.MaxGeneration);51 int[] gcCounts new int[GC.MaxGeneration 1];52 for (int i 0; i GC.MaxGeneration; i)53 {54 gcCounts[i] GC.CollectionCount(i);55 }56 57 // 3. Run action58 Stopwatch watch new Stopwatch();59 watch.Start();60 long ticksFst GetCurrentThreadTimes(); //100 nanosecond one tick61 for (int i 0; i iteration; i) action();62 long ticks GetCurrentThreadTimes() - ticksFst;63 watch.Stop();64 65 // 4. Print CPU66 Console.ForegroundColor currentForeColor;67 Console.WriteLine(\tTime Elapsed:\t\t 68 watch.ElapsedMilliseconds.ToString(N0) ms);69 Console.WriteLine(\tTime Elapsed (one time): 70 (watch.ElapsedMilliseconds / iteration).ToString(N0) ms);71 Console.WriteLine(\tCPU time:\t\t (ticks * 100).ToString(N0)72 ns);73 Console.WriteLine(\tCPU time (one time):\t (ticks * 100 /74 iteration).ToString(N0) ns);75 76 // 5. Print GC77 for (int i 0; i GC.MaxGeneration; i)78 {79 int count GC.CollectionCount(i) - gcCounts[i];80 Console.WriteLine(\tGen i : \t\t\t count);81 }82 Console.WriteLine();83 }84 85 86 87 public static void Time(string name, int iteration, IAction action)88 {89 if (String.IsNullOrEmpty(name))90 {91 return;92 }93 94 if (action null)95 {96 return;97 }98 99 //1. Print name
100 ConsoleColor currentForeColor Console.ForegroundColor;
101 Console.ForegroundColor ConsoleColor.Yellow;
102 Console.WriteLine(name);
103
104 // 2. Record the latest GC counts
105 //GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced);
106 GC.Collect(GC.MaxGeneration);
107 int[] gcCounts new int[GC.MaxGeneration 1];
108 for (int i 0; i GC.MaxGeneration; i)
109 {
110 gcCounts[i] GC.CollectionCount(i);
111 }
112
113 // 3. Run action
114 Stopwatch watch new Stopwatch();
115 watch.Start();
116 long ticksFst GetCurrentThreadTimes(); //100 nanosecond one tick
117 for (int i 0; i iteration; i) action.Action();
118 long ticks GetCurrentThreadTimes() - ticksFst;
119 watch.Stop();
120
121 // 4. Print CPU
122 Console.ForegroundColor currentForeColor;
123 Console.WriteLine(\tTime Elapsed:\t\t
124 watch.ElapsedMilliseconds.ToString(N0) ms);
125 Console.WriteLine(\tTime Elapsed (one time):
126 (watch.ElapsedMilliseconds / iteration).ToString(N0) ms);
127 Console.WriteLine(\tCPU time:\t\t (ticks * 100).ToString(N0)
128 ns);
129 Console.WriteLine(\tCPU time (one time):\t (ticks * 100 /
130 iteration).ToString(N0) ns);
131
132 // 5. Print GC
133 for (int i 0; i GC.MaxGeneration; i)
134 {
135 int count GC.CollectionCount(i) - gcCounts[i];
136 Console.WriteLine(\tGen i : \t\t\t count);
137 }
138 Console.WriteLine();
139 }
140 } 有了上面的codeTimer我们就来测试一个吧如字条串和并的问题用还是用StringBuilder呢有点经验的程序员肯定说是StringBuilder是的确实是后者那我们就来看看这 两种方法测试的结果吧 1 CodeTimer.Time(String Concat, 100000,2 () 3 {4 var s 1;5 for (int i 1; i 10; i)6 s s 1;7 });8 9 CodeTimer.Time(StringBuilder Concat, 100000,
10 ()
11 {
12 var s new StringBuilder();
13 for (int i 1; i 10; i)
14 s.Append(1);
15 }); 测试的结果如下 从图中我们可以看到StringBuilder快的很明显无论是执行时间还是对CPU的消耗及GC回收都远低于String的拼结所以才有以下结论 在字符串拼结时请使用StringBuilder吧转载于:https://www.cnblogs.com/jjg0519/p/8309590.html
