CPU Usage (C#) 测试

注意：算法仅供参考。

cpuusage.cs

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Diagnostics;
 4 using System.IO;
 5 using System.Linq;
 6 using System.Text;
 7 using System.Threading;
 8 
 9 namespace cpuusage
10 {
11     class Program
12     {
13         static readonly Dictionary<string, PerformanceCounter> _caches = new Dictionary<string, PerformanceCounter>();
14 
15         static void Main(string[] args)
16         {
17             const string nameTitle = "Name";
18             const string cpuUsageTitle = "CPU Usage (%)";
19             var processNames = GetProcessNames(args);
20             var nameColumnMaxLength = Math.Max(processNames.Max(n => n.Length), nameTitle.Length);
21             var cpuUsageColumnMaxLength = cpuUsageTitle.Length;
22             var format = string.Format("{{0,-{0}}}  {{1:0.##}}", nameColumnMaxLength);
23             var head = string.Format(format, nameTitle, cpuUsageTitle).ToUpper();
24             head += Environment.NewLine + string.Format(format, new string('-', nameColumnMaxLength), new string('-', cpuUsageColumnMaxLength));
25             while (true)
26             {
27                 Console.WriteLine(head);
28                 foreach (var name in processNames)
29                 {
30                     try
31                     {
32                         Console.WriteLine(format, name, GetProcessCpuUsage(name));
33                     }
34                     catch(Exception)
35                     {
36                     }
37                 }
38                 Thread.Sleep(1000);
39                 Console.WriteLine();
40             }
41             
42         }
43 
44         static string[] GetProcessNames(string[] args)
45         {
46             if (args.Length == 0)
47             {
48                 var n = Path.GetFileName(Environment.GetCommandLineArgs()[0]);
49                 var n1 = Path.GetFileNameWithoutExtension(n);
50                 Console.WriteLine("Example:\n  {0} _Total IDLE System Svchost {1}\n  {0} *\n", n, n1);
51                 return new string[] { "_Total", "IDLE", "system", "Svchost", n1 };
52             }
53 
54             if (args[0] == "*")
55             {
56                 return Process.GetProcesses().Select(n => n.ProcessName).OrderBy(n => n).Distinct().ToArray();
57             }
58 
59             return args;
60         }
61 
62         static float GetProcessCpuUsage(string instanceName)
63         {
64             // var total = GetPerformanceCounter("_Total").NextValue();
65             var value = GetPerformanceCounter(instanceName).NextValue();
66             return value / Environment.ProcessorCount;
67         }
68 
69         static PerformanceCounter GetPerformanceCounter(string instanceName)
70         {
71             PerformanceCounter r;
72             if (_caches.TryGetValue(instanceName, out r))
73             {
74                 return r;
75             }
76             r = new PerformanceCounter("Process", "% Processor Time", instanceName);
77             _caches[instanceName] = r;
78             return r;
79         }
80         
81     }
82 }

build.bat

 1 @echo off
 2 pushd "%~dp0"
 3 set csfile=cpuusage.cs
 4 set PATH="C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\MSBuild\15.0\bin\Roslyn";"C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\MSBuild\15.0\bin\Roslyn";"C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\15.0\bin\Roslyn";"C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\amd64";"C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN";C:\WINDOWS\Microsoft.NET\Framework64\v4.0.30319;C:\WINDOWS\Microsoft.NET\Framework64\v3.5;C:\WINDOWS\Microsoft.NET\Framework64\v2.0;%PATH%
 5 csc.exe /target:exe /unsafe+ %csfile%
 6 if ERRORLEVEL 1 (echo ERROR: %ERRORLEVEL%) else (echo Build Success)
 7 echo.
 8 echo Press any key to EXIT...
 9 pause>nul
10 popd

demo