網絡連接能力未得到充分利用，爲什麼？

Question

我正在使用以下代碼嘗試測試在增加併發連接數（即ClientCount應用程序配置值）時，網絡消耗（從任務管理器的網絡選項卡監控）是否會增加。但是我發現，即使我將客戶端數量從100增加到500，網絡消耗仍然相同（從客戶端和服務器端都在3％-4％左右）。任何想法有什麼不對？我想證明，如果客戶端的併發數量增加，客戶端和服務器的網絡消耗將會增加。

這是我的應用程序配置和客戶端代碼。該URL是本地LAN中另一臺計算機上的IIS 7.0位速率限制控制中承載的wmv文件。我使用VSTS 2008 + C＃+ .Net 3.5開發控制檯應用程序作爲客戶端。

<?xml version="1.0" encoding="utf-8" ?> 
<configuration> 
    <system.net> 
    <connectionManagement> 
     <add address="*" maxconnection="1000000" /> 
    </connectionManagement> 
    </system.net> 
    <appSettings> 
    <add key="URL" value="http://labtest2/test.wmv"/> 
    <add key="ClientCount" value="100"/> 
    <add key="Timeout" value="3600"/> 
    </appSettings> 
</configuration> 

class Program 
{ 
    private static int ClientCount = 100; 
    private static string TargetURL = String.Empty; 
    private static int Timeout = 200; 

    static void PerformanceWorker() 
    { 
     Stream dataStream = null; 
     HttpWebRequest request = null; 
     HttpWebResponse response = null; 
     StreamReader reader = null; 
     try 
     { 
      request = (HttpWebRequest)WebRequest.Create(TargetURL); 
      request.Timeout = Timeout * 1000; 
      request.Proxy = null; 
      response = (HttpWebResponse)request.GetResponse(); 
      dataStream = response.GetResponseStream(); 
      reader = new StreamReader(dataStream); 

      // 1 M at one time 
      char[] c = new char[1000 * 1000]; 

      while (reader.Read(c, 0, c.Length) > 0) 
      { 
       Console.WriteLine(Thread.CurrentThread.ManagedThreadId + ":\t" + c[0]); 
      } 
     } 
     catch (Exception ex) 
     { 
      Console.WriteLine(ex.Message + "\n" + ex.StackTrace); 
     } 
     finally 
     { 
      if (null != reader) 
      { 
       reader.Close(); 
      } 
      if (null != dataStream) 
      { 
       dataStream.Close(); 
      } 
      if (null != response) 
      { 
       response.Close(); 
      } 
     } 
    } 

    static void Main(string[] args) 
    { 
     TargetURL = ConfigurationSettings.AppSettings["URL"]; 
     ClientCount = Int32.Parse(ConfigurationSettings.AppSettings["ClientCount"]); 
     Timeout = Int32.Parse(ConfigurationSettings.AppSettings["Timeout"]); 
     Thread[] workers = new Thread[ClientCount]; 
     for (int i = 0; i < ClientCount; i++) 
     { 
      workers[i] = new Thread((new ThreadStart(PerformanceWorker))); 
     } 

     for (int i = 0; i < ClientCount; i++) 
     { 
      workers[i].Start(); 
     } 

     for (int i = 0; i < ClientCount; i++) 
     { 
      workers[i].Join(); 
     }   

     return; 
    } 
} 

Answer 1

也許有在服務器上的最大併發呼叫限制，你可以檢查一下嗎？某些服務器允許10個並行連接（或者實際上它們也可以是單線程並且只有一個併發呼叫）。