最大并发HttpWebRequests数
我正在对Web应用程序进行压力测试，并设置了一个Windows测试程序，该程序可以旋转多个线程，并在每个线程上发送Web请求。
问题是我得到以下输出：
01/09/09 11:34:04 Starting new HTTP request on 10 01/09/09 11:34:04 Starting new HTTP request on 11 01/09/09 11:34:04 Starting new HTTP request on 13 01/09/09 11:34:05 Starting new HTTP request on 14 01/09/09 11:34:05 Starting new HTTP request on 11 01/09/09 11:34:05 11 has finished! 01/09/09 11:34:05 Starting new HTTP request on 13 01/09/09 11:34:05 13 has finished! 01/09/09 11:34:05 Starting new HTTP request on 14 01/09/09 11:34:05 14 has finished! 01/09/09 11:34:05 Starting new HTTP request on 11 01/09/09 11:34:05 11 has finished! 01/09/09 11:34:05 Starting new HTTP request on 14 01/09/09 11:34:05 14 has finished! 01/09/09 11:34:05 Starting new HTTP request on 13 01/09/09 11:34:05 13 has finished! 01/09/09 11:34:05 Starting new HTTP request on 15 01/09/09 11:34:06 Starting new HTTP request on 11 01/09/09 11:34:06 11 has finished! 01/09/09 11:34:06 Starting new HTTP request on 14 01/09/09 11:34:06 14 has finished! 哪种看起来最多有5个线程，即使我这样创建100个：
int numberOfThreads = Convert.ToInt32(txtConcurrentThreads.Text); List workers = new List(); for (int N = 0; N < numberOfThreads; N++) { BackgroundWorker worker = new BackgroundWorker(); worker.DoWork += new DoWorkEventHandler(worker_DoWork); worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted); workers.Add(worker); } foreach(BackgroundWorker worker in workers) { worker.RunWorkerAsync(); }
任何人都可以告诉我发生了什么事吗？
谢谢
编辑：如果按照建议我睡了5秒，而不是httpwebrequest，那么我确实得到更多的线程射击，但没有我想象的那么多：
01/09/09 11:56:14 Starting new HTTP request on 7 01/09/09 11:56:14 Starting new HTTP request on 11 01/09/09 11:56:15 Starting new HTTP request on 12 01/09/09 11:56:15 Starting new HTTP request on 13 01/09/09 11:56:16 Starting new HTTP request on 14 01/09/09 11:56:16 Starting new HTTP request on 15 01/09/09 11:56:17 Starting new HTTP request on 16 01/09/09 11:56:17 Starting new HTTP request on 17 01/09/09 11:56:18 Starting new HTTP request on 18 01/09/09 11:56:19 Starting new HTTP request on 7 01/09/09 11:56:19 7 has finished! 01/09/09 11:56:19 Starting new HTTP request on 11 01/09/09 11:56:19 11 has finished! 01/09/09 11:56:19 Starting new HTTP request on 19 01/09/09 11:56:20 Starting new HTTP request on 20 01/09/09 11:56:20 Starting new HTTP request on 12 01/09/09 11:56:20 12 has finished!
它仍然看起来我每秒只开始2个线程，这对我来说似乎很慢。 我想Console.WriteLine可能有问题吗？
编辑：我设置
ThreadPool.SetMinThreads(100, 4);
和
System.Net.ServicePointManager.DefaultConnectionLimit = 100;
并得到以下结果：
01/09/09 14:00:07 Starting new HTTP request on 11 01/09/09 14:00:07 Starting new HTTP request on 81 01/09/09 14:00:07 Starting new HTTP request on 82 01/09/09 14:00:07 Starting new HTTP request on 79 01/09/09 14:00:07 Starting new HTTP request on 83 01/09/09 14:00:07 Starting new HTTP request on 84 01/09/09 14:00:07 Starting new HTTP request on 85 01/09/09 14:00:07 Starting new HTTP request on 87 01/09/09 14:00:07 Starting new HTTP request on 88 ... 01/09/09 14:00:07 84 has finished! Took 323.0323 milliseconds 01/09/09 14:00:08 88 has finished! Took 808.0808 milliseconds 01/09/09 14:00:08 96 has finished! Took 806.0806 milliseconds 01/09/09 14:00:08 94 has finished! Took 806.0806 milliseconds 01/09/09 14:00:08 98 has finished! Took 801.0801 milliseconds 01/09/09 14:00:08 80 has finished! Took 799.0799 milliseconds 01/09/09 14:00:08 86 has finished! Took 799.0799 milliseconds 01/09/09 14:00:08 92 has finished! Took 799.0799 milliseconds 01/09/09 14:00:08 100 has finished! Took 812.0812 milliseconds 01/09/09 14:00:08 82 has finished! Took 1010.101 milliseconds
因此能够同时推出大量的Web请求。 这似乎排队（呼叫STA COM +服务器），这就是我的预期。
谢谢你的帮助
您的所有（或大多数）请求是否都有机会进入同一主机？ 每个主机有一个内置限制。 您可以在system.Net connectionManagement元素的app.config中更改此设置。
另一件事是线程池只逐渐增加其线程数 – 它每半秒启动一个新线程，IIRC。 那可能是你所看到的吗？ 尝试从等式中删除HttpWebRequest – 只需睡几秒钟而不是……
我怀疑后一个问题是你最初遇到的问题，但第一个问题也会引起你的问题。
同时传出HTTP连接的数量有限制。 我认为您可以在创建HttpWebRequest对象之前使用System.Net.ServicePointManager.DefaultConnectionLimit静态属性来控制它。
如果我在windows config中写下tag，而不是每次执行下面的代码时都执行。 因此，每次执行下面的代码时，我将被允许最大1000000没有并行请求/响应。
HttpWebRequest POSTRequest = (HttpWebRequest)WebRequest.Create("http://yahoo.com");
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对于.NET Core，我没有听说过这个。 ServicePointManager未包含在.NET Core 1中，但在版本2中似乎又回来了。但是，对于HttpClient，您还可以设置最大连接数，如下所示：
new HttpClient(new HttpClientHandler { MaxConnectionsPerServer = 100 })