我正在对一个网络应用程序进行压力测试,并设置了一个 Windows 测试程序,该程序启动多个线程并在每个线程上发送一个网络请求。
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!
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<BackgroundWorker> workers = new List<BackgroundWorker>();
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();
}
谁能告诉我这是怎么回事?
谢谢
编辑:如果按照建议我休眠 5 秒钟,而不是 httpwebrequest,那么我确实会触发更多线程,但没有我预期的那么多:
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!
看起来我每秒只启动 2 个线程,这对我来说似乎很慢。我想 Console.WriteLine 可能是个问题?
编辑:我设置
ThreadPool.SetMinThreads(100, 4);
和
System.Net.ServicePointManager.DefaultConnectionLimit = 100;
得到如下结果:
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
因此能够同时发出大量网络请求。这似乎在排队(调用 STA COM+ 服务器),这正是我所期望的。
谢谢你的帮助
最佳答案
您的所有(或大部分)请求是否偶然发往同一主机?每个主机都有一个内置限制。您可以在 system.Net 的 app.config 中更改此设置 connectionManagement元素。
另一件事是线程池只会逐渐增加它的线程数量——它每半秒启动一个新线程,IIRC。这可能是你所看到的吗?尝试从等式中去掉 HttpWebRequest
- 只需睡几秒钟...
我怀疑后一个问题是您最初遇到的问题,但第一个问题也会给您带来问题。
关于.net - 最大并发 Http Web 请求数,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/9843369/