最大化同时http下载的数量 [英] Maximize the number of simultaneous http-downloads

问题描述

我试图尽可能多地同时执行http下载IPad2（ios6.0）。这纯粹用于测试此设备上可能的功能。甚至对GUI性能不感兴趣（如果它没有响应也不重要）

I'am trying to perform as many as possible simultaneous http-downloads an IPad2 ( ios6.0 ). This is pure for testing what is possible on this device. Even not interested in GUI performance ( not important if it doesn't respond )

我创建了一个特殊的HTTP服务器，它向客户端发送x分钟数据。收到的数据并不重要。我只测量了多少并发下载的速度。
我已经实现了两种不同的方式来安排12个HTTP请求。

I've created a special HTTP-server that sends for x minutes data to the client. The data received is of no importance. I just measure the speed an how many concurrent downloads. I've implemented 2 different ways of scheduling 12 HTTP-requests.

一个通过在队列中使用NSOperation对象完成并在12上设置NSOperationQueueDefaultMaxConcurrentOperationCount

One is done by using NSOperation objects in a Queue and set the NSOperationQueueDefaultMaxConcurrentOperationCount on 12

第二个实现是通过创建执行同步http请求的12个NSThreads。

The second implementation is by creating 12 NSThreads that perform a synchro http-request.

请求全部发送到同一目的地IP。

The requests are all sent to the same destination IP.

我观察到的是，在这两种情况下，第6到第12个请求都得到一个TimeOut（错误代码-1001）。如果1将超时值设置为80.0秒，我看到第1次完成后第6次下载开始。

What I observe is that in both cases the 6th to 12th request get a TimeOut ( errorcode -1001 ). If 1 put the timeout-value to 80.0 seconds, I see that the 6th download starts when the 1st is done.

• IOS中有多少并发下载限制？


• 还有其他方法可以执行这些并发下载吗？


• 有没有办法将线程绑定到核心（以便它不会得到中断，如C ++中的cpuaffinity）或线程优先级

推荐答案

您最多可以同时连接5个同一台服务器。这是iOS固定限制，可能是因为某些http协议限制。您可以阅读更多信息此处。

You can have maximum of 5 simultaneous connections to the same server. It's an iOS fixed limit and it's probably because of some http protocol constraints. You can read a bit more info here.

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