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I'd like to increase the maximum concurrent connections per host in Swift, which is limited to 4 by default in iOS.

I'm using Alamofire.

  • I've tried to increase the HTTPMaximumConcurrentPerHost to 50.
  • I've tried for in loop method and still limited.
  • Also tried to wrap the url request into an operation queue and still limited connections.

I've seen a library written in Obj-C tells that they use more than 4 connection at same time per host, but I don't program Obj-C to know if it is real or not. Library on Github

Is there a solution which uses more concurrent connections per host?

Apple says that this limit is per session, so this limit can be exceeded using multiple session per whole application

How that can be achieved ?

*I've tested my internet speed and server response by Charles and it was 250 Req/Second, when using above methods in simulator it was 22 Req/Second.

Ahmed_Shemari
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1 Answers1

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This seems to be the solution:

let configuration = NSURLSessionConfiguration.defaultSessionConfiguration()
configuration.HTTPMaximumConnectionsPerHost = 50
configuration.timeoutIntervalForRequest = 30
let manager = Alamofire.Manager(configuration: configuration)

Bear in mind that unless the framework uses asynchronous IO (and I don't think that NSURLSession does) that you are limited by the number of cores in the processor as to how many threads you can be executing concurrently. The answer I linked above suggests wrapping the requests in NSOperation so that you can manage the concurrency more granularly with an NSOperationQueue.

Community
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David S.
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