I'm developing an application that, under certain conditions, spawns
quite a few NSURLDownload for several different files/urls at several
different servers.
While checking what was happening under the hood, i discovered that i
can never get more than 4 simultaneous connections. If i spawn 20,
(NSLog shows they were inited and started) only 4 open immediately.
After that, a new is started everytime an existing one is finished.
I have no queuing mechanism!
Does anyone have a clue as to how i can circumvent this limitation
(if, indeed, it is a limitation)?
- sample flow
: instantiate 20 NSURLDownload (they're started with the init method
so no further action is needed)
: for each, log instantiation result (nil? always false)
: check Activity Monitor for open files/pipes. Only 4 sockets at a time
: NSLog each downloadDidFinish and downloadDidReceiveResponse
: Everytime a downloadDidFinish occurs, a new
downloadDidReceiveResponse also occurs until all are finished
: simple debug action taken:
: increment downloadCount variable at each downloadDidReceiveResponse
: decrement downloadCount variable at each downloadDidFinish/
FailWithError
: evey NSLog of downloadCount reads 4 until less than 4 downloads
are left to complete
Cheers
Filipe Varela
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