Guido van Rossum added the comment: According to http://msdn.microsoft.com/en-us/library/aa365198%28VS.85%29.aspx once you call GetQueuedCompletionStatus() your thread is managed by the IOCP and only up to a given parameter of those threads are allowed to run. They recommend setting that parameter to the number of CPUs. This feels scary (doubly so in the light of the GIL).
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