> > It is not always a thread. ForkIO creates a spark and then the > > scheduler decides when sparks should be scheduled to threads. Thus > > you get a guarantee of concurrent but not parallel execution. > > That is not correct - it is "par" that creates sparks may be discarded. >
I guess I should have been clearer. A forkIO thread is not an OS thread necessarily. Sparks may become threads or be discarded in the par sense. > forkIO always creates new threads, though it is of course up to the > scheduler > when the threads are executed, and how many cores are used. > Yes, this is my understanding as well.
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