[Mono-bugs] [Bug 624849] BlockingCollection<T> takes 100% cpu when blocking for an element

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http://bugzilla.novell.com/show_bug.cgi?id=624849

http://bugzilla.novell.com/show_bug.cgi?id=624849#c6


--- Comment #6 from Rickard Edström <ickard at gmail.com> 2010-07-31 17:14:33 UTC ---
This reduces cpu usage to alot on this machine. However, when comparing
BlockingCollection (mono master) running on .net, with the built-in .net 4
BlockingCollection, the mono version takes about 2% cpu, while the built-in
does not show up at all (less than 1%).
I looked at the code and it seems there are no usage at all of any signaling or
something. The .net version probably uses ManualResetEventSlim or SemaphoreSlim
to actually sleep until it is signaled (by adding an element). The mono one
just spins alot which is plain wrong. (spinning should afaict only be used in a
short while before actually waiting, but this behaviour is built-in to
ManualResetEventSlim and SemaphoreSlim)

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