[Haskell-cafe] are forkIO threads event-driven?

[Don Stewart]

bulat.ziganshin:
> Hello Aran,
> 
> Friday, April 30, 2010, 2:26:20 AM, you wrote:
> 
> > In GHC, if a thread spawned by forkIO blocks on some network or
> > disk IO, is the threading system smart enough not to wake the thread
> 
> afaik, yes. it's controlled by special i/o thread that multiplexes all
> i/o done via stdlibs. but ghc i/o manager can't use epoll/kqueue so
> it's appropriate only for small (or medium?) servers

Look at the recent work on the event library and replacing the IO
manager.

    http://www.serpentine.com/blog/2010/01/22/new-ghc-io-manager-first-benchmark-numbers/

There's much more background on the new code here,

    http://www.serpentine.com/blog/2009/12/17/making-ghcs-io-manager-more-scalable/

and some nice benchmarks

    http://blog.johantibell.com/2010/01/scalable-timeout-support-for-ghcs-io.html