Re: [Haskell-cafe] Faster timeout but is it correct?

On 18 February 2011 01:05, Johan Tibell wrote:

On Thu, Feb 17, 2011 at 5:01 PM, Bas van Dijk wrote:

...

willTimeout/old         24.34945 us    1.0 x willTimeout/new         26.91964 us    0.9 x (large std dev: 5 us) willTimeout/event       12.94273 us    1.9 x  :-)

wontTimeout/old         16.25766 us    1.0 x wontTimeout/new         637.8685 ns   25.5 x  :-) wontTimeout/event       1.565311 us   10.4 x  :-)

I find this very surprising. Both new and event eventually ends up using the event manager in the end. One via threadDelay (which calls registerTimeout) and one directly via registerTimeout. The difference should be that "new" also spawns a thread.

I guess the new timeout exploits parallelism because it forks a thread do to the work with the event manager. I think that this thread is then killed before it even begins dealing (through threadDelay) with the event manager. Bas