[Haskell-cafe] Re: Hugsvs GHC (again)was: Re: Somerandomnewbiequestions
k.schupke at imperial.ac.uk
Wed Jan 19 11:57:58 EST 2005
Simon Marlow wrote:
>On 19 January 2005 16:49, Keean Schupke wrote:
>>But what about the continuing computation... we do not want
>>the fastest IO system, but we want the program to comlete the
>>fastest... So ideally we want 2 threads!
>>One runs the Haskell code that is not waiting for IO. (IE other
>>Haskell threads)... The other runs a select loop as you suggest!
>>This way the number of threads is fixed (2) and execution never
>>'blocks' for IO. (Simon, what about this scheme?)
>This is what GHC does, if I understand you correctly. The thread
>running select() does so in its own OS thread, while another OS thread
>runs the Haskell code. As long as you use -threaded, that is. Oh, and
>before GHC 6.4 it was done a different way - the scheduler used to do
>the select() between running Haskell threads.
So this means even though the IO calls block, the other Haskell threads
(when run with -threaded) keep running?
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