[Haskell-cafe] Re: concurrent haskell: thread priorities
marlowsd at gmail.com
Mon Jan 12 04:24:24 EST 2009
Neal Alexander wrote:
> Simon Marlow wrote:
>> Neal Alexander wrote:
>>> Thomas DuBuisson wrote:
>>>> It seems like we could get some priority based scheduling (and
>>>> be slackers) if we allow marked green threads to be strictly
>>>> associated with a specific OS thread (forkChildIO?).
>>>> I think you want the GHC-only GHC.Conc.forkOnIO
>>> GHC.Conc.forkOnIO is helpful but doest work in this case - it doesn't
>>> attach them to the same OS thread.
>> But it does attach the thread to a particular "virtual CPU" in the GHC
>> RTS (we call them "capabilities"), with the intention that a virtual
>> CPU corresponds more or less to a real CPU core.
> Yea, but you still have the problem with FFI that uses TLS don't you?
> What about having a forkOnOS version with processor affinity? Or is
> there a way to "upgrade" a thread created with forkOnIO to Bound.
Yes, forkOnOS would be possible (you can write it yourself using the
primitives, in fact).
> I have a thread with soft real-time requirements that cooperatively
> yields and uses thread local state. Right now there just doesn't seem to
> be any options.
Right - real-time and priorities are things that we don't do at the moment,
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