[Haskell-cafe] Re: concurrent haskell: thread priorities
wqeqweuqy at hotmail.com
Fri Jan 9 15:58:09 EST 2009
Simon Marlow wrote:
> Neal Alexander wrote:
>> Thomas DuBuisson wrote:
>>> It seems like we could get some priority based scheduling (and still
>>> 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.
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.
More information about the Haskell-Cafe