[Haskell-cafe] You are in a twisty maze of concurrency libraries,
all different ...
patc at pessce.net
Fri Dec 4 06:51:10 EST 2009
I'm looking for the "right" concurrency library/semantics for what
should be a reasonably simple problem.
I have a little simulator:
runWorldSim :: MTGen -> SimState -> IO SimState
it takes about a second to run on a PC. It's functional except it whacks
the rng, which needs IO. I run 5-10 of these jobs, and then use:
mergeWorld :: [SimState] -> SimState
to pick the best features of the runs and build another possible world
(state). Then I use this new world to run another 5-10 jobs and so on.
I run this through ~20000 iterations.
It's an obvious place for parallelism.
I'm looking for a concurrency library with something like:
forkSequence :: Int -> [IO a] -> IO [a]
which I could call with something like this:
forkSequence 4 (take 10 (repeat (runWorldSim g ss)))
this would construct 4 threads, then dispatch the 10 jobs onto the
threads, and pack up the
results into a list I could run through my merger.
It strikes me as something someone would already have done, but I can't
find anything in hackage. Probably I've missed something obvious? Any
If not, what would be the best/easiest existing package to write an
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