[Haskell-cafe] parallel Haskell
rein.henrichs at gmail.com
Thu Jul 6 17:34:02 UTC 2017
Please take a look at Simon Marlow's free book, *Parallel and Concurrent
Programming in Haskell* (http://chimera.labs.oreilly.com/books/1230000000929).
It will teach you a lot about... the things in the title.
On Thu, Jul 6, 2017 at 10:21 AM Claude Heiland-Allen <claude at mathr.co.uk>
> Hi Dennis,
> On 06/07/17 17:53, Dennis Raddle wrote:
> > I have a program which does backtracking search in a recursive
> > function. I followed the chapter in "Real World Haskell" to parallelize
> > There's no effect from the R.W.H. ideas. Can I get some suggestions as
> > to why?
> You can get timing and other useful diagnostics by compiling with
> -rtsopts and running with +RTS -s, no need to measure CPU time in your
> own program.
> > force :: [a] -> ()
> > force xs = go xs `pseq` ()
> > where go (_:xs) = go xs
> > go  = 1
> This force doesn't do enough, it just walks the spine. Try this, which
> forces the elements as well as the shape:
> force :: [a] -> ()
> force xs = go xs `pseq` ()
> where go (x:xs) = x `pseq` go xs
> go  = 1
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