Re: [Haskell-cafe] Re: Library design question

20 Sep 2008


      Am Samstag, 20. September 2008 17:46 schrieb Andre Nathan:
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On Sat, 2008-09-20 at 14:56 +0200, Daniel Fischer wrote:
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modify' f = do
    s <- get
    put $! f s
Or try Control.Monad.State.Strict.
Control.Monad.State.Strict did it for me, but the strict modify didn't.
I tried using modify' and also
randomDouble = do
    g <- get
    let (r, g') = random g
    put $! g'
    return r
instead of
randomDouble = State random
Any hints on how I could find where else the program is being too lazy?
Profiling. Find out where your programme spends its time and what uses the 
memory. Add lots of {-# SCC #-} pragmas to get a more detailed picture.
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Thanks,
Andre