[Haskell-cafe] Program optimisation

[Adrian Hey]

David Roundy wrote:
 > I remember once going through all sorts of pain trying to avoid
 > stack overflows when using Data.Map to compute a histogram, which
 > all would have been avoided if there were a strict version of
 > Data.Map (or even just strict functions on the lazy Data.Map).

Then what you need is the new Data.Map clone..

  http://darcs.haskell.org/packages/collections-ghc6.6/Data/Map/AVL.hs

which I believe has all the strictness control you could want.

Regards
-- 
Adrian Hey