Simon Marlow schrieb:
Christian Maeder wrote:
Dear Hets- and GHC-Developers,
we have a problem using ghc-6.6.1. The created hets binary runs a couple of times slower than the one created using ghc-6.6. (see below)
What might be the cause for this?
Very strange. The performance has decreased dramatically, but the profile looks the same: that is, performance has degraded more or less consistently across the whole code. I have to ask: did you turn on -O?
-O was turned off in both cases. (Optimization usually only accounts for a factor of 3 -- and not 8 or even more.) Sorry for my panic. The slow down is caused by the last change described in http://web.engr.oregonstate.edu/~erwig/fgl/haskell/CHANGES The additional loops in Data.Graph.Inductive.Graph (also added at the end of a possibly long list) make our algorithm slower. context1l' :: Context a b -> Adj b context1l' (p,v,_,s) = p++filter ((==v).snd) s context4l' :: Context a b -> Adj b context4l' (p,v,_,s) = s++filter ((==v).snd) p Cheers Christian