Re: [Haskell-cafe] Fusing foldr's

Josef Svenningsson wrote:

Less bogus timing: avg4: 18.0s avgS: 2.2s avgP: 17.4s

OK, so these figures make an even stronger case for my conclusion :-) Single traversal can be much faster than multiple traversals *when done right*.

Did you use +RTS -N2 on your program (or whatever it is that makes GHC actually use multiple threads? or is that not necessary?) Anyway I assume you wouldn't get better than 9.0s, which is still much worse than 2.2s. Isaac