I think the HEAD goes just as fast as 6.2 now. Simon | -----Original Message----- | From: glasgow-haskell-users-bounces@haskell.org [mailto:glasgow-haskell-users- | bounces@haskell.org] On Behalf Of Jeremy Shaw | Sent: 24 February 2004 04:04 | To: glasgow-haskell-users@haskell.org | Subject: Re: ghc and signal processing | | Hrm, | | Okay, it seems that my problems maybe be due to using ghc 6.3. | | Here are the results of running test under different compiler versions | (see end of message for code): | | | Athlon 600MHz + FreeBSD + GHC 6.0.1 | | real 0m0.414s | user 0m0.361s | sys 0m0.016s | | Athlon 600MHz + FreeBSD + GHC 6.3 (built from CVS HEAD on Feb 15, 2004) | | real 0m2.517s | user 0m2.289s | sys 0m0.069s | | Pentium III 1.13GHz + Debian + GHC 6.2 | | real 0m0.305s | user 0m0.196s | sys 0m0.027s | | Pentium III 1.13GHz + Debian + GHC 6.3 (built from CVS HEAD on Feb 1, 2004) | | | real 0m1.302s | user 0m1.196s | sys 0m0.044s | | | So it seems like maybe GHC 6.3's performance for this particular test | is around 3-5 slower? | | Jeremy Shaw. | | | module Main where | | import Data.Array | import Data.Array.IO | | import System.IO | | main = do h <- openFile "test.b" WriteMode | a <- newArray_ (1,1800000) | b <- mapArray id a | c <- mapArray id b | hPutArray h c 1800000 | | | At Mon, 23 Feb 2004 13:37:45 -0800, | Mike Gunter wrote: | > | > | > Hmmm. With -O2 on GHC 6.2, I get 0.177s, 0.217s, and 0.348s for your | > three Haskell examples and 0.187s (with gcc -O2) for your C example. | > The output of -ddump-simpl for the looks perfect for the second | > Haskell example. My GHC seems to be doing a bang-up job here. What's | > wrong with yours? (For the third example GHC's code could be improved | > by additional inlining or hoisting of a constant array outside of the | > loop.) | > | > mike | > | _______________________________________________ | Glasgow-haskell-users mailing list | Glasgow-haskell-users@haskell.org | http://www.haskell.org/mailman/listinfo/glasgow-haskell-users