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
>
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