[Haskell-cafe] Progress on shootout entries
sebastian.sylvan at gmail.com
Tue Jan 3 21:13:57 EST 2006
On 1/4/06, Sebastian Sylvan <sebastian.sylvan at gmail.com> wrote:
> On 1/3/06, Chris Kuklewicz <haskell at list.mightyreason.com> wrote:
> > Hello,
> > Where there were no entries to the
> > http://shootout.alioth.debian.org/benchmark.php?test=chameneos&lang=all
> > benchmark, there are now two. The one by Josh Goldfoot is already
> > posted, the one Einar Karttunen and I optimized has been submitted and
> > will run faster/smaller. Our code is at
> > http://haskell.org/hawiki/ChameneosEntry
> > Now for improving the fasta benchmark,
> > http://shootout.alioth.debian.org/benchmark.php?test=fasta&lang=all ,
> > which currently has a space leak in the Haskell entry.
> > A non-leaking version which has been optimized to run 3.5 times faster
> > is now up at http://haskell.org/hawiki/FastaEntra (ooops..my spelling
> > mistake).
> > It could still be made to run about 3 times faster, if the other
> > languages are any guide. Anyone want to help polish this one?
> > Also, two other existing entries have space leaks, as can be seen at
> > http://shootout.alioth.debian.org/benchmark.php?test=all&lang=ghc&lang2=ghc
> I took a stab at the rev-comp one due to boredom. It's not a space
> leak, believe it or not, it's *by design*...
> My god, I think someone is consciously trying to sabotage Haskell's reputation!
> Instead of reading input line-by-line and doing the computation, it
> reads a whole bunch of lines (hundreds of megs worth, apparently) and
> only does away with them when a new header appears.
> Anyway, I uploaded a dead simple "first-naive-implementation" which is
> significantly faster (and more elegant):
> complement i = complArr ! i'
> where i' = toUpper i
> complArr = array ('A','Z') (self ++ complAssoc)
> where self = az `zip` az
> az = ['A'..'Z']
> complAssoc = [
> process header@('>':xs) = putStrLn header
> process x = putStrLn (map complement x)
> main = do xs <- getContents
> mapM process (lines xs)
Oops! Apologies to whoever wrote the orignal version! Apparently I
didn't read the spec carefully enough, the sequences are supposed to
be reversed, which is why simply writing one line at a time doesn't
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