lemming: > > On Sun, 17 Jun 2007, Donald Bruce Stewart wrote: > > > simonmarhaskell: > > > Henning Thielemann wrote: > > > > > > >The program is compiled with GHC-6.4 and option -O2, CPU clock 1.7 GHz. > > > > > > ByteString is much faster with GHC 6.6, IIRC. We optimised the > > > representation of ForeignPtr, and ByteString takes advantage of that. I > > > recommend upgrading. > > > > Yes, a 2x speedup isn't uncommon. > > Indeed, in my simple example the speedup factor was 2. However this is > still far from being enough for real-time signal processing. I found > another problem: The rounding functions from RealFrac are much slower than > GHC.Float.double2Int. I've set up a bug ticket in GHC trac.
if there's floating point math involved, carefully check the Core output. -ddump-simpl -O2 > > > ByteString is even faster with the GHC head, branch, given the cranked > > up rules and constructor specialisation. > > Can I test them without compiling GHC myself? I.e. can I still install the > FPS package separately? oh, i was just suggesting trying the GHC HEAD branch for its improved optimisations, not the `unstable' branch of fps. -- Don _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe