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. > 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? _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
