dpiponi: > On Nov 8, 2007 12:16 PM, Don Stewart <[EMAIL PROTECTED]> wrote: > > > If you can post the code somewhere, that would be great, with examples > > of how to reproduce your timings. > > The code is exactly what I posted originally (but nore that n is 10 > times larger in the C code). I compiled using ghc -O3 -o test test.hs. > I timed the resulting executable with unix 'time'. I think I used the > tiger Intel binary here: > http://www.haskell.org/ghc/download_ghc_661.html (ghc --version > reports only "The Glorious...verison 6.6.1", file > ~/lib/ghc-6.6.1/ghc-6.6.1 reports "Mach-O executable i386".) This was > all run on a 2.4GHz MacBook Pro with Leopard and 2Gb RAM. Anything > else you need? > > I was investigating the plausibility of implementing something like a > fluid dynamics solver completely in Haskell. I have some working C > code so I thought I'd port it. But only if there's a chance of it > being within a factor of 2 or 3 of the original speed.
Can you start by retrying with flags from the spectral-norm benchmark: http://shootout.alioth.debian.org/gp4/benchmark.php?test=spectralnorm&lang=ghc&id=0 The interaction with gcc here is quite important, so forcing -fvia-C will matter. -- Don _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe