Re: [Haskell-cafe] Haskell performance question

dpiponi:

On Nov 8, 2007 12:16 PM, Don Stewart 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