haskell:
Joel Koerwer wrote:
Don, that's a great little mini tutorial, exactly what I was hoping for. I'm looking forward to learning more tricks.
On an unrelated note, I have an STUArray nbody. I haven't really looked closely at the chris+dons version, but I suspect they amount to doing the same thing. I get commensurate runtimes at least. But I'll post it on the wiki in a while in case there is some optimization I missed.
On an even more unrelated note, I get slower runtimes with -optc-O3 and -optc-ffast-math than without. Individually or in tandem. Odd. This is ghc 6.4.1 and gcc 4.0.3 on a (Banias) Pentium M.
More architecture benchmarking:
On a powerbook G4, Joel Koerwer's entry on http://haskell.org/hawiki/NbodyEntry runs faster than dons+chris.
And I edited it to make it smaller, but by hoisting 'size' and 'dt' I also made it run quite a bit faster. It now takes 1.7x less time than dons+chris.
Don, could you check the speed on your architecture?
Yes! I was missing the -funbox-strict-fields, it makes a huge difference. Check the wiki page, these stuarrays are the fastest yet. Cheers, Don