On Tuesday 16 March 2004 2:09 am, Sven Panne wrote:
Shawn P. Garbett wrote:
[...] Haskell Version on my laptop, FPS = 103 C Version on my laptop, FPS = 192 [...]
I just gave your example a quick try on my PC, the results do not differ that much for my setup (SuSE x86 Linux 8.2, 3GHz P4, NVIDIA FX 5900):
Haskell version: 6000 FPS C version: 7165 FPS
That's even better. The actual difference isn't x2 on a fast box, but much closer. So for a performing box, the speed difference is quite acceptable given the gains of working in Haskell. Good job to the HOpenGL folks.
Curiously, using -O for the Haskell compilation doesn't make any difference. I'll take a closer look with GHC's profiler and the ltrace tool when I get some time.
Thanks for the conversion BTW, I'd like to place this example into GLUT'S "Misc" example directory, with a BSD-like license. Would that be OK?
That was the intent of the copyright at the top. Maybe I got it wrong, but it's supposed to be a BSD style license. I really don't care how it's used, but I just wanted to show my support for the BSD code sharing method. I suspect that data marshalling is most of the speed difference. As I understand when a program misses a frame refresh window, OpenGL put's it in the next frame refresh window, so the actual speed difference may be quite small and it occasionally misses the refresh window. Shawn