Are you running x64 or on Intel hardware? What results do you get for 12, 13
or 14 instead of 9?
I am running an AMD Phenom 9950, but the Ubuntu I'm using is just
32-bit. I tried 5/ray.hs with level=12 instead of 9 but it ran into a
stack overflow problem. When I increased the stack size it completed but
it also took more time than 1/ray.hs, which required no stack size
increase. I made sure that the other arguments I fed it were the same. I
think there is some problem that needs to be worked out in the 5/ray.hs.
Maybe the problem is in ghc, I'm not sure. Below, ./ray5 is 5/ray.hs,
and ./ray is 1/ray.hs
j...@ubuntu:~/Desktop$ time ./ray 12 512 > /dev/null
real 0m21.479s
user 0m21.093s
sys 0m0.180s
j...@ubuntu:~/Desktop$ time ./ray5 12 512 +RTS -K2000000000 > /dev/null
real 0m28.366s
user 0m25.674s
sys 0m2.608s
j...@ubuntu:~/Desktop$ time ./ray 14 512 > /dev/null
real 0m23.544s
user 0m23.021s
sys 0m0.500s
I tried level=14 but I ran out of memory for 5/ray.ml and 5/ray.hs.
I considered that maybe I had saved the files from your website wrong,
or mixed them up during compilation. So I ran the timer again with
level=9 and level=12 and got all the same results. That is, level=9 is
faster on 5/ray.hs but level=12 is faster with 1/ray.hs. So I don't
think I'm making a simple manual labor error.
It seems that 5/ray.ml and 5/ray.hs aren't quite equivalent in some
important way since 1/ray.ml is faster than 5/ray.ml for both level=9
and level=12. Whether it's a code problem or compiler problem, I cannot say.
The stack size problem does not go away when I remove all the extra
optimization arguments to ghc.
--Jeff
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