27 Nov
2006
27 Nov
'06
4:27 a.m.
Hi, I've seen that guide before and followed the suggestions in there but somehow I missed the -funfolding-use-threshhold option. After setting it to 24 the code now runs about 2-3 times slower than C which is a significant improvement from a factor of 10. Thanks :) Ivan On 27/11/2006, at 12:04 AM, isto wrote:
Have you tried -O3 -optc-O3 -funfolding-use-threshold=16 compile flags? Don, Lemmih, Lennart and Bulat helped me to sort out a similar problem a couple of weeks ago. More hints can be found at http://haskell.org/haskellwiki/Performance/GHC Especially, to check generated code by taking a look of core -ddump-simpl > core.txt and to check memory leaks, you could run with +RTS -sstderr
br, Isto