2013/3/4 <briand@aracnet.com>:
> do you have a link to the new code ?

Diff is at the bottom of original code: http://hpaste.org/83460.

If you just pass -N, GHC automatically sets the number of threads
based on the number of cores on your machine.

Yes, I know that. I am just wondering why seemingly single threaded computation (look at singleThreadIntegrate in source code from first post) runs slower with increasing number of cores available (set through -N option).

Łukasz Dąbek