On Wed, Apr 9, 2008 at 2:25 PM, Sebastian Sylvan <sebastian.sylvan at gmail.com> wrote: > Nope! > > This is GHC 6.8.2 btw, downloaded the binary from the web site, so it's > nothing strange. On my hyper-threaded CPU, your original code works fine. With -N2, I see 100% CPU. With N1, only 50%. I am also using GHC 6.8.2. Justin