Re: [Haskell-cafe] Threading and Mullticore Computation

It gets a bit faster in general but the problem remains. I have two threads in both runs, once I use 1 core and then 2 cores. The second run is much slower. On 3 Mar 2009 at 17:32, Sebastian Sylvan wrote:

On Tue, Mar 3, 2009 at 5:31 PM, wrote: In both runs the same computations are done (sequentially resp. parallel), so the gc should be the same. But still using 2 cores is much slower than using 1 core (same program - no communication).

Might there not be contention in the allocator/GC that's worsened by having two threads? What happens with -O2? -- Sebastian Sylvan +44(0)7857-300802 UIN: 44640862