Re: [Haskell-cafe] SMP parallelism increasing GC time dramatically

On Mon, Oct 10, 2011 at 16:44, Tom Thorne wrote:

thanks! I just tried setting -A32M and this seems to fix the parallel GC problems, I now get a speedup with parallel GC on and performance is the same as passing -qg. I had tried -H before and it only made things worse, but -A seems to do the trick.

You might be able to use ghc-gc-tune [1] to find the right settings for -A and -H. Erik [1] http://hackage.haskell.org/package/ghc-gc-tune