On 14/12/09 19:04, Jost Berthold wrote:
Luca,
to use Control.Parallel, you need to download and install two packages, deepseq and parallel, from hackage.haskell.org. Most likely this will work with cabal, or you just download the two tarballs .
cabal install parallel (assuming you have a working cabal-install)
The reason is, when packaging "parallel", this package has been removed from the GHC core libraries. BTW I am unsure whether this is at all clever, since it needs specific GHC support (at least for now - am I right here?)
In addition, be informed that Control.Parallel.Strategies has been heavily restructured just last month (splitting it into deepseq and parallel is one of the changes, but not the most fundamental). If you want to try examples from GpH publications, you will certainly have some problems. parallel-1.x versions containing the original definitions are on hackage as well and should work for experiments.
I think it would be a good idea to have a wiki page describing the differences between the API used in those papers and the current API. Off the top of my head, the main differences are: * import Control.Parallel.Strategies, not import Strategies * seq is now pseq * rnf is now rdeepseq * don't use demanding, sparking Better still would be a selection of recipes or patterns for parallelising Haskell code. Anyone feel like tackling this? (I realise I'm the obvious person to do it, but I'm deep in mid-hack on the parallel GC and don't want to get too distracted right now). Cheers, Simon