Control.Parallel.Strategies.parMap CPU usage
Christian Höner zu Siederdissen
choener at tbi.univie.ac.at
Mon Mar 30 19:36:48 EDT 2009
thank you very much Simon & Don, for the answers.
The latest head gives great results on parallel programs. All cores are
now always at work as I hoped for. So, too, thanks to everybody involved
in the multicore improvements -- they should come very handy. :-)
* Don Stewart <dons at galois.com> [30.03.2009 19:02]:
> > Hi,
> > having tried the 6.10.2rc1 release candidate, I still find that "parMap
> > rnf xs" on a list of thunks xs does not optimally use all available
> > processors. With N the number of cores, I still see that each block of N
> > thunks (say: x_1 and x_2) has to be calculated before (x3 and x4) will be
> > started.
> > Would there be hope that compiling the latest head instead of 2009/03/14 (rc1) gives better results?
> Yes, definitely. The HEAD implements all the `par` improvements
> described in the recent "multicore runtime" paper, as well as giving
> detailed runtime statistics on spark use.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Size: 197 bytes
Desc: not available
Url : http://www.haskell.org/pipermail/glasgow-haskell-users/attachments/20090331/98716bcf/attachment-0001.bin
More information about the Glasgow-haskell-users