I am using 6.12... are there any good pointers as to how one uses threadscope?
On Mon, Jan 4, 2010 at 3:14 PM, Neil Mitchell <[email protected]> wrote: > Hi Jamie, > > First question, what version of GHC are you using? There are > significant performance improvements to parallel code in GHC 6.12, so > it's worth an upgrade. Once you've upgraded you might want to try out > threadscope which is designed to help track down these sorts of > problems. > > If you are using 6.10, I recommend turning off parallel garbage > collection with the RTS flags (see the manual) as that can cause > slowdowns. > > Thanks, Neil > > 2010/1/4 Jamie Morgenstern <[email protected]>: > > Hello; > > > > I have a piece of code in which I employ the `par` construct to add some > implicit parallelism > > to a theorem prover. However, when running the *same* code with > > > > +RTS -N1 > > +RTS -N5 > > +RTS -N10 > > > > I see a huge slowdown (a factor of 50 with 5 processes and a factor of > 100 for 10 on an 8-core machine). > > > > Very little time is being spent using the garbage collector. Any > suggestions? > > > > Thanks, > > -Jamie > > > > _______________________________________________ > > Haskell-Cafe mailing list > > [email protected] > > http://www.haskell.org/mailman/listinfo/haskell-cafe > > > > >
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