wasserman.louis: > While working on the Shootout, I noticed the following benchmarks: > > http://shootout.alioth.debian.org/u64/program.php?test=chameneosredux&lang=ghc&; > id=3 > http://shootout.alioth.debian.org/u64q/program.php?test=chameneosredux&lang= > ghc&id=3 > > The same program becomes almost 4 times slower when compiled with --threaded > and run with +RTS -N5 -- even though the multi-core benchmark really only ever > uses one processor.
Using -N5 sounds suspicious. There are only 4 cores on the machine. > Other languages seem to have found a way of arranging these threads in a way > such that parallelism actually happens, but as it stands, compiling this > benchmark without --threaded actually makes Haskell competitive against the > genuinely parallel alternatives in other languages...which is unusual by > itself. > > I wanted to throw this out for people to discuss, because I'd like to see it > improved. As it stands, I'm going to submit a version which asks not to be > compiled with --threaded (and has a few other improvements). What parallelization did you try? Is it a good algorithm? -- Don _______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe
