| I'm working on a project for which the solution is highly | parallelizable. I've been writing it so far for GHC as a single-threaded | app. I'd like to be able to split the job into multiple pieces, and | spawn different system threads for each piece, so they will run on | separate CPUs. Either each thread needs to write to the same IO handle, | or else the results need to be collected when the threads are merged, so | the results can all be printed. GHC 6.6 (release candidate available) supports parallel execution on SMP machines. http://www.haskell.org/ghc/dist/current/docs/users_guide/sec-using-smp.h tml Garbage collection is not parallelised yet, something we plan to fix this autumn. If you want a distributed memory machine (e.g. cluster of boxes) then you may want GPH, http://www.macs.hw.ac.uk/~dsg/gph/ although it's based on an older version of GHC. Simon | -----Original Message----- | From: haskell-cafe-bounces@haskell.org [mailto:haskell-cafe-bounces@haskell.org] On Behalf Of Lyle | Kopnicky | Sent: 20 September 2006 03:46 | To: haskell-cafe@haskell.org | Subject: [Haskell-cafe] System threads? | | Hi folks, | | I'm working on a project for which the solution is highly | parallelizable. I've been writing it so far for GHC as a single-threaded | app. I'd like to be able to split the job into multiple pieces, and | spawn different system threads for each piece, so they will run on | separate CPUs. Either each thread needs to write to the same IO handle, | or else the results need to be collected when the threads are merged, so | the results can all be printed. | | I'm working on Linux. What's the easiest way to accomplish this? Glasgow | Parallel Haskell? Is there a Posix.Threads library? I understand that | Haskell threads (Control.Concurrent) all run in one system thread, so | would not take advantage of SMP. | | I suppose in the worst case I can write a shell program that divides up | the problem, runs several worker processes to output intermediate | results to files, then combines the results to the desired filehandle. | | Thanks, | Lyle | _______________________________________________ | Haskell-Cafe mailing list | Haskell-Cafe@haskell.org | http://www.haskell.org/mailman/listinfo/haskell-cafe