Comments on: Concurrency => Parallelism http://www.sauria.com/blog/2009/10/06/concurrency-parallelism/ Open Source, Modern Programming Languages, OS X, Photography, and ... Thu, 19 Jan 2012 07:08:30 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Parallelism /= Concurrency « GHC Mutterings http://www.sauria.com/blog/2009/10/06/concurrency-parallelism/comment-page-1/#comment-16500 Parallelism /= Concurrency « GHC Mutterings Thu, 08 Oct 2009 08:13:21 +0000 http://www.sauria.com/blog/2009/10/06/concurrency-parallelism/#comment-16500 [...] Concurrency => Parallelism at Ted Leung on the Air Says: October 7, 2009 at 6:45 am [...] [...] Concurrency => Parallelism at Ted Leung on the Air Says: October 7, 2009 at 6:45 am [...]

]]> By: Ted Leung http://www.sauria.com/blog/2009/10/06/concurrency-parallelism/comment-page-1/#comment-16499 Ted Leung Wed, 07 Oct 2009 16:38:14 +0000 http://www.sauria.com/blog/2009/10/06/concurrency-parallelism/#comment-16499 Thanks for the pointer to the strategies paper - I'll definitely take a closer look. From Chapter 24 in Real World Haskell, it looked like strategies were mostly a way of controlling the behavior of par and parseq. Thanks for the pointer to the strategies paper – I’ll definitely take a closer look. From Chapter 24 in Real World Haskell, it looked like strategies were mostly a way of controlling the behavior of par and parseq.

]]> By: Simon Marlow http://www.sauria.com/blog/2009/10/06/concurrency-parallelism/comment-page-1/#comment-16494 Simon Marlow Wed, 07 Oct 2009 08:22:24 +0000 http://www.sauria.com/blog/2009/10/06/concurrency-parallelism/#comment-16494 I agree - we definitely do want to parallelise all those concurrent programs we have lying around. But I want to correct this point: "I explicitly stated that I was not as interested in highly regular or data parallel computations, which is what Haskell’s parallelism tools are aimed at." In addition to concurrency, Haskell has two programming models for parallelism, only one of which is aimed at highly regular data-parallel problems. The other (Strategies) is perfectly suited to irregular problems and ad-hoc parallelisation of existing sequential programs. Take a look at the excellent paper "Algorithm + Strategies = Parallelism" (http://www.macs.hw.ac.uk/~dsg/gph/papers/html/Strategies/strategies.html). I agree – we definitely do want to parallelise all those concurrent programs we have lying around. But I want to correct this point:

“I explicitly stated that I was not as interested in highly regular or data parallel computations, which is what Haskell’s parallelism tools are aimed at.”

In addition to concurrency, Haskell has two programming models for parallelism, only one of which is aimed at highly regular data-parallel problems. The other (Strategies) is perfectly suited to irregular problems and ad-hoc parallelisation of existing sequential programs. Take a look at the excellent paper “Algorithm + Strategies = Parallelism” (http://www.macs.hw.ac.uk/~dsg/gph/papers/html/Strategies/strategies.html).

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