Parallel Performance Tuning for Haskell

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Very interesting work with implications for integration into more mainstream runtimes... In general, runtime support for parallel tuning is necessary going forward. The Many Core age has only just begun... This paper is a great read.

Parallel Haskell programming has entered the mainstream with support now included in GHC for multiple parallel programming models, along with multicore execution support in the runtime. However, tuning programs for parallelism is still something of a black art. Without much in the way of feedback provided by the runtime system, it is a matter of trial and error combined with experience to achieve good parallel speedups.

This paper describes an early prototype of a parallel profiling system for multicore programming with GHC. The system comprises three parts: fast event tracing in the runtime, a Haskell library for reading the resulting trace files, and a number of tools built on this library for presenting the information to the programmer. We focus on one tool in particular, a graphical timeline browser called ThreadScope.

The Discussion

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    Yes, very interesting! Let me be the first once again to say: 'I wish there was a Haskell# or Haskell .NET'. I don't suppose there is a .NET BCL binding for WinHugs? I mean I guess you'd have to put the whole BCL in the IO monad - but it'd be a start...

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    The funniest things are the things that are true.  I wonder what percentage of the BCL methods are pure?

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    You actually raise a really good point. I wonder what MS are going to do in this area? Provide type annotations for existing stuff or just take a deep breath and start a parallel (sic) BCL type space with explicit pure / impure semantics baked into a updated type system. It's going to be really interesting to see what engineering choices they make in this space.

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    Stay tuned. Smiley

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    The hs-dotnet library is probably the closest to what you want, though it's not pretty.

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