Changes between Version 21 and Version 22 of Status/May11
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 Apr 29, 2011 8:54:47 AM (3 years ago)
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Status/May11
v21 v22 7 7 * In the autumn, Dimitrios and Simon PJ implemented a completely 8 8 new constraint solver for the type checker; we also complete an 9 epic JFP paper describing how it works [[http://research.microsoft.com/ enus/um/people/simonpj/papers/constraints/ OutsideIn]]. The new9 epic JFP paper describing how it works [[http://research.microsoft.com/~simonpj/papers/constraints/ OutsideIn]]. The new 10 10 solver is far more tractable and maintainable than the old type 11 11 checker, and has fixed many outstanding problems. We are still … … 28 28 Core had to grow a little. For a few 29 29 years we have been using an extension of System F, called System 30 FC, as described in our 2007 paper [[http://research.microsoft.com/ enus/um/people/simonpj/papers/extf/ FC]]. However, the way that System FC30 FC, as described in our 2007 paper [[http://research.microsoft.com/~simonpj/papers/extf/ FC]]. However, the way that System FC 31 31 was actually ''implemented'' in GHC's Core language was a bit unsatisfactory 32 32 so, with help from '''Brent Yorgey''', Simon PJ is busy reengineering it. … … 35 35 squeezed into `Type`. Moreover, these coercion terms can get big, 36 36 so there's a new "coercion optimiser" to replace big coercions by 37 equivalent smaller ones. All this is described in our new paper [http://research.microsoft.com/ enus/um/people/simonpj/papers/extf/ NewFC].37 equivalent smaller ones. All this is described in our new paper [http://research.microsoft.com/~simonpj/papers/extf/ NewFC]. 38 38 These changes will (finally) complete the typefamily story by 39 39 making socalled "equality superclasses" work for the first time in GHC 7.2. … … 46 46 code generation backend (`fusenewcodegen`, the rewrite of 47 47 the part of GHC that turns STG syntax into C). Hoopl is now 48 fully part of GHC [[http://research.microsoft.com/ enus/um/people/simonpj/papers/c/ Hoopl]], and the new path uses it extensively; we’ve48 fully part of GHC [[http://research.microsoft.com/~simonpj/papers/c/ Hoopl]], and the new path uses it extensively; we’ve 49 49 ironed out most of the bugs in the backend; and now we’re 50 50 working on new optimization passes and fixing inefficiencies to … … 54 54 Stay tuned. 55 55 56 * Simon Marlow and '''Ryan Newton''' have developed a neat new library for deterministic parallel progarmming in Haskell; read their ICFP submission [[http://research.microsoft.com/ enus/um/people/simonpj/papers/parallel/ DetPar]]. The model is monadic and has explicit control over granularity, but allows dynamic construction of dataflow networks that are scheduled at runtime, while remaining deterministic and pure.56 * Simon Marlow and '''Ryan Newton''' have developed a neat new library for deterministic parallel progarmming in Haskell; read their ICFP submission [[http://research.microsoft.com/~simonpj/papers/parallel/ DetPar]]. The model is monadic and has explicit control over granularity, but allows dynamic construction of dataflow networks that are scheduled at runtime, while remaining deterministic and pure. 57 57 58 58 * '''Simon Marlow: any update?''' Previous entry: ''Simon Marlow is working on a new garbage collector that is designed to improve scaling of parallel programs beyond small numbers of cores, by allowing each processor core to collect its own local heap independently of the other cores. Some encouraging preliminary results were reported in a [http://hackage.haskell.org/trac/ghc/blog/2010/9#newgcpreview blog post]. Work on this continues; the complexity of the system and the number of interacting design choices means that achieving an implementation that works well in a broad variety of situations is proving to be quite a challenge.'' … … 85 85 Here's a selection that we know about. 86 86 87 * '''Jeff Epstein''', in collaboration with Andrew Black, has implemented a library that brings Erlang's programming model to Haskell programmers. In particular, you can write a Haskell program that runs on a cluster of machines that do not share memory. It is all based on a modest but powerful language extension that makes it possible for a programmer to work with "static" functions; that is, ones consisting of pure code with no free variables. The paper that describes all this is called "Haskell for the cloud" [[http://research.microsoft.com/ enus/um/people/simonpj/papers/parallel/ Cloud]].87 * '''Jeff Epstein''', in collaboration with Andrew Black, has implemented a library that brings Erlang's programming model to Haskell programmers. In particular, you can write a Haskell program that runs on a cluster of machines that do not share memory. It is all based on a modest but powerful language extension that makes it possible for a programmer to work with "static" functions; that is, ones consisting of pure code with no free variables. The paper that describes all this is called "Haskell for the cloud" [[http://research.microsoft.com/~simonpj/papers/parallel/ Cloud]]. 88 88 89 * '''Max Bolingbroke''' continues his !PhD work on supercompilation, with a nice new paper [[http://research.microsoft.com/ enus/um/people/simonpj/papers/supercompilation/ ImprovingSupercompilation]]. The plan is to make his supercompiler part of GHC, over the next year or so.89 * '''Max Bolingbroke''' continues his !PhD work on supercompilation, with a nice new paper [[http://research.microsoft.com/~simonpj/papers/supercompilation/ ImprovingSupercompilation]]. The plan is to make his supercompiler part of GHC, over the next year or so. 90 90 91 91 * ''David Mazieres at Stanford wants to implement '''Safe Haskell''', a flag for GHC that will guarantee that your program does not use `unsafePerformIO`, foreign calls, RULES, and other stuff stuff.'' … … 113 113 == Bibliography == 114 114 115 * [Cloud] "Haskell for the cloud", Epstein, Black, Peyton Jones, submitted to ICFP 2011, http://research.microsoft.com/ enus/um/people/simonpj/papers/parallel/115 * [Cloud] "Haskell for the cloud", Epstein, Black, Peyton Jones, submitted to ICFP 2011, http://research.microsoft.com/~simonpj/papers/parallel/ 116 116 117 117 * [Derivable] "A generic deriving mechanism for Haskell", Magalhães, Dijkstra, Jeuring and Löh, Haskell Symposium 2010, http://www.dreixel.net/research/pdf/gdmh_nocolor.pdf. 118 118 119 * [!DetPar] "A monad for deterministic parallelism", Marlow, Newton, and Peyton Jones, submitted to ICFP 2011, http://research.microsoft.com/ enus/um/people/simonpj/papers/parallel/119 * [!DetPar] "A monad for deterministic parallelism", Marlow, Newton, and Peyton Jones, submitted to ICFP 2011, http://research.microsoft.com/~simonpj/papers/parallel/ 120 120 121 * [FC] "System F with type equality coercions", Sulzmann, Chakravarty, Peyton Jones, TLDI 2007, http://research.microsoft.com/ enus/um/people/simonpj/papers/extf/121 * [FC] "System F with type equality coercions", Sulzmann, Chakravarty, Peyton Jones, TLDI 2007, http://research.microsoft.com/~simonpj/papers/extf/ 122 122 123 * [Hoopl] "A modular, reusable library for dataflow analysis and transformation", Dias, Ramsey, and Peyton Jones, Haskell Symposium 2010, http://research.microsoft.com/ enus/um/people/simonpj/papers/c/123 * [Hoopl] "A modular, reusable library for dataflow analysis and transformation", Dias, Ramsey, and Peyton Jones, Haskell Symposium 2010, http://research.microsoft.com/~simonpj/papers/c/ 124 124 125 * [!ImprovingSupercompilation] "Improving supercompilation: tagbags, rollback, speculation, normalisation, and generalisation", Bolingbroke and Peyton Jones, submitted to ICFP 2011, http://research.microsoft.com/ enus/um/people/simonpj/papers/supercompilation/125 * [!ImprovingSupercompilation] "Improving supercompilation: tagbags, rollback, speculation, normalisation, and generalisation", Bolingbroke and Peyton Jones, submitted to ICFP 2011, http://research.microsoft.com/~simonpj/papers/supercompilation/ 126 126 127 * [NewFC] "Practical aspects of evidencebased compilation in System FC", Vytiniotis and Peyton Jones, submitted to ICFP 2011, http://research.microsoft.com/ enus/um/people/simonpj/papers/extf/127 * [NewFC] "Practical aspects of evidencebased compilation in System FC", Vytiniotis and Peyton Jones, submitted to ICFP 2011, http://research.microsoft.com/~simonpj/papers/extf/ 128 128 129 * [!OutsideIn] "Modular type inference iwth local assumptions", Vytiniotis, Peyton Jones, Schrijvers, and Sulzmann, Journal of Functional Programming (to appear), http://research.microsoft.com/ enus/um/people/simonpj/papers/constraints/129 * [!OutsideIn] "Modular type inference iwth local assumptions", Vytiniotis, Peyton Jones, Schrijvers, and Sulzmann, Journal of Functional Programming (to appear), http://research.microsoft.com/~simonpj/papers/constraints/ 130 130 131 131 * [!ParallelGhcProject] "The Parallel GHC Project home page", http://www.haskell.org/haskellwiki/Parallel_GHC_Project 132 132 133 * [Repa] "Regular, shapepolymorphic parallel arrays in Haskell", Keller, Chakravarty, Leshchinskiy, Peyton Jones, and Lippmeier, ICFP 2010. Paper: http://research.microsoft.com/ enus/um/people/simonpj/papers/ndp/, Hackage package: http://hackage.haskell.org/package/repa133 * [Repa] "Regular, shapepolymorphic parallel arrays in Haskell", Keller, Chakravarty, Leshchinskiy, Peyton Jones, and Lippmeier, ICFP 2010. Paper: http://research.microsoft.com/~simonpj/papers/ndp/, Hackage package: http://hackage.haskell.org/package/repa 134 134 135 135 * [SHE] The Strathclyde Haskell Enhancement, Conor !McBride, 2010, http://personal.cis.strath.ac.uk/~conor/pub/she/