X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=docs%2Fusers_guide%2Fparallel.xml;h=76d38dc6464031ed61928a6df316d172f81d5361;hb=d5ab3b5e415ebdff8906dcac3451e7448d6bdb11;hp=3d14622cf15ed723db881025d3ad1cfcb4d3e206;hpb=bd45ccd370162016fef7d0b4dec3518119ab392c;p=ghc-hetmet.git diff --git a/docs/users_guide/parallel.xml b/docs/users_guide/parallel.xml index 3d14622..76d38dc 100644 --- a/docs/users_guide/parallel.xml +++ b/docs/users_guide/parallel.xml @@ -5,7 +5,7 @@ GHC implements some major extensions to Haskell to support - concurrent and parallel programming. Let us first etablish terminology: + concurrent and parallel programming. Let us first establish terminology: Parallelism means running a Haskell program on multiple processors, with the goal of improving @@ -33,7 +33,7 @@ url="http://research.microsoft.com/copyright/accept.asp?path=/users/simonpj/papers/concurrent-haskell.ps.gz"> Concurrent Haskell paper is still an excellent resource, as is Tackling + url="http://research.microsoft.com/%7Esimonpj/papers/marktoberdorf/">Tackling the awkward squad. To the programmer, Concurrent Haskell introduces no new language constructs; @@ -83,7 +83,7 @@ All these features are described in the papers mentioned earlier. By default GHC runs your program on one processor; if you want it to run in parallel you must link your program with the , and run it with the RTS - option; see ). + option; see ). The runtime will schedule the running Haskell threads among the available OS threads, running as many in parallel as you specified with the @@ -110,7 +110,7 @@ All these features are described in the papers mentioned earlier. linkend="concurrent-haskell"/>), but the simplest mechanism for extracting parallelism from pure code is to use the par combinator, which is closely related to (and often used with) seq. Both of these are available from Control.Parallel: + url="../libraries/parallel/Control-Parallel.html">Control.Parallel: infixr 0 `par` @@ -163,12 +163,20 @@ nfib n | n <= 1 = 1 More sophisticated combinators for expressing parallelism are available from the Control.Parallel.Strategies module. + url="../libraries/parallel/Control-Parallel-Strategies.html">Control.Parallel.Strategies module. This module builds functionality around par, expressing more elaborate patterns of parallel computation, such as parallel map. +Data Parallel Haskell + GHC includes experimental support for Data Parallel Haskell (DPH). This code + is highly unstable and is only provided as a technology preview. More + information can be found on the corresponding DPH + wiki page. + +