[project @ 2003-07-03 14:33:18 by simonpj]

[ghc-hetmet.git] / ghc / docs / users_guide / parallel.sgml

diff --git a/ghc/docs/users_guide/parallel.sgml b/ghc/docs/users_guide/parallel.sgml
index 242b87a..9a6502a 100644 (file)
--- a/ghc/docs/users_guide/parallel.sgml
+++ b/ghc/docs/users_guide/parallel.sgml
@@ -43,6 +43,7 @@ sequential execution, then fine.
 <Para>
 A Parallel Haskell program implies multiple processes running on
 multiple processors, under a PVM (Parallel Virtual Machine) framework.
+An MPI interface is under development but not fully functional, yet.
 </Para>
 
 <Para>
@@ -51,13 +52,18 @@ fun&rdquo; than about &ldquo;speed.&rdquo; That will change.
 </Para>
 
 <Para>
-Again, check Simon's Web page for publications about Parallel Haskell
-(including &ldquo;GUM&rdquo;, the key bits of the runtime system).
+Check the <ULink URL="http://www.cee.hw.ac.uk/~dsg/gph/">GPH Page</Ulink>
+for more information on &ldquo;GPH&rdquo; (Haskell98 with extensions for
+parallel execution), the latest version of &ldquo;GUM&rdquo; (the runtime
+system to enable parallel executions) and papers on research issues.  A
+list of publications about GPH and about GUM is also available from Simon's
+Web Page.
 </Para>
 
 <Para>
 Some details about Parallel Haskell follow.  For more information
-about concurrent Haskell, see <xref linkend="sec-Concurrent">.
+about concurrent Haskell, see the module
+<literal>Control.Concurrent</literal> in the library documentation.
 </Para>
 
 <Sect2>
@@ -152,9 +158,9 @@ you'd like to see this with your very own eyes, just run GHC with the
 </Sect3>
 
 <Sect3>
-<Title>Scheduling policy for concurrent/parallel threads
-<IndexTerm><Primary>Scheduling&mdash;concurrent/parallel</Primary></IndexTerm>
-<IndexTerm><Primary>Concurrent/parallel scheduling</Primary></IndexTerm></Title>
+<Title>Scheduling policy for concurrent threads
+<IndexTerm><Primary>Scheduling&mdash;concurrent</Primary></IndexTerm>
+<IndexTerm><Primary>Concurrent scheduling</Primary></IndexTerm></Title>
 
 <Para>
 Runnable threads are scheduled in round-robin fashion.  Context
@@ -179,6 +185,26 @@ of the currently active threads are completed.
 
 </Sect3>
 
+<Sect3>
+<Title>Scheduling policy for parallel threads
+<IndexTerm><Primary>Scheduling&mdash;parallel</Primary></IndexTerm>
+<IndexTerm><Primary>Parallel scheduling</Primary></IndexTerm></Title>
+
+<Para>
+In GUM we use an unfair scheduler, which means that a thread continues to
+perform graph reduction until it blocks on a closure under evaluation, on a
+remote closure or until the thread finishes. 
+</Para>
+ 
+</Sect3>
+
 </Sect2>
 
 </Sect1>
+
+<!-- Emacs stuff:
+     ;;; Local Variables: ***
+     ;;; mode: sgml ***
+     ;;; sgml-parent-document: ("users_guide.sgml" "book" "chapter" "sect1") ***
+     ;;; End: ***
+ -->