[mpich-commits] [mpich] MPICH primary repository branch, master, updated. v3.0.4-299-gc2417a7

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http://git.mpich.org/mpich.git/commitdiff/c2417a7c15e7eef43d74bbef1ccc3d0915155cd8

commit c2417a7c15e7eef43d74bbef1ccc3d0915155cd8
Author: Pavan Balaji <balaji at mcs.anl.gov>
Date:   Sun Jun 9 21:02:56 2013 -0500

    Improved README text for ASYNC_PROGRESS.

diff --git a/src/util/param/params.yml b/src/util/param/params.yml
index 968a14a..d5f4300 100644
--- a/src/util/param/params.yml
+++ b/src/util/param/params.yml
@@ -367,7 +367,12 @@ parameters:
         I/O.  Setting this variable will automatically increase the
         thread-safety level to MPI_THREAD_MULTIPLE.  While this
         improves the progress semantics, it might cause a small amount
-        of performance overhead for regular MPI operations.
+        of performance overhead for regular MPI operations.  The user
+        is encouraged to leave one or more hardware threads vacant in
+        order to prevent contention between the application threads
+        and the progress thread(s).  The impact of oversubscription is
+        highly system dependent but may be substantial in some cases,
+        hence this recommendation.
 
     - category    : threads
       name        : DEFAULT_THREAD_LEVEL

-----------------------------------------------------------------------

Summary of changes:
 src/util/param/params.yml |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)


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