This is an automated email from the git hooks/post-receive script. It was generated because a ref change was pushed to the repository containing the project "MPICH primary repository". The branch, master has been updated via c2417a7c15e7eef43d74bbef1ccc3d0915155cd8 (commit) from 1a5210ceec8b5ce1d23127dc7d27db430c57cbeb (commit) Those revisions listed above that are new to this repository have not appeared on any other notification email; so we list those revisions in full, below. - Log ----------------------------------------------------------------- http://git.mpich.org/mpich.git/commitdiff/c2417a7c15e7eef43d74bbef1ccc3d0915... commit c2417a7c15e7eef43d74bbef1ccc3d0915155cd8 Author: Pavan Balaji <[email protected]> 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(-) hooks/post-receive -- MPICH primary repository