[mpich-announce] Announcing the availability of mpich-3.1

Balaji, Pavan balaji at mcs.anl.gov
Thu Feb 20 13:43:02 CST 2014

The MPICH team is pleased to announce the availability of a new stable
release (mpich-3.1).

This is a new major release that adds several capabilities including full
binary (ABI) compatibility with Intel MPI 5.0, an integrated MPICH-PAMID
code base for IBM BG/Q (contributed by IBM), several improvements to Intel
Xeon Phi (contributed by Intel and NEC), a major revamp of the MPI_T tools
interface, large improvements to one-sided communication in shared memory
environments, a number of improvements to mpiexec process binding
capabilities, various improvements to the support of large counts (more
than 2GB data), and a large number of bug fixes.

All production environments are encouraged to upgrade to this release.

More information about the release can be found on the MPICH website:


A list of changes in this release is included at the end of this email.


The MPICH Team

				Changes in 3.1

 # Implement runtime compatibility with MPICH-derived implementations as
   the ABI Compatibility Initiative (see www.mpich.org/abi for more

 # Integrated MPICH-PAMI code base for Blue Gene/Q and other IBM

 # Several improvements to the SCIF netmod.  (code contribution from

 # Major revamp of the MPI_T interface added in MPI-3.

 # Added environment variables to control a lot more capabilities for
   collectives.  See the README.envvar file for more information.

 # Allow non-blocking collectives and fault tolerance at the same
   time. The option MPIR_PARAM_ENABLE_COLL_FT_RET has been deprecated as
   it is no longer necessary.

 # Improvements to MPI_WIN_ALLOCATE to internally allocate shared
   memory between processes on the same node.

 # Performance improvements for MPI RMA operations on shared memory

 # Enable shared library builds by default.

 # Upgraded hwloc to 1.8.

 # Several improvements to the Hydra-SLURM integration.

 # Several improvements to the Hydra process binding code.  See the
   Hydra wiki page for more information:

 # MPICH now supports operations on very large datatypes (those that
   more than 32 bits of data).  This work also allows MPICH to fully
   MPI-3's introduction of MPI_Count.

 # Several other minor bug fixes, memory leak fixes, and code cleanup.

   A full list of changes is available at the following link:


   A full list of bugs that have been fixed is available at the
   following link:


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