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: http://www.mpich.org A list of changes in this release is included at the end of this email. Regards, The MPICH Team =========================================================================== ==== Changes in 3.1 =========================================================================== ==== # Implement runtime compatibility with MPICH-derived implementations as per the ABI Compatibility Initiative (see www.mpich.org/abi for more information). # Integrated MPICH-PAMI code base for Blue Gene/Q and other IBM platforms. # Several improvements to the SCIF netmod. (code contribution from Intel). # 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 for MPI_WIN_ALLOCATE and MPI_WIN_ALLOCATE_SHARED. # 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: http://wiki.mpich.org/mpich/index.php/Using_the_Hydra_Process_Manager # MPICH now supports operations on very large datatypes (those that describe more than 32 bits of data). This work also allows MPICH to fully support 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: http://git.mpich.org/mpich.git/shortlog/v3.0.4..v3.1 A full list of bugs that have been fixed is available at the following link: https://trac.mpich.org/projects/mpich/query?status=closed&group=resolution& milestone=mpich-3.1