The MPICH team is pleased to announce the availability of a new preview release (mpich-3.1rc4). This is a release candidate of the upcoming MPICH 3.1, and adds several capabilities including a fully integrated source for vanilla MPICH and the IBM PE/BG device, several improvements for the Intel Xeon Phi architecture, improved support for fault tolerance, improvements to MPI RMA for shared memory communication, MPI large count 64-bit safety, and MPI Tools interface improvements. This release also fixes several bugs present in 3.0.4. 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 3.1rc4 =============================================================================== # 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. # 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..v3.1rc4 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&m...