Release Notes: Fixes mpirun --launch-agent behavior when a prefix is specified. Fixes memchecker configury. Fixes spawning from a singleton to multiple hosts when the "add-host" MPI_Info key is used. Adds Mellanox ConnextIB IDs and max inline value. Fixes rankfile when no -np is given. FreeBSD detection improvement. Removal of TCP warnings on Windows. Improved collective algorithm selection for very large messages. Fixes PSM MTL affinity settings. Fixes an issue with MPI_OP_COMMUTATIVE in the mpif.h bindings. Fixes an issue with MPI_SIZEOF when using CHARACTER and LOGICAL types in the MPI module.
Release Notes: Process affinity is now used by default. Support was provided for all remaining MPI-3 functionality except MPI-3 one-sided semantics: all remaining non-blocking collectives, neighborhood collectives, const and  array notation, non-blocking communicator duplication, and non-collective communicator creation. SCIF communication support with the Intel Phi was added. New Java MPI bindings were provided. Bugs in the mpi_f08 module were fixed. A newer version of ROMIO is used. Many, many small bugs were fixed across the code base.
Release Notes: Improvements to Torque, SLURM, and CUDA support, various Solaris fixes, full support for MPI 2.2, fixed MPI_IS_THREAD_MAIN behavior, various rank file fixes, fixed iWARP support, and MPI-3 support for MPI_Count and MPI_T control and performance variables. Support for ancient OS X systems was dropped. An obscure pack/unpack datatype bug was fixed. PMI2 support was added.
Release Notes: Many bugs fixed in version 1.6.5 were forwarded-ported. This release integrated MXM STREAM support for MPI_ISEND and MPI_RECV, added PCI device distance mapping, fixed parallel debugger attachment functionality, fixed datatype corruption when combining certain datatypes, added Location Aware Mapping Algorithm (LAMA) for process affinity support, and fixed MPI_STATUS handling in obscure cases.
Release Notes: A compilation error when --without-memory-manager was specified was fixed along with an XRC compile issue in OpenFabrics support.
Release Notes: This release added much new MPI-3 functionality: matched probe, MPI_TYPE_CREATE_HINDEXED_BLOCK, non-blocking collectives, Fortran '08 bindings, MPI_INFO_ENV, and MPI_GET_LIBRARY_VERSION. Compile-time warning of deprecated functions was enabled. Various performance improvements were made throughout the codebase. MPI_TYPE_CREATE_F90_REAL was fixed. Many MXM and FCA updates were made. The run-time support layer. was revamped. Windows and checkpoint/restart support was dropped. MPI collective performance was improved.