v1.8.3 is a bug fix release. All users are encouraged to upgrade to v1.8.3 when possible.

Here is a list of changes in v1.8.3 as compared to v1.8.2:

• Fixed application abort bug to ensure that MPI_Abort exits appropriately and returns the provided exit status
• Fixed some alignment (not all) issues identified by Clang
• Allow CUDA-aware to work with nonblocking collectives. Forces packing to happen when using GPU buffers.
• Fixed configure test issue with Intel 2015 Fortran compiler
• Fixed some PGI-related errors
• Provide better help message when encountering a firewall
• Fixed MCA parameter quoting to protect multi-word params and params that contain special characters
• Improved the bind-to help message to clarify the defaults
• Add new MPI-3.1 tools interface
• Several performance optimizations and memory leak cleanups
• Turn off the coll/ml plugin unless specifically requested as it remains in an experimental state
• Fix LSF support by adding required libraries for the latest LSF releases. Thanks to Joshua Randal for supplying the initial patches.