The first release candidate for the Open MPI v4.0.0 release is posted at
Major changes include:

4.0.0 -- September, 2018

- OSHMEM updated to the OpenSHMEM 1.4 API.
- Do not build Open SHMEM layer when there are no SPMLs available.
  Currently, this means the Open SHMEM layer will only build if
  a MXM or UCX library is found.
- A UCX BTL was added for enhanced MPI RMA support using UCX
- With this release,  OpenIB BTL now only supports iWarp and RoCE by default.
- Updated internal HWLOC to 2.0.1
- Updated internal PMIx to 3.0.1
- Change the priority for selecting external verses internal HWLOC
  and PMIx packages to build.  Starting with this release, configure
  by default selects available external HWLOC and PMIx packages over
  the internal ones.
- Updated internal ROMIO to 3.2.1.
- Removed support for the MXM MTL.
- Improved CUDA support when using UCX.
- Improved support for two phase MPI I/O operations when using OMPIO.
- Added support for Software-based Performance Counters, see Various improvements to MPI RMA performance when using RDMA
  capable interconnects.
- Update memkind component to use the memkind 1.6 public API.
- Fix problems with use of newer map-by mpirun options.  Thanks to
  Tony Reina for reporting.
- Fix rank-by algorithms to properly rank by object and span
- Allow for running as root of two environment variables are set.
  Requested by Axel Huebl.
- Fix a problem with building the Java bindings when using Java 10.
  Thanks to Bryce Glover for reporting.
Our goal is to release 4.0.0 by mid Oct, so any testing is appreciated.

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