[Open MPI Announce] Announcing Open MPI v4.0.0rc3

[Geoffrey Paulsen]

 

The Third release candidate for Open MPI v4.0.0 (rc3) has been built and is available at:

https://www.open-mpi.org/software/ompi/v4.0/

 

Only one News worth difference from v4.0.0rc2:
- Fix a problem with ORTE not reporting error messages if an application
  terminated normally but exited with non-zero error code. 

  Thanks to Emre Brookes for reporting

----

- 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.
- Removed support for SCIF.
- Improved CUDA support when using UCX.
- Enable use of CUDA allocated buffers for OMPIO.
- Improved support for two phase MPI I/O operations when using OMPIO.
- Added support for Software-based Performance Counters, see
  https://github.com/davideberius/ompi/wiki/How-to-Use-Software-Based-Performance-Counters-(SPCs)-in-Open-MPI
- 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.
- Fix a problem with ORTE not reporting error messages if an application terminated normally but exited with non-zero error code.  Thanks to Emre Brookes for reporting.

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