The first release candidate for the Open MPI v4.0.1 release is posted at https://www.open-mpi.org/software/ompi/v4.0/
Major changes include: - Update embedded PMIx to 3.1.2. - Fix an issue when using --enable-visibility configure option and older versions of hwloc. Thanks to Ben Menadue for reporting and providing a fix. - Fix an issue with MPI_WIN_CREATE_DYNAMIC and MPI_GET from self. thanks to Bart Janssens for reporting. - Fix an issue of excessive compiler warning messages from mpi.h when using newer C++ compilers. Thanks to @Shadow-fax for reporting. - Fix a problem when building Open MPI using clang 5.0. - Fix a problem with MPI_WIN_CREATE when using UCX. Thanks to Adam Simpson for reporting. - Fix a memory leak encountered for certain MPI datatype destructor operations. Thanks to Axel Huebl for reporting. - Fix several problems with MPI RMA accumulate operations. Thanks to Jeff Hammond for reporting. - Fix possible race condition in closing some file descriptors during job launch using mpirun. Thanks to Jason Williams for reporting and providing a fix. - Fix a problem in OMPIO for large individual write operations. Thanks to Axel Huebl for reporting. - Fix a problem with parsing of map-by ppr options to mpirun. Thanks to David Rich for reporting. - Fix a problem observed when using the mpool hugepage component. Thanks to Hunter Easterday for reporting and fixing. - Fix valgrind warning generated when invoking certain MPI Fortran data type creation functions. Thanks to @rtoijala for reporting. - Fix a problem when trying to build with a PMIX 3.1 or newer release. Thanks to Alastair McKinstry for reporting. - Fix a problem encountered with building MPI F08 module files. Thanks to Igor Andriyash and Axel Huebl for reporting. - Fix two memory leaks encountered for certain MPI-RMA usage patterns. Thanks to Joseph Schuchart for reporting and fixing. - Fix a problem with the ORTE rmaps_base_oversubscribe MCA paramater. Thanks to @iassiour for reporting. - Fix a problem with UCX PML default error handler for MPI communicators. Thanks to Marcin Krotkiewski for reporting. - Fix various issues with OMPIO uncovered by the testmpio test suite. Our goal is to release 4.0.1 by mid March, so any testing is appreciated. Thanks, your Open MPI release team
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