Hi All, Open MPI v4.0.6rc4 (we messed up and had to skip rc3) is now available at
https://www.open-mpi.org/software/ompi/v4.0/ Changes since the 4.0.5 release include: - Update embedded PMIx to 3.2.3. This update addresses several MPI_COMM_SPAWN problems. - Fix an issue with MPI_FILE_GET_BYTE_OFFSET when supplying a zero size file view. Thanks to @shanedsnyder for reporting. - Fix an issue with MPI_COMM_SPLIT_TYPE not observing key correctly. Thanks to Wolfgang Bangerth for reporting. - Fix a derived datatype issue that could lead to potential data corruption when using UCX. Thanks to @jayeshkrishna for reporting. - Fix a problem with shared memory transport file name collisions. Thanks to Moritz Kreutzer for reporting. - Fix a problem when using Flux PMI and UCX. Thanks to Sami Ilvonen for reporting and supplying a fix. - Fix a problem with MPIR breakpoint being compiled out using PGI compilers. Thanks to @louisespellacy-arm for reporting. - Fix some ROMIO issues when using Lustre. Thanks to Mark Dixon for reporting. - Fix a problem using an external PMIx 4 to build Open MPI 4.0.x. - Fix a compile problem when using the enable-timing configure option and UCX. Thanks to Jan Bierbaum for reporting. - Fix a symbol name collision when using the Cray compiler to build Open SHMEM. Thanks to Pak Lui for reporting and fixing. - Correct an issue encountered when building Open MPI under OSX Big Sur. Thanks to FX Coudert for reporting. - Various fixes to the OFI MTL. - Fix an issue with allocation of sufficient memory for parsing long environment variable values. Thanks to @zrss for reporting. - Improve reproducibility of builds to assist Open MPI packages. Thanks to Bernhard Wiedmann for bringing this to our attention. Your Open MPI release team.