- Update to 4.2.2
- Update embedded libfabric to v1.20.1 and fix compilation with GCC 14.
- Fix dataloop support for MPIX_Type_iov routines
- Fix crash in Hydra when system has many local ip addresses
- Fix RMA fallback check in ch4:ofi netmod
- Fix MPI_UNDEFINED handling in mpi_f08 module
- Fix Slurm environment variable inheritance in Hydra
- Fix multiple issues with large count support in ROMIO
- Fix potential hang in init using PMIx client and nonstandard keys
- Fix crash if PMIx client cannot get appnum from server during init
- Fix other build errors and warnings
- Disable flat_namespace to build libmpifort on macOS by default
- Prefix warning messages with "MPICH"
- Add --disable-doc configure option
- Fix support for building MPICH Fortran support with Xcode 15 on macOS
- Fix bug in MPI_WIN_SHARED_QUERY when window is not shared
- Fix bug in ch4/ofi gpu pipelining
- Fixes for Intel GPU support
- Fix memory leak in ch4/shm collectives
- Fix bug in MPI_COMM_SPLIT with intercommunicators and non-zero root
- Fix bug in DAOS ROMIO driver
- Fix bug in cycling error code array
- Return an error if there is failure to create a datatype in mpi_f08
module for noncontiguous user data
- Return an error when shared memory segment creation fails
- Complete support MPI 4.1 specification
- Experimental thread communicator feature (e.g. MPIX_Threadcomm_init).
See paper "Frustrated With MPI+Threads? Try MPIxThreads!",
https://doi.org/10.1145/3615318.3615320.
- Experimental datatype functions MPIX_Type_iov_len and MPIX_Type_Iov