[mpich-devel] MPICH 5.0.1rc2 released

Raffenetti, Ken raffenet at anl.gov
Wed Apr 1 10:15:15 CDT 2026


A new release candidate of MPICH, 5.0.1rc2, is now available for download. This release addresses several user-reported issues, including an accidental breakage of the standard ABI build (–enable-mpi-abi) present in 5.0.1rc1. For the full set of commits see https://urldefense.us/v3/__https://github.com/pmodels/mpich/compare/v5.0.0__;!!G_uCfscf7eWS!d9BeJ-ka3QrT_D3qHHB8b1kRL1YOiDpu9Wa_8SJ3m0IWESdaLtUB8-J0FvyeLj-F6vDqnZxBywzYcik$ …v5.0.1rc2/.

You can find the release on our downloads page (https://urldefense.us/v3/__https://www.mpich.org/downloads/__;!!G_uCfscf7eWS!d9BeJ-ka3QrT_D3qHHB8b1kRL1YOiDpu9Wa_8SJ3m0IWESdaLtUB8-J0FvyeLj-F6vDqnZxBwQIyWkY$ )

Regards,
The MPICH team

===============================================================================
                               Changes in 5.0.1
===============================================================================

# Fix bad cast in release-gather collectives that caused data loss
  issues on Big-Endian 64b arches (s390x)

# Fix issue with canceling MPI_ANY_SOURCE receive requests

# Fix configuration issue when C++ compiler does not support complex types

# Fix function signature issue in Hydra PBS support

# Fix crash in MPI_Allreduce with MPI_LOGICAL type

# Fix potential crash in multi-nic libfabric initialization

# Fix memory leaks in Level Zero and PMIx support

# Fix bug in CMA code when GPU support is enabled

# Add large count and other necessary aliases to ROMIO to avoid
  accidental profiling of internal MPI function usage

# Add missing error checks in rndv and colletive composition code

# Improve autogen.sh error message when autotools are too old
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