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MPICH 5.0.0rc2 Released
by Zhou, Hui 10 Jan '26

10 Jan '26

We are pleased to announce the availability of MPICH version 5.0.0rc2. Compared to the 5.0.0rc1 release, this release contains a fix for potential build issues on macOS. The release tarball is available in the MPICH download<https://urldefense.us/v3/__https://www.mpich.org/downloads__;!!G_uCfscf7eWS… > area. We encourage users to test this release and report any issues. Thank you for your continued support. The MPICH Team

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Releasing MPICH-5.0.0rc1
by Zhou, Hui 19 Dec '25

19 Dec '25

We are happy to announce that we just released MPICH-5.0.0rc1. This is the first release candidate for MPICH-5.0.0. It contains some bug fixes and improvements since MPICH-5.0.0b1. See the list of changes below. The release tarball can be found on our downloads page (https://urldefense.us/v3/__https://www.mpich.org/downloads__;!!G_uCfscf7eWS… ). Please test. List of changes since v5.0.0b1: yaksa: fix automatic compilation for CUDA 13 ch4: shm: fix data type for recv_bytes in MPIDI_POSIX_mpi_release_gat… abi: fix MPI_Abi_get_fortran_info yaksa: update to sync-up with yaksa repo ch4: use larger initial av_tables size autogen: pre-run libtoolize if necessary ch4/win: refactor win_shm_alloc_impl hydra: do not use -lhydra to link build: miscellaneous configure and build issues Fix data races found by ThreadSanitizer cma: fix CMA detection makefile: fix missing semicolon in `uninstall-local` abi: do not convert builtin handles in _{from,to}int hydra: fix standalone build on MacOS ch4/progress: fine-tune progress throttle init: add commit hash to DEBUG_SUMMARY misc: ci warnings rollup common/genq: fix false sharing and alignment issue in shared pool misc: fine tune default fast copy threshold -- Hui Zhou on behalf of MPICH Team

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Join us for the MPICH BoF Wednesday evening at SC25
by Raffenetti, Ken 13 Nov '25

13 Nov '25

All, The MPICH team will host a Birds-of-a-Feather session Wednesday evening as part of the SC25 proceedings. We hope you will join us to discuss the latest MPICH developments and hear from the community. Date and Time: Wednesday, November 19th, 5:15pm - 6:45pm CST Location: 125 Agenda: * Welcome and ANL Update * Welcome – Ken Raffenetti * ANL Update – Yanfei Guo & Hui Zhou * Partner Presentations * Maria Garzaran, Intel * Nathaniel Shineman, MVAPICH * Simon Pickartz, ParTec AG * Naveen Ravi, HPE * Jeff Hammond, NVIDIA * Mike Wilkins, Cornelis Networks * User Presentations * Thomas Applencourt, ANL/ALCF * Q&A https://urldefense.us/v3/__https://sc25.conference-program.com/presentation… Cheers, The MPICH team

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MPICH 5.0.0b1 Released
by Zhou, Hui 07 Nov '25

07 Nov '25

We are happy to announce the release of MPICH 5.0.0b1! Please test and feedback. This is the first beta release for the MPICH 5.0.x release cycle. Major features added in this release include: * Full support for MPI 5.0 standard including the support for MPI ABI * Support true MPI sessions * Internal datatypes for mapping builtin MPI datatypes * CH4:OFI native RNDV mode The release tarball can be found on our downloads page. For the full set of commits see https://urldefense.us/v3/__https://github.com/pmodels/mpich/compare/v4.3.2_… …v5.0.0b1/. Following is the complete CHANGELOG: =============================================================================== Changes in 5.0 =============================================================================== # MPI_VERSION/MPI_SUBVERSION updated to 5 and 0. MPICH now supports the MPI 5.0 standard. # MPIR_CHKLMEM_ and MPIR_CHKPMEM_ macros are simplified, removing non-essential argument such as type case and custom error messages. # Rename MPIR_CVAR_DEBUG_PROGRESS_TIMEOUT to MPIR_CVAR_PROGRESS_TIMEOUT, and enable it whether or not --enable-g=progress is used in configure. # MPICH now generates the MPI-IO bindings when ROMIO is build inside MPICH. It remains the same for using ROMIO outside MPICH. # Yaksa is now maintained inside MPICH rather than as an external submodule. # Added internal builtin datatypes and external builtin datatypes are mapped to internal types. For example, both MPI_INT and MPI_INT32_T are mapped to internal type MPIR_INT32. NOTE: direct usage of external MPI types are disallowed in MPICH internally. For example, use MPIR_INT_INTERNAL to replace direct usage of MPI_INT. Commonly used types include MPI_BYTE, MPI_CHAR, MPI_AINT, use MPIR_BYTE_INTERNAL, MPIR_CHAR_INTERNAL, MPIR_AINT_INTERNAL instead. There is no impact to users. # Removed MPIR_Find_{local,external}. Added in MPIR_Comm struct with attr and hierarchical fields to more efficiently query communicator's hierarchical structure. # Use MPIR_Comm_get_{node,node_roots}_comm to obtain node_comm and node_roots_comm. This provides the mechanism to create subcomms on demand. In general, use MPIR_Subcomm_create to create subcomms. Subcomms are marked by MPIR_COMM_ATTR__SUBCOMM bit in the attr field. They can be much more lightweight than user-visible communicators. # ADI: MPID_Comm_get_lpid removed. Lpids are looked up from the local_group and remote_group in the MPIR_Comm struct. # ADI: MPID_Intercomm_exchange_map renamed to MPID_Intercomm_exchange and parameters now include tag, context_id, and will perform context_id exchange and lpid exchange. # Added MPI_LOGICAL1, MPI_LOGICAL2, MPI_LOGICAL4, MPI_LOGICAL8, and MPI_LOGICAL16. # Added MPIX_BFLOAT16, and added software reduction support for MPIX_BFLOAT16 and MPIX_C_FLOAT16. # Reworked AVX and AVX512 support. By default, MPICH will use runtime check to detect if AVX or AVX512 is supported. If supported, MPICH will internally use AVX and AVX512 for inter-NUMA and Intel GPU device memory copy operations. The --enable-fast=avx and --enable-fast=avx512f options now does two things: 1) skips the runtime check and force enables AVX and AVX512; 2) enables the usage of AVX and AVX512 to build the entire libmpi.so (instead of selected memory copy operations). A new summary in ./configure will report info on these usages. # PMI 2 is now deprecated. Please consider switching to PMI 1. # PMI 2 thread support is removed. # PMI 1 upgraded to PMI 1.2, adding new API PMI_Barrier_group. PMI_Barrier_group support KVS exchange and barrier over a group of processes rather than the world. Usage in multiple threads is supported. # MPI_Session_init default to MPI_THREAD_MULTIPLE. Thread levels are global. The first MPI_Session_init, MPI_Init, or MPI_Init_thread sets the thread level; the later init will ignore users request and inherit the global thread level. # Internal collective interface replaces the last parameter "MPIR_Errflag_t errflag" with "int coll_attr". Use MPIR_COLL_ATTR_SYNC for internal collective usages where completing the synchronization is more critical than batch latency. # CH4:OFI added native RNDV feature. Set MPIR_CVAR_CH4_OFI_EAGER_THRESHOLD to enable the RNDV path. The RNDV path supports the following protocols: pipeline, read, write, and direct. -- The MPICH Team

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MPICH 4.3.2 released
by Raffenetti, Ken 06 Oct '25

06 Oct '25

A new stable release of MPICH, 4.3.2, is now available for download. Thanks to everyone who contributed to the release! See CHANGES below for a detailed list of fixes. You can find the release on our downloads page (https://urldefense.us/v3/__https://www.mpich.org/downloads/__;!!G_uCfscf7eW… ) Regards, The MPICH team =============================================================================== Changes in 4.3.2 =============================================================================== # Improve libfabric provider selection when available providers have negative internal score # Improve error messages when Level Zero failures are detected # Improve localhost detection in Hydra # Update libfabric usage to silence deprecation warnings # Update yaksa for improved reproducibility in code generation # Update embedded UCX to v1.19.0 # Update embedded libfabric to fix build issue with GCC 15 # Add compatibility with CUDA 13 # Fix missing const in nondestructive request test and status query functions # Fix HCOLL support # Fix crash with GPU-aware build when running on systems with no GPUs # Fix HIP device query # Fix singleton init with Hydra # Fix thread safety for Level Zero memcpy functions # Fix potential crash when release gather collective initialization fails # Fix ch3 connect/accept protocol handling when a discard event arrives after a connection is already established # Fix inlining for posix eager modules in ch4/shm # Fix weak attribute usage in MPI ABI build # Fix potential use-after-free bug in Hydra during spawn operations # Fix bug in persistent bcast algorithm # Fix bug in fabric coordinate retrieval with PMIx # Fix integer overflow and signed/unsigned bugs in ROMIO # Fix Quobtye ROMIO driver build error # Fix broken string conversion in mpi_f08 module # Fix compilation issue with mpi_f08 and NAG compiler # Fixes for various test program bugs

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MPICH 4.3.2rc2 released
by Raffenetti, Ken 25 Sep '25

25 Sep '25

A new stable release candidate of MPICH, 4.3.2rc2, is now available for download. See the CHANGES below for a detailed list of fixes. Since rc1, there are added fixes for NAG Fortran compilers, HIP GPU support, and the standard MPI ABI (experimental). At this stage, only critical bugs will be fixed before the 4.3.2 GA release. Please give it a try! You can find the release on our downloads page (https://urldefense.us/v3/__https://www.mpich.org/downloads/__;!!G_uCfscf7eW… ) Regards, The MPICH team =============================================================================== Changes in 4.3.2 =============================================================================== # Improve libfabric provider selection when available providers have negative internal score # Improve error messages when Level Zero failures are detected # Improve localhost detection in Hydra # Update libfabric usage to silence deprecation warnings # Update yaksa for improved reproducibility in code generation # Update embedded UCX to v1.19.0 # Update embedded libfabric to fix build issue with GCC 15 # Add compatibility with CUDA 13 # Fix missing const in nondestructive request test and status query functions # Fix HCOLL support # Fix crash with GPU-aware build when running on systems with no GPUs # Fix HIP device query # Fix singleton init with Hydra # Fix thread safety for Level Zero memcpy functions # Fix potential crash when release gather collective initialization fails # Fix ch3 connect/accept protocol handling when a discard event arrives after a connection is already established # Fix inlining for posix eager modules in ch4/shm # Fix weak attribute usage in MPI ABI build # Fix potential use-after-free bug in Hydra during spawn operations # Fix bug in persistent bcast algorithm # Fix bug in fabric coordinate retrieval with PMIx # Fix integer overflow and signed/unsigned bugs in ROMIO # Fix Quobtye ROMIO driver build error # Fix broken string conversion in mpi_f08 module # Fix compilation issue with mpi_f08 and NAG compiler # Fixes for various test program bugs

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MPICH 4.3.2rc1 released
by Raffenetti, Ken 23 Sep '25

23 Sep '25

A new stable release candidate of MPICH, 4.3.2rc1, is now available for download. See the CHANGES below for a detailed list of fixes. At this stage, only critical bugs will be fixed before the 4.3.2 GA release. Please give it a try! You can find the release on our downloads page (https://urldefense.us/v3/__https://www.mpich.org/downloads/__;!!G_uCfscf7eW… ) Regards, The MPICH team =============================================================================== Changes in 4.3.2 =============================================================================== # Improve libfabric provider selection when available providers have negative internal score # Improve error messages when Level Zero failures are detected # Improve localhost detection in Hydra # Update libfabric usage to silence deprecation warnings # Update yaksa for improved reproducibility in code generation # Update embedded UCX to v1.19.0 # Update embedded libfabric to fix build issue with GCC 15 # Add compatibility with CUDA 13 # Fix missing const in nondestructive request test and status query functions # Fix HCOLL support # Fix crash with GPU-aware build when running on systems with no GPUs # Fix singleton init with Hydra # Fix thread safety for Level Zero memcpy functions # Fix potential crash when release gather collective initialization fails # Fix ch3 connect/accept protocol handling when a discard event arrives after a connection is already established # Fix inlining for posix eager modules in ch4/shm # Fix weak attribute usage in MPI ABI build # Fix potential use-after-free bug in Hydra during spawn operations # Fix bug in persistent bcast algorithm # Fix bug in fabric coordinate retrieval with PMIx # Fix integer overflow and signed/unsigned bugs in ROMIO # Fix Quobtye ROMIO driver build error # Fix broken string conversion in mpi_f08 module # Fix compilation issue with mpi_f08 and NAG compiler # Fixes for various test program bugs

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MPICH 4.3.1 released
by Raffenetti, Ken 20 Jun '25

20 Jun '25

A new stable release of MPICH, 4.3.1, is now available for download. Thanks to everyone who contributed to the release! See the CHANGES below for a detailed list of fixes. You can find the release on our downloads page (https://urldefense.us/v3/__https://www.mpich.org/downloads/__;!!G_uCfscf7eW… ) Regards, The MPICH team ==================================================================== Changes in 4.3.1 ==================================================================== # Fix initialization in GPU-aware builds when no devices are present # Fix internal pmix.h header conflict when building with an external PMIx library. # Fix build issue with Slurm by removing dependency on libslurm and always using internal logic for parsing the Slurm hostfile. # Fix potential stale GPU IPC handle usage resulting in data corruption or crashes # Update XPMEM thresholds to avoid excessive buffer mapping overhead # Fix potential hang in ROMIO when setting info hints on certain files # Improved detection of incompatible PMI[x] client/server configuration # Fix use of PMIX_PREFIX attribute for certain versions of OpenPMIx # Fix Intel GPU output with MPIR_CVAR_DEBUG_SUMMARY # Fix F08 binding compilation with nvfortran # Fix line continuations with Hydra's --configfile option # Fix valgrind uninitialized read warnings in ch3 # Fix missing mpixxx_opts.conf file with help text for mpicc and friends # Fixes for several compiler warnings

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MPICH 4.3.1rc1 released
by Raffenetti, Ken 09 Jun '25

09 Jun '25

A new stable release candidate of MPICH, 4.3.1rc1, is now available for download. See the CHANGES below for a detailed list of fixes. At this stage, only critical bugs will be fixed before the 4.3.1 GA release. Please give it a try! You can find the release on our downloads page (https://urldefense.us/v3/__https://www.mpich.org/downloads/__;!!G_uCfscf7eW… ) Regards, The MPICH team ==================================================================== Changes in 4.3.1 ==================================================================== # Fix initialization in GPU-aware builds when no devices are present # Fix internal pmix.h header conflict when building with an external PMIx library. # Fix build issue with Slurm by removing dependency on libslurm and always using internal logic for parsing the Slurm hostfile. # Fix potential stale GPU IPC handle usage resulting in data corruption or crashes # Update XPMEM thresholds to avoid excessive buffer mapping overhead # Fix potential hang in ROMIO when setting info hints on certain files # Improved detection of incompatible PMI[x] client/server configuration # Fix use of PMIX_PREFIX attribute for certain versions of OpenPMIx # Fix Intel GPU output with MPIR_CVAR_DEBUG_SUMMARY # Fix F08 binding compilation with nvfortran # Fix line continuations with Hydra's --configfile option # Fix valgrind uninitialized read warnings in ch3 # Fix missing mpixxx_opts.conf file with help text for mpicc and friends # Fixes for several compiler warnings

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Re: [mpich-announce] MPICH Receives 2024 ACM Software System Award
by Ross, Robert B. 01 May '25

01 May '25

Awesome!! * Rob ________________________________ From: announce <announce-bounces(a)mpich.org> on behalf of Raffenetti, Ken via announce <announce(a)mpich.org> Sent: Thursday, May 1, 2025 3:00:10 PM To: announce(a)mpich.org <announce(a)mpich.org> Cc: Raffenetti, Ken <raffenet(a)anl.gov> Subject: [mpich-announce] MPICH Receives 2024 ACM Software System Award All, We are excited to share that MPICH has received the 2024 ACM Software System Award<https://urldefense.us/v3/__https://awards.acm.org/software-system__;!!G_uCf…>. This prestigious award recognizes software systems that have had a lasting impact on the computing field. We are proud to be in the company of distinguished past recipients like TCP/IP, GCC, Unix, TeX, LLVM, Java, NCSA Mosaic, and the World Wide Web. Thank you to all our collaborators and partners over the years who have been integral to MPICH’s success! Cheers, The MPICH Team

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