v4.0.1

Changes in 4.0.1

• Multiple fixes for NVIDIA/PGI HPC Compilers support

• Fix ch4:ofi:gni provider capability set

• Fix MPI_SESSION_INIT "thread_level" info hint

• Fix build on macOS with --disable-shared

• Fix QMPI function definitions

• Fix support for "host" info hint in MPI_COMM_SPAWN[_MULTIPLE]

• Fix manpage generation

• Add missing MPI_F_sync_reg function

• Add missing const to MPI_Psend_init buffer argument

• Make Python 3 optional in configure script

• Remove -Wl,flat_namespace from compile wrappers by default (macOS only)

• Update UCX module to v1.12.0

• Update yaksa module to support latest Ampere compute capability

v4.0

Changes in 4.0

• All MPI-4 APIs have been implemented. Major MPI-4 features include MPI
  sessions, partitioned point-to-point communications, events in the MPI tool
  information interface, large-count functions, persistent collectives,
  MPI_Comm_idup_with_info, MPI_Isendrecv and MPI_Isendrecv_replace,
  MPI_Info_get_string, MPI_Comm_split_type with new split_type --
  MPI_COMM_TYPE_HW_GUIDED and MPI_COMM_TYPE_HW_UNGUIDED.

• Add QMPI (experimental) support.

• Add MPIX_Delete_error_{class,code,string}.

• MPI_Info objects can be accessed before MPI_Init{_thread}.

• Generate C API interface functions including man page notes and error
  checking using Python scripts.

• Generate Fortran (mpif.h, mpi_f08) bindings using Python scripts.

• Generate collective entrance functions and generate per-algorithm tests.

• Support explicit --without-cuda configure option.

• Drop support for UCX version < 1.7.0.

• Configure now optionally require Python 3 (when F08 is enabled).

• Multi-NIC support in ch4:ofi.

• Default to ch4:ofi when configure doesn't have a clear choice. Add message
  block at the end of configure to advise user.

• Multiple VCI is fully implemented including the active message fallback paths.

• Extend IPC to support non-contig datatypes.

• Add AMD GPU support using HIP.

• Add generic RNDV callback mechanism with active messages.

• Refactor ch4 dynamic process functions.

• Avoid building MPL and hwloc multiple times.

• Fix MPIX_Query_cuda_support.

• Many bug fixes and code clean-ups.

v4.0rc3

tagging 'v4.0rc3'

v4.0rc2

tagging 'v4.0rc2'

v3.4.3

tagging 'v3.4.3'

v4.0a2

tagging 'v4.0a2'

v3.4.2

tagging 'v3.4.2'

MPICH 4.0a1

v4.0a1

tagging 'v4.0a1'

MPICH 3.4.1

v3.4.1

tagging 'v3.4.1'

v3.4

Changes in 3.4

• ch4 replaces ch3 as the default device configuration. If no network
  module is specified at configuration-time, MPICH will search the
  user environment in order to select one to build. The user will be
  prompted to choose if no preferred network library is detected.

• Add support for Yaksa datatype engine (default in ch4).

• Add support for GPU buffers (CUDA, Level Zero) in pt2pt,
  collectives, and one-sided communication.

• Add support for XPMEM.

• Add support for multiple virtual communication interfaces for more
  efficient MPI_THREAD_MULTIPLE (experimental).

• Add DAOS ADIO driver to ROMIO (contributed by Intel).

• Add Quobyte ADIO driver to ROMIO (contributed by Quobyte).

• Add support for Arm compiler toolchain

• Add support for NVIDIA HPC compilers

• Add support for flang/f18 Fortran compiler

• Add support for AddressSanitizer and UndefinedBehaviorSanitizer to
  debug configuration

• Remove mxm, llc, and portals4 netmods from ch3.

• Remove support for logical reduction operations on floating point
  types.

• Remove MPIX_Mutex interfaces.

• Further improvements to ch4 business card exchange: extra
  long address support and fixes for PMIx integration.

• Un-inline non-critical ch4 code for improved build times.

• Fix several test program bugs.

• Fix several static analysis and compiler warnings.

• Change the signature of MPID_Init to include requested and provided
  thread levels.