3.1.6

WARNING: This is the last release supporting Python 2.

• Fix various build issues.

3.1.5

WARNING: This is the last release supporting Python 2.

• Rebuild C sources with Cython 0.29.36 to support Python 3.12.

3.1.4

WARNING: This is the last release supporting Python 2.

• Rebuild C sources with Cython 0.29.32 to support Python 3.11.

• Fix contiguity check for DLPack and CAI buffers.

• Workaround build failures with setuptools v60.

3.1.3

WARNING: This is the last release supporting Python 2.

• Add missing support for MPI.BOTTOM to generalized all-to-all collectives.

3.1.2

WARNING: This is the last release supporting Python 2.

• mpi4py.futures: Add _max_workers property to MPIPoolExecutor.

• mpi4py.util.dtlib: Fix computation of alignment for predefined datatypes.

• mpi4py.util.pkl5: Fix deadlock when using ssend() + mprobe().

• mpi4py.util.pkl5: Add environment variable MPI4PY_PICKLE_THRESHOLD.

• mpi4py.rc: Interpret "y" and "n" strings as boolean values.

• Fix/add typemap/typestr for MPI.WCHAR/MPI.COUNT datatypes.

• Minor fixes and additions to documentation.

• Minor fixes to typing support.

• Support for local version identifier (PEP-440).

3.1.1

WARNING: This is the last release supporting Python 2.

• Fix typo in Requires-Python package metadata.

• Regenerate C sources with Cython 0.29.24.

3.1.0

WARNING: This is the last release supporting Python 2.

• New features:

  • mpi4py.util: New package collecting miscellaneous utilities.

• Enhancements:

  • Add pickle-based Request.waitsome() and Request.testsome().

  • Add lowercase methods Request.get_status() and Request.cancel().

  • Support for passing Python GPU arrays compliant with the DLPack_ data
    interchange mechanism (link) and the __cuda_array_interface__
    (CAI) standard (link) to uppercase methods. This support requires
    that mpi4py is built against CUDA-aware MPI implementations. This
    feature is currently experimental and subject to future changes.

  • mpi4py.futures: Add support for initializers and canceling futures at shutdown.
    Environment variables names now follow the pattern MPI4PY_FUTURES_*, the
    previous MPI4PY_* names are deprecated.

  • Add type annotations to Cython code. The first line of the docstring of functions
    and methods displays a signature including type annotations.

  • Add companion stub files to support type checkers.

  • Support for weak references.

• Miscellaneous:

  • Add a new mpi4py publication (link) to the citation listing.

3.0.3

• Regenerate Cython wrappers to support Python 3.8.

3.0.2

• Bug fixes:

  • Fix handling of readonly buffers in support for Python 2 legacy
    buffer interface. The issue triggers only when using a buffer-like
    object that is readonly and does not export the new Python 3
    buffer interface.
  • Fix build issues with Open MPI 4.0.x series related to removal of
    many MPI-1 symbols deprecated in MPI-2 and removed in MPI-3.
  • Minor documentation fixes.

3.0.1

• Bug fixes:

  • Fix Comm.scatter() and other collectives corrupting input send
    list. Add safety measures to prevent related issues in global
    reduction operations.
  • Fix error-checking code for counts in Op.Reduce_local().

• Enhancements:

  • Map size-specific Python/NumPy typecodes to MPI datatypes.
  • Allow partial specification of target list/tuple arguments in the
    various Win RMA methods.
  • Workaround for removal of MPI_{LB|UB} in Open MPI 4.0.
  • Support for Microsoft MPI v10.0.