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.