[ANN] mpi4py release 3.1.0

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Lisandro Dalcin

Aug 12, 2021, 4:31:38 AMAug 12
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Many thanks to Leo Fang (@leofang) for helping with this release and his GPU-related contributions.

**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][DIM]) and the `__cuda_array_interface__`
    (CAI) standard ([link][CAI]) to uppercase methods. This support requires
    that mpi4py is built against [CUDA-aware MPI][CAM] 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][DOI]) to the citation listing.

[DLPack]: https://github.com/dmlc/dlpack
[DIM]: https://data-apis.org/array-api/latest/design_topics/data_interchange.html
[CAI]: https://numba.readthedocs.io/en/stable/cuda/cuda_array_interface.html
[CAM]: https://developer.nvidia.com/blog/introduction-cuda-aware-mpi/
[DOI]: https://doi.org/10.1109/MCSE.2021.3083216

Lisandro Dalcin
Senior Research Scientist
Extreme Computing Research Center (ECRC)
King Abdullah University of Science and Technology (KAUST)
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