mpi4py/mpi4py 3.0.0

on GitHub

New features:

• mpi4py.futures: Execute computations asynchronously using a pool
  of MPI processes. This package is based on concurrent.futures
  from the Python standard library.
• mpi4py.run: Run Python code and abort execution in case of
  unhandled exceptions to prevent deadlocks.
• mpi4py.bench: Run basic MPI benchmarks and tests.

Enhancements:

• Lowercase, pickle-based collective communication calls are now
  thread-safe through the use of fine-grained locking.
• The MPI module now exposes a memory type which is a
  lightweight variant of the builtin memoryview type, but
  exposes both the legacy Python 2 and the modern Python 3 buffer
  interface under a Python 2 runtime.
• The MPI.Comm.Alltoallw() method now uses count=1 and
  displ=0 as defaults, assuming that messages are specified
  through user-defined datatypes.
• The Request.Wait[all]() methods now return True to match
  the interface of Request.Test[all]().
• The Win class now implements the Python buffer interface.

Backward-incompatible changes:

• The buf argument of the MPI.Comm.recv() method is
  deprecated, passing anything but None emits a warning.
• The MPI.Win.memory property was removed, use the
  MPI.Win.tomemory() method instead.
• Executing python -m mpi4py in the command line is now
  equivalent to python -m mpi4py.run. For the former behavior,
  use python -m mpi4py.bench.
• Python 2.6 and 3.2 are no longer supported. The mpi4py.MPI
  module may still build and partially work, but other pure-Python
  modules under the mpi4py namespace will not.
• Windows: Remove support for legacy MPICH2, Open MPI, and DeinoMPI.