[yt-dev] Fwd: [mpi4py] [ANN] mpi4py release 2.0.0

[Matthew Turk]

Some cool new features.  We probably need to check for
backwards-incompatible changes.


---------- Forwarded message ----------
From: Lisandro Dalcin <dalcinl at gmail.com>
Date: Sun, Oct 18, 2015 at 4:15 AM
Subject: [mpi4py] [ANN] mpi4py release 2.0.0
To: mpi4py <mpi4py at googlegroups.com>


Release 2.0.0 [2015-10-18]
==========================

* Support for MPI-3 features.

  + Matched probes and receives.
  + Nonblocking collectives.
  + Neighborhood collectives.
  + New communicator constructors.
  + Request-based RMA operations.
  + New RMA communication and synchronisation calls.
  + New window constructors.
  + New datatype constructor.
  + New C++ boolean and floating complex datatypes.

* Support for MPI-2 features not included in previous releases.

  + Generalized All-to-All collective (``Comm.Alltoallw()``)
  + User-defined data representations (``Register_datarep()``)

* New scalable implementation of reduction operations for Python
  objects. This code is based on binomial tree algorithms using
  point-to-point communication and duplicated communicator
  contexts. To disable this feature, use
  ``mpi4py.rc.fast_reduce = False``.

* Backward-incompatible changes:

  + Python 2.4, 2.5, 3.0 and 3.1 are no longer supported.
  + Default MPI error handling policies are overriden. After import,
    mpi4py sets the ``ERRORS_RETURN`` error handler in ``COMM_SELF``
    and ``COMM_WORLD``, as well as any new ``Comm``, ``Win``, or
    ``File`` instance created through mpi4py, thus effectively
    ignoring the MPI rules about error handler inheritance.  This way,
    MPI errors translate to Python exceptions.  To disable this
    behavior and use the standard MPI error handling rules, use
    ``mpi4py.rc.errors = 'default'``.
  + Change signature of all send methods,
    ``dest`` is a required argument.
  + Change signature of all receive and probe methods,
    ``source`` defaults to ``ANY_SOURCE``,
    ``tag`` defaults to ``ANY_TAG``.
  + Change signature of send lowercase-spelling methods,
    ``obj`` arguments are not mandatory.
  + Change signature of recv lowercase-spelling methods,
    renamed 'obj' arguments to 'buf'.
  + Change ``Request.Waitsome()`` and ``Request.Testsome()``
    to return ``None`` or ``list``.
  + Change signature of all lowercase-spelling collectives,
    ``sendobj`` arguments are now mandatory,
    ``recvobj`` arguments were removed.
  + Reduction operations ``MAXLOC`` and ``MINLOC`` are no longer
    special-cased in lowercase-spelling methods ``Comm.[all]reduce()``
    and ``Comm.[ex]scan()``, the input object must be specified as a
    tuple ``(obj, location)``.
  + Change signature of name publishing functions.
    The new signatures are
    ``Publish_name(service_name, port_name, info=INFO_NULL)`` and
    ``Unpublish_name(service_name, port_name, info=INFO_NULL)```.
  + ``Win`` instances now cache Python objects exposing memory by
    keeping references instead of using MPI attribute caching.
  + Change signature of ``Win.Lock()``.
    The new signature is
    ``Win.Lock(rank, lock_type=LOCK_EXCLUSIVE, assertion=0)``.
  + Move ``Cartcomm.Map()`` to ``Intracomm.Cart_map()``.
  + Move ``Graphcomm.Map()`` to ``Intracomm.Graph_map()``.
  + Remove the ``mpi4py.MPE`` module.
  + Rename the Cython definition file for use with ``cimport``
    statement from ``mpi_c.pxd`` to ``libmpi.pxd``.


--
Lisandro Dalcin
============
Research Scientist
Computer, Electrical and Mathematical Sciences & Engineering (CEMSE)
Numerical Porous Media Center (NumPor)
King Abdullah University of Science and Technology (KAUST)
http://numpor.kaust.edu.sa/

4700 King Abdullah University of Science and Technology
al-Khawarizmi Bldg (Bldg 1), Office # 4332
Thuwal 23955-6900, Kingdom of Saudi Arabia
http://www.kaust.edu.sa

Office Phone: +966 12 808-0459

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