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From: Armin Rigo <arigo@tunes.org>
Date: Sat, 30 Apr 2011 17:04:41 +0200
Subject: PyPy 1.5 released
To: PyPy Dev <pypy-dev@codespeak.net>, python-announce-list@python.org
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PyPy 1.5: Catching Up
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We're pleased to announce the 1.5 release of PyPy. This release updates
PyPy with the features of CPython 2.7.1, including the standard library. Th=
us
all the features of `CPython 2.6`_ and `CPython 2.7`_ are now supported. It
also contains additional performance improvements. You can download it here=
:

    http://pypy.org/download.html

What is PyPy?
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PyPy is a very compliant Python interpreter, almost a drop-in replacement f=
or
CPython 2.7.1. It's fast (`pypy 1.5 and cpython 2.6.2`_ performance compari=
son)
due to its integrated tracing JIT compiler.

This release includes the features of CPython 2.6 and 2.7. It also includes=
 a
large number of small improvements to the tracing JIT compiler. It supports
Intel machines running Linux 32/64 or Mac OS X.  Windows is beta (it roughl=
y
works but a lot of small issues have not been fixed so far).  Windows 64 is
not yet supported.

Numerous speed achievements are described on `our blog`_. Normalized speed
charts comparing `pypy 1.5 and pypy 1.4`_ as well as `pypy 1.5 and cpython
2.6.2`_ are available on our benchmark website. The speed improvement over =
1.4
seems to be around 25% on average.

More highlights
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- The largest change in PyPy's tracing JIT is adding support for `loop inva=
riant
  code motion`_, which was mostly done by H=E5kan Ard=F6. This feature impr=
oves the
  performance of tight loops doing numerical calculations.

- The CPython extension module API has been improved and now supports many =
more
  extensions. For information on which one are supported, please refer to o=
ur
  `compatibility wiki`_.

- These changes make it possible to support `Tkinter and IDLE`_.

- The `cProfile`_ profiler is now working with the JIT. However, it skews t=
he
  performance in unstudied ways. Therefore it is not yet usable to analyze
  subtle performance problems (the same is true for CPython of course).

- There is an `external fork`_ which includes an RPython version of the
  ``postgresql``.  However, there are no prebuilt binaries for this.

- Our developer documentation was moved to Sphinx and cleaned up.
  (click 'Dev Site' on http://pypy.org/ .)

- and many small things :-)


Cheers,

Carl Friedrich Bolz, Laura Creighton, Antonio Cuni, Maciej Fijalkowski,
Amaury Forgeot d'Arc, Alex Gaynor, Armin Rigo and the PyPy team


.. _`CPython 2.6`: http://docs.python.org/dev/whatsnew/2.6.html
.. _`CPython 2.7`: http://docs.python.org/dev/whatsnew/2.7.html

.. _`our blog`: http://morepypy.blogspot.com
.. _`pypy 1.5 and pypy 1.4`: http://bit.ly/joPhHo
.. _`pypy 1.5 and cpython 2.6.2`: http://bit.ly/mbVWwJ

.. _`loop invariant code motion`:
http://morepypy.blogspot.com/2011/01/loop-invariant-code-motion.html
.. _`compatibility wiki`: https://bitbucket.org/pypy/compatibility/wiki/Hom=
e
.. _`Tkinter and IDLE`:
http://morepypy.blogspot.com/2011/04/using-tkinter-and-idle-with-pypy.html
.. _`cProfile`: http://docs.python.org/library/profile.html
.. _`external fork`: https://bitbucket.org/alex_gaynor/pypy-postgresql