# pypy / pypy / doc / release-1.8.0.rst

 Maciej Fijalkows… 1be9e40 2012-02-06 Antonio Cuni 646611c 2012-02-06 Maciej Fijalkows… 1be9e40 2012-02-06 Antonio Cuni 58f2412 2012-02-09 Maciej Fijalkows… 38e0a3e 2012-02-10 Antonio Cuni 58f2412 2012-02-09 Maciej Fijalkows… 38e0a3e 2012-02-10 Maciej Fijalkows… 1be9e40 2012-02-06 Antonio Cuni 58f2412 2012-02-09 Maciej Fijalkows… 1be9e40 2012-02-06 Maciej Fijalkows… 70757df 2012-02-08 Maciej Fijalkows… 1be9e40 2012-02-06 Armin Rigo 50a9ef5 2012-02-08 Armin Rigo c8a0f23 2012-02-08 Maciej Fijalkows… 1be9e40 2012-02-06 Armin Rigo c1cab89 2012-02-07 Maciej Fijalkows… 1be9e40 2012-02-06 Maciej Fijalkows… 3230ad3 2012-02-08 Maciej Fijalkows… 1be9e40 2012-02-06 Maciej Fijalkows… 3230ad3 2012-02-08 Maciej Fijalkows… 1be9e40 2012-02-06 Maciej Fijalkows… 3230ad3 2012-02-08 Maciej Fijalkows… 70757df 2012-02-08 Maciej Fijalkows… 11d854d 2012-02-08 Maciej Fijalkows… 70757df 2012-02-08 Armin Rigo c8a0f23 2012-02-08 Maciej Fijalkows… 70757df 2012-02-08 Antonio Cuni 58f2412 2012-02-09 Maciej Fijalkows… 70757df 2012-02-08 Maciej Fijalkows… 38e0a3e 2012-02-10 Maciej Fijalkows… 70757df 2012-02-08 Maciej Fijalkows… 3230ad3 2012-02-08 Maciej Fijalkows… 70757df 2012-02-08  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 ============================ PyPy 1.8 - business as usual ============================ We're pleased to announce the 1.8 release of PyPy. As habitual this release brings a lot of bugfixes, together with performance and memory improvements over the 1.7 release. The main highlight of the release is the introduction of list strategies_ which makes homogenous lists more efficient both in terms of performance and memory. This release also upgrades us from Python 2.7.1 compatibility to 2.7.2. Otherwise it's "business as usual" in the sense that performance improved roughly 10% on average since the previous release. you can download the PyPy 1.8 release here: http://pypy.org/download.html .. _list strategies: http://morepypy.blogspot.com/2011/10/more-compact-lists-with-list-strategies.html What is PyPy? ============= PyPy is a very compliant Python interpreter, almost a drop-in replacement for CPython 2.7. It's fast (pypy 1.8 and cpython 2.7.1_ performance comparison) due to its integrated tracing JIT compiler. This release supports x86 machines running Linux 32/64, Mac OS X 32/64 or Windows 32. Windows 64 work has been stalled, we would welcome a volunteer to handle that. .. _pypy 1.8 and cpython 2.7.1: http://speed.pypy.org Highlights ========== * List strategies. Now lists that contain only ints or only floats should be as efficient as storing them in a binary-packed array. It also improves the JIT performance in places that use such lists. There are also special strategies for unicode and string lists. * As usual, numerous performance improvements. There are many examples of python constructs that now should be faster; too many to list them. * Bugfixes and compatibility fixes with CPython. * Windows fixes. * NumPy effort progress; for the exact list of things that have been done, consult the numpy status page_. A tentative list of things that has been done: * multi dimensional arrays * various sizes of dtypes * a lot of ufuncs * a lot of other minor changes Right now the numpy module is available under both numpy and numpypy names. However, because it's incomplete, you have to import numpypy first before doing any imports from numpy. * New JIT hooks that allow you to hook into the JIT process from your python program. There is a brief overview_ of what they offer. * Standard library upgrade from 2.7.1 to 2.7.2. Ongoing work ============ As usual, there is quite a bit of ongoing work that either didn't make it to the release or is not ready yet. Highlights include: * Non-x86 backends for the JIT: ARMv7 (almost ready) and PPC64 (in progress) * Specialized type instances - allocate instances as efficient as C structs, including type specialization * More numpy work * Since the last release there was a significant breakthrough in PyPy's fundraising. We now have enough funds to work on first stages of numpypy_ and py3k_. We would like to thank again to everyone who donated. * It's also probably worth noting, we're considering donations for the Software Transactional Memory project. You can read more about our plans_ Cheers, The PyPy Team .. _brief overview: http://doc.pypy.org/en/latest/jit-hooks.html .. _numpy status page: http://buildbot.pypy.org/numpy-status/latest.html .. _numpy status update blog report: http://morepypy.blogspot.com/2012/01/numpypy-status-update.html .. _numpypy: http://pypy.org/numpydonate.html .. _py3k: http://pypy.org/py3donate.html .. _our plans: http://morepypy.blogspot.com/2012/01/transactional-memory-ii.html 
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