contrib/python-zstandard/setup.py
author Gregory Szorc <gregory.szorc@gmail.com>
Sun, 20 Nov 2016 16:56:21 -0800
changeset 30461 d195fa651b51
parent 30435 b86a448a2965
child 30822 b54a2984cdd4
permissions -rwxr-xr-x
bdiff: don't check border condition in loop This is pretty much a copy of d500ddae7494, just to a different loop. The condition `p == plast` (`plast == a + len - 1`) was only true on the final iteration of the loop. So it was wasteful to check for it on every iteration. We decrease the iteration count by 1 and add an explicit check for `p == plast` after the loop. Again, we see modest wins. From the mozilla-unified repository: $ perfbdiff -m 3041e4d59df2 ! wall 0.035502 comb 0.040000 user 0.040000 sys 0.000000 (best of 100) ! wall 0.030480 comb 0.030000 user 0.030000 sys 0.000000 (best of 100) $ perfbdiff 0e9928989e9c --alldata --count 100 ! wall 4.097394 comb 4.100000 user 4.100000 sys 0.000000 (best of 3) ! wall 3.597798 comb 3.600000 user 3.600000 sys 0.000000 (best of 3) The 2nd example throws a total of ~3.3GB of data at bdiff. This change increases the throughput from ~811 MB/s to ~924 MB/s.
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#!/usr/bin/env python
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# Copyright (c) 2016-present, Gregory Szorc
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# All rights reserved.
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#
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# This software may be modified and distributed under the terms
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# of the BSD license. See the LICENSE file for details.
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from setuptools import setup
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try:
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    import cffi
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except ImportError:
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    cffi = None
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import setup_zstd
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# Code for obtaining the Extension instance is in its own module to
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# facilitate reuse in other projects.
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extensions = [setup_zstd.get_c_extension()]
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if cffi:
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    import make_cffi
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    extensions.append(make_cffi.ffi.distutils_extension())
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version = None
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with open('c-ext/python-zstandard.h', 'r') as fh:
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    for line in fh:
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        if not line.startswith('#define PYTHON_ZSTANDARD_VERSION'):
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            continue
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        version = line.split()[2][1:-1]
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        break
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if not version:
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    raise Exception('could not resolve package version; '
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                    'this should never happen')
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setup(
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    name='zstandard',
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    version=version,
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    description='Zstandard bindings for Python',
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    long_description=open('README.rst', 'r').read(),
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    url='https://github.com/indygreg/python-zstandard',
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    author='Gregory Szorc',
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    author_email='gregory.szorc@gmail.com',
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    license='BSD',
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    classifiers=[
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        'Development Status :: 4 - Beta',
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        'Intended Audience :: Developers',
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        'License :: OSI Approved :: BSD License',
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        'Programming Language :: C',
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        'Programming Language :: Python :: 2.6',
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        'Programming Language :: Python :: 2.7',
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        'Programming Language :: Python :: 3.3',
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        'Programming Language :: Python :: 3.4',
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        'Programming Language :: Python :: 3.5',
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    ],
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    keywords='zstandard zstd compression',
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    ext_modules=extensions,
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    test_suite='tests',
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)