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bundle2: implement consume() API on unbundlepart...
bundle2: implement consume() API on unbundlepart We want bundle parts to not be seekable by default. That means eliminating the generic seek() method. A common pattern in bundle2.py is to seek to the end of the part data. This is mainly used by the part iteration code to ensure the underlying stream is advanced to the next bundle part. In this commit, we establish a dedicated API for consuming a bundle2 part data. We switch users of seek() to it. The old implementation of seek(0, os.SEEK_END) would effectively call self.read(). The new implementation calls self.read(32768) in a loop. The old implementation would therefore assemble a buffer to hold all remaining data being seeked over. For seeking over large bundle parts, this would involve a large allocation and a lot of overhead to collect intermediate data! This overhead can be seen in the results for `hg perfbundleread`: ! bundle2 iterparts() ! wall 10.891305 comb 10.820000 user 7.990000 sys 2.830000 (best of 3) ! wall 8.070791 comb 8.060000 user 7.180000 sys 0.880000 (best of 3) ! bundle2 part seek() ! wall 12.991478 comb 10.390000 user 7.720000 sys 2.670000 (best of 3) ! wall 10.370142 comb 10.350000 user 7.430000 sys 2.920000 (best of 3) Of course, skipping over large payload data isn't likely very common. So I doubt the performance wins will be observed in the wild. Differential Revision: https://phab.mercurial-scm.org/D1388

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setup.py
76 lines | 2.1 KiB | text/x-python | PythonLexer
Gregory Szorc
zstd: vendor python-zstandard 0.5.0...
r30435 #!/usr/bin/env python
# Copyright (c) 2016-present, Gregory Szorc
# All rights reserved.
#
# This software may be modified and distributed under the terms
# of the BSD license. See the LICENSE file for details.
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r30822 import sys
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r30435 from setuptools import setup
try:
import cffi
except ImportError:
cffi = None
import setup_zstd
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r30822 SUPPORT_LEGACY = False
if "--legacy" in sys.argv:
SUPPORT_LEGACY = True
sys.argv.remove("--legacy")
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r30435 # Code for obtaining the Extension instance is in its own module to
# facilitate reuse in other projects.
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r30822 extensions = [setup_zstd.get_c_extension(SUPPORT_LEGACY, 'zstd')]
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r30435
Gregory Szorc
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r31796 install_requires = []
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r30435 if cffi:
import make_cffi
extensions.append(make_cffi.ffi.distutils_extension())
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r31796 # Need change in 1.8 for ffi.from_buffer() behavior.
install_requires.append('cffi>=1.8')
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r30435 version = None
with open('c-ext/python-zstandard.h', 'r') as fh:
for line in fh:
if not line.startswith('#define PYTHON_ZSTANDARD_VERSION'):
continue
version = line.split()[2][1:-1]
break
if not version:
raise Exception('could not resolve package version; '
'this should never happen')
setup(
name='zstandard',
version=version,
description='Zstandard bindings for Python',
long_description=open('README.rst', 'r').read(),
url='https://github.com/indygreg/python-zstandard',
author='Gregory Szorc',
author_email='gregory.szorc@gmail.com',
license='BSD',
classifiers=[
'Development Status :: 4 - Beta',
'Intended Audience :: Developers',
'License :: OSI Approved :: BSD License',
'Programming Language :: C',
'Programming Language :: Python :: 2.6',
'Programming Language :: Python :: 2.7',
'Programming Language :: Python :: 3.3',
'Programming Language :: Python :: 3.4',
'Programming Language :: Python :: 3.5',
Gregory Szorc
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r30895 'Programming Language :: Python :: 3.6',
Gregory Szorc
zstd: vendor python-zstandard 0.5.0...
r30435 ],
keywords='zstandard zstd compression',
ext_modules=extensions,
test_suite='tests',
Gregory Szorc
zstd: vendor python-zstandard 0.8.0...
r31796 install_requires=install_requires,
Gregory Szorc
zstd: vendor python-zstandard 0.5.0...
r30435 )