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https://github.com/python-pillow/Pillow.git
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86 lines
2.7 KiB
Python
86 lines
2.7 KiB
Python
# A monkey patch of the base distutils.ccompiler to use parallel builds
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# Tested on 2.7, looks to be identical to 3.3.
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from __future__ import print_function
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from multiprocessing import Pool, cpu_count
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from distutils.ccompiler import CCompiler
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import os
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import sys
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try:
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MAX_PROCS = int(os.environ.get('MAX_CONCURRENCY', min(4, cpu_count())))
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except NotImplementedError:
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MAX_PROCS = None
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# hideous monkeypatching. but. but. but.
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def _mp_compile_one(tp):
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(self, obj, build, cc_args, extra_postargs, pp_opts) = tp
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try:
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src, ext = build[obj]
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except KeyError:
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return
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self._compile(obj, src, ext, cc_args, extra_postargs, pp_opts)
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return
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def _mp_compile(self, sources, output_dir=None, macros=None,
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include_dirs=None, debug=0, extra_preargs=None,
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extra_postargs=None, depends=None):
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"""Compile one or more source files.
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see distutils.ccompiler.CCompiler.compile for comments.
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"""
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# A concrete compiler class can either override this method
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# entirely or implement _compile().
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macros, objects, extra_postargs, pp_opts, build = self._setup_compile(
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output_dir, macros, include_dirs, sources, depends, extra_postargs)
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cc_args = self._get_cc_args(pp_opts, debug, extra_preargs)
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pool = Pool(MAX_PROCS)
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try:
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print("Building using %d processes" % pool._processes)
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except:
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pass
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arr = [(self, obj, build, cc_args, extra_postargs, pp_opts)
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for obj in objects]
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pool.map_async(_mp_compile_one, arr)
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pool.close()
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pool.join()
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# Return *all* object filenames, not just the ones we just built.
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return objects
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def install():
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fl_pypy3 = hasattr(sys, 'pypy_version_info') and sys.version_info > (3, 0)
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fl_win = sys.platform.startswith('win')
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fl_cygwin = sys.platform.startswith('cygwin')
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if fl_pypy3:
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# see https://github.com/travis-ci/travis-ci/issues/3587
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print("Single threaded build for pypy3")
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return
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if fl_win or fl_cygwin:
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# windows barfs on multiprocessing installs
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print("Single threaded build for windows")
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return
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if MAX_PROCS != 1:
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# explicitly don't enable if environment says 1 processor
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try:
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# bug, only enable if we can make a Pool. see issue #790 and
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# https://stackoverflow.com/questions/6033599/oserror-38-errno-38-with-multiprocessing
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pool = Pool(2)
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CCompiler.compile = _mp_compile
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except Exception as msg:
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print("Exception installing mp_compile, proceeding without:"
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"%s" % msg)
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else:
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print("Single threaded build, not installing mp_compile:"
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"%s processes" % MAX_PROCS)
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install()
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