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# Copyright 2018 The gRPC Authors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Patches the compile() to allow enable parallel compilation of C/C++.
build_ext has lots of C/C++ files and normally them one by one.
Enabling parallel build helps a lot.
"""
import distutils.ccompiler
import os
try:
BUILD_EXT_COMPILER_JOBS = int(
os.environ.get('GRPC_PYTHON_BUILD_EXT_COMPILER_JOBS', '1'))
except ValueError:
BUILD_EXT_COMPILER_JOBS = 1
# monkey-patch for parallel compilation
def _parallel_compile(self,
sources,
output_dir=None,
macros=None,
include_dirs=None,
debug=0,
extra_preargs=None,
extra_postargs=None,
depends=None):
# setup the same way as distutils.ccompiler.CCompiler
# https://github.com/python/cpython/blob/31368a4f0e531c19affe2a1becd25fc316bc7501/Lib/distutils/ccompiler.py#L564
macros, objects, extra_postargs, pp_opts, build = self._setup_compile(
output_dir, macros, include_dirs, sources, depends, extra_postargs)
cc_args = self._get_cc_args(pp_opts, debug, extra_preargs)
def _compile_single_file(obj):
try:
src, ext = build[obj]
except KeyError:
return
self._compile(obj, src, ext, cc_args, extra_postargs, pp_opts)
# run compilation of individual files in parallel
import multiprocessing.pool
multiprocessing.pool.ThreadPool(BUILD_EXT_COMPILER_JOBS).map(
_compile_single_file, objects)
return objects
def monkeypatch_compile_maybe():
"""Monkeypatching is dumb, but the build speed gain is worth it."""
if BUILD_EXT_COMPILER_JOBS > 1:
distutils.ccompiler.CCompiler.compile = _parallel_compile
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