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bpo-45020: Freeze some of the modules imported during startup. (gh-28335)

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Doing this provides significant performance gains for runtime startup (~15% with all the imported modules frozen). We don't yet freeze all the imported modules because there are a few hiccups in the build systems we need to sort out first. (See bpo-45186 and bpo-45188.)

Note that in PR GH-28320 we added a command-line flag (-X frozen_modules=[on|off]) that allows users to opt out of (or into) using frozen modules. The default is still "off" but we will change it to "on" as soon as we can do it in a way that does not cause contributors pain.

https://bugs.python.org/issue45020
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Eric Snow 2021-09-15 10:19:30 -06:00 • committed by GitHub
parent 1a9ef57985
commit cbeb819710
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19 changed files with 6879 additions and 30 deletions
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Lib/test/test_pydoc.py
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@ -23,6 +23,7 @@ import xml.etree.ElementTree
import textwrap
from io import StringIO
from collections import namedtuple
from test.support import import_helper
from test.support import os_helper
from test.support.script_helper import assert_python_ok, assert_python_failure
from test.support import threading_helper
@ -728,6 +729,7 @@ class PydocDocTest(unittest.TestCase):
@unittest.skipIf(sys.flags.optimize >= 2,
'Docstrings are omitted with -OO and above')
def test_synopsis_sourceless(self):
os = import_helper.import_fresh_module('os')
expected = os.__doc__.splitlines()[0]
filename = os.__cached__
synopsis = pydoc.synopsis(filename)