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remotephase: fast path newheads computation in simple case (issue5964)...
remotephase: fast path newheads computation in simple case (issue5964) Changeset 88efb7d6bcb6 fixed the logic of `phases.newheads` but greatly regressed its performance (up to many order of magnitude). The first step to fix the regression is to exit early when there is no work to do. If there are no heads to filter or not roots to filter them, we don't have to do any work. This fixes the regression when talking to an all public changeset. The performance is even better than before. pypy, compared to an all public repo ------------------------------------ 8eeed92475d5: 0.005758 seconds 88efb7d6bcb6: 0.602517 seconds (x104) this code: 0.001508 seconds (-74% from base) mercurial compared to an all public repo ---------------------------------------- 8eeed92475d5: 0.000577 seconds 88efb7d6bcb6: 0.185316 seconds (x321) this code: 0.000150 seconds (-74% from base) The performance of newheads, when actual computations are required, is fixed in the next changeset.

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python3-ratchet.py
115 lines | 4.2 KiB | text/x-python | PythonLexer
# Copyright 2012 Facebook
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
"""Find tests that newly pass under Python 3.
The approach is simple: we maintain a whitelist of Python 3 passing
tests in the repository, and periodically run all the /other/ tests
and look for new passes. Any newly passing tests get automatically
added to the whitelist.
You probably want to run it like this:
$ cd tests
$ python3 ../contrib/python3-ratchet.py \
> --working-tests=../contrib/python3-whitelist
"""
from __future__ import print_function
from __future__ import absolute_import
import argparse
import json
import os
import subprocess
import sys
_hgenv = dict(os.environ)
_hgenv.update({
'HGPLAIN': '1',
})
_HG_FIRST_CHANGE = '9117c6561b0bd7792fa13b50d28239d51b78e51f'
def _runhg(*args):
return subprocess.check_output(args, env=_hgenv)
def _is_hg_repo(path):
return _runhg('hg', 'log', '-R', path,
'-r0', '--template={node}').strip() == _HG_FIRST_CHANGE
def _py3default():
if sys.version_info[0] >= 3:
return sys.executable
return 'python3'
def main(argv=()):
p = argparse.ArgumentParser()
p.add_argument('--working-tests',
help='List of tests that already work in Python 3.')
p.add_argument('--commit-to-repo',
help='If set, commit newly fixed tests to the given repo')
p.add_argument('-j', default=os.sysconf(r'SC_NPROCESSORS_ONLN'), type=int,
help='Number of parallel tests to run.')
p.add_argument('--python3', default=_py3default(),
help='python3 interpreter to use for test run')
p.add_argument('--commit-user',
default='python3-ratchet@mercurial-scm.org',
help='Username to specify when committing to a repo.')
opts = p.parse_args(argv)
if opts.commit_to_repo:
if not _is_hg_repo(opts.commit_to_repo):
print('abort: specified repository is not the hg repository')
sys.exit(1)
if not opts.working_tests or not os.path.isfile(opts.working_tests):
print('abort: --working-tests must exist and be a file (got %r)' %
opts.working_tests)
sys.exit(1)
elif opts.commit_to_repo:
root = _runhg('hg', 'root').strip()
if not opts.working_tests.startswith(root):
print('abort: if --commit-to-repo is given, '
'--working-tests must be from that repo')
sys.exit(1)
try:
subprocess.check_call([opts.python3, '-c',
'import sys ; '
'assert ((3, 5) <= sys.version_info < (3, 6) '
'or sys.version_info >= (3, 6, 2))'])
except subprocess.CalledProcessError:
print('warning: Python 3.6.0 and 3.6.1 have '
'a bug which breaks Mercurial')
print('(see https://bugs.python.org/issue29714 for details)')
sys.exit(1)
rt = subprocess.Popen([opts.python3, 'run-tests.py', '-j', str(opts.j),
'--blacklist', opts.working_tests, '--json'])
rt.wait()
with open('report.json') as f:
data = f.read()
report = json.loads(data.split('=', 1)[1])
newpass = set()
for test, result in report.items():
if result['result'] != 'success':
continue
# A new passing test! Huzzah!
newpass.add(test)
if newpass:
# We already validated the repo, so we can just dive right in
# and commit.
if opts.commit_to_repo:
print(len(newpass), 'new passing tests on Python 3!')
with open(opts.working_tests) as f:
oldpass = {l for l in f.read().splitlines() if l}
with open(opts.working_tests, 'w') as f:
for p in sorted(oldpass | newpass):
f.write('%s\n' % p)
_runhg('hg', 'commit', '-R', opts.commit_to_repo,
'--user', opts.commit_user,
'--message', 'python3: expand list of passing tests')
else:
print('Newly passing tests:', '\n'.join(sorted(newpass)))
sys.exit(2)
if __name__ == '__main__':
main(sys.argv[1:])