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#!/usr/bin/env python
# Copyright 2020 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Downloads pgo profiles for optimizing official Chrome.
This script has the following responsibilities:
1. Download a requested profile if necessary.
2. Return a path to the current profile to feed to the build system.
3. Removed stale profiles (2 days) to save disk spaces because profiles are
large (~1GB) and updated frequently (~4 times a day).
"""
from __future__ import print_function
import argparse
import os
import sys
import time
_SRC_ROOT = os.path.abspath(
os.path.join(os.path.dirname(__file__), os.path.pardir))
sys.path.append(os.path.join(_SRC_ROOT, 'third_party', 'depot_tools'))
import download_from_google_storage
sys.path.append(os.path.join(_SRC_ROOT, 'build'))
import gn_helpers
# Absolute path to the directory that stores pgo related state files, which
# specifcies which profile to update and use.
_PGO_DIR = os.path.join(_SRC_ROOT, 'chrome', 'build')
# Absolute path to the directory that stores pgo profiles.
_PGO_PROFILE_DIR = os.path.join(_PGO_DIR, 'pgo_profiles')
def _read_profile_name(target):
"""Read profile name given a target.
Args:
target(str): The target name, such as win32, mac.
Returns:
Name of the profile to update and use, such as:
chrome-win32-master-67ad3c89d2017131cc9ce664a1580315517550d1.profdata.
"""
state_file = os.path.join(_PGO_DIR, '%s.pgo.txt' % target)
with open(state_file, 'r') as f:
profile_name = f.read().strip()
return profile_name
def _remove_unused_profiles(current_profile_name):
"""Removes unused profiles, except the current one, to save disk space."""
days = 2
expiration_duration = 60 * 60 * 24 * days
for f in os.listdir(_PGO_PROFILE_DIR):
if f == current_profile_name:
continue
p = os.path.join(_PGO_PROFILE_DIR, f)
age = time.time() - os.path.getmtime(p)
if age > expiration_duration:
print('Removing profile %s as it hasn\'t been used in the past %d days' %
(p, days))
os.remove(p)
def _update(args):
"""Update profile if necessary according to the state file.
Args:
args(dict): A dict of cmd arguments, such as target and gs_url_base.
Raises:
RuntimeError: If failed to download profiles from gcs.
"""
profile_name = _read_profile_name(args.target)
profile_path = os.path.join(_PGO_PROFILE_DIR, profile_name)
if os.path.isfile(profile_path):
os.utime(profile_path, None)
return
gsutil = download_from_google_storage.Gsutil(
download_from_google_storage.GSUTIL_DEFAULT_PATH)
gs_path = 'gs://' + args.gs_url_base.strip('/') + '/' + profile_name
code = gsutil.call('cp', gs_path, profile_path)
if code != 0:
raise RuntimeError('gsutil failed to download "%s"' % gs_path)
_remove_unused_profiles(profile_name)
def _get_profile_path(args):
"""Returns an absolute path to the current profile.
Args:
args(dict): A dict of cmd arguments, such as target and gs_url_base.
Raises:
RuntimeError: If the current profile is missing.
"""
profile_path = os.path.join(_PGO_PROFILE_DIR, _read_profile_name(args.target))
if not os.path.isfile(profile_path):
raise RuntimeError(
'requested profile "%s" doesn\'t exist, please make sure '
'"checkout_pgo_profiles" is set to True in the "custom_vars" section '
'of your .gclient file, e.g.: \n'
'solutions = [ \n'
' { \n'
' "name": "src", \n'
' # ... \n'
' "custom_vars": { \n'
' "checkout_pgo_profiles": True, \n'
' }, \n'
' }, \n'
'], \n'
'and then run "gclient runhooks" to download it. You can also simply '
'disable the PGO optimizations by setting |chrome_pgo_phase = 0| in '
'your GN arguments.'%
profile_path)
os.utime(profile_path, None)
profile_path.rstrip(os.sep)
print(gn_helpers.ToGNString(profile_path))
def main():
parser = argparse.ArgumentParser(
description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter)
parser.add_argument(
'--target',
required=True,
choices=['win32', 'win64', 'mac', 'mac-arm', 'linux'],
help='Identifier of a specific target platform + architecture.')
subparsers = parser.add_subparsers()
parser_update = subparsers.add_parser('update')
parser_update.add_argument(
'--gs-url-base',
required=True,
help='The base GS URL to search for the profile.')
parser_update.set_defaults(func=_update)
parser_get_profile_path = subparsers.add_parser('get_profile_path')
parser_get_profile_path.set_defaults(func=_get_profile_path)
args = parser.parse_args()
return args.func(args)
if __name__ == '__main__':
sys.exit(main())
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