2 # Copyright 2020 The Chromium Authors
3 # Use of this source code is governed by a BSD-style license that can be
4 # found in the LICENSE file.
5 """Downloads pgo profiles for optimizing official Chrome.
7 This script has the following responsibilities:
8 1. Download a requested profile if necessary.
9 2. Return a path to the current profile to feed to the build system.
10 3. Removed stale profiles (2 days) to save disk spaces because profiles are
11 large (~1GB) and updated frequently (~4 times a day).
14 from __future__ import print_function
21 _SRC_ROOT = os.path.abspath(
22 os.path.join(os.path.dirname(__file__), os.path.pardir))
23 sys.path.append(os.path.join(_SRC_ROOT, 'third_party', 'depot_tools'))
24 import download_from_google_storage
26 sys.path.append(os.path.join(_SRC_ROOT, 'build'))
29 # Absolute path to the directory that stores pgo related state files, which
30 # specifcies which profile to update and use.
31 _PGO_DIR = os.path.join(_SRC_ROOT, 'chrome', 'build')
33 # Absolute path to the directory that stores pgo profiles.
34 _PGO_PROFILE_DIR = os.path.join(_PGO_DIR, 'pgo_profiles')
37 def _read_profile_name(target):
38 """Read profile name given a target.
41 target(str): The target name, such as win32, mac.
44 Name of the profile to update and use, such as:
45 chrome-win32-master-67ad3c89d2017131cc9ce664a1580315517550d1.profdata.
47 state_file = os.path.join(_PGO_DIR, '%s.pgo.txt' % target)
48 with open(state_file, 'r') as f:
49 profile_name = f.read().strip()
54 def _remove_unused_profiles(current_profile_name):
55 """Removes unused profiles, except the current one, to save disk space."""
57 expiration_duration = 60 * 60 * 24 * days
58 for f in os.listdir(_PGO_PROFILE_DIR):
59 if f == current_profile_name:
62 p = os.path.join(_PGO_PROFILE_DIR, f)
63 age = time.time() - os.path.getmtime(p)
64 if age > expiration_duration:
65 print('Removing profile %s as it hasn\'t been used in the past %d days' %
71 """Update profile if necessary according to the state file.
74 args(dict): A dict of cmd arguments, such as target and gs_url_base.
77 RuntimeError: If failed to download profiles from gcs.
79 profile_name = _read_profile_name(args.target)
80 profile_path = os.path.join(_PGO_PROFILE_DIR, profile_name)
81 if os.path.isfile(profile_path):
82 os.utime(profile_path, None)
85 gsutil = download_from_google_storage.Gsutil(
86 download_from_google_storage.GSUTIL_DEFAULT_PATH)
87 gs_path = 'gs://' + args.gs_url_base.strip('/') + '/' + profile_name
88 code = gsutil.call('cp', gs_path, profile_path)
90 raise RuntimeError('gsutil failed to download "%s"' % gs_path)
92 _remove_unused_profiles(profile_name)
95 def _get_profile_path(args):
96 """Returns an absolute path to the current profile.
99 args(dict): A dict of cmd arguments, such as target and gs_url_base.
102 RuntimeError: If the current profile is missing.
104 profile_path = os.path.join(_PGO_PROFILE_DIR, _read_profile_name(args.target))
105 if not os.path.isfile(profile_path):
107 'requested profile "%s" doesn\'t exist, please make sure '
108 '"checkout_pgo_profiles" is set to True in the "custom_vars" section '
109 'of your .gclient file, e.g.: \n'
114 ' "custom_vars": { \n'
115 ' "checkout_pgo_profiles": True, \n'
119 'and then run "gclient runhooks" to download it. You can also simply '
120 'disable the PGO optimizations by setting |chrome_pgo_phase = 0| in '
121 'your GN arguments.'%
124 os.utime(profile_path, None)
125 profile_path.rstrip(os.sep)
126 print(gn_helpers.ToGNString(profile_path))
130 parser = argparse.ArgumentParser(
131 description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter)
148 help='Identifier of a specific target platform + architecture.')
149 subparsers = parser.add_subparsers()
151 parser_update = subparsers.add_parser('update')
152 parser_update.add_argument(
155 help='The base GS URL to search for the profile.')
156 parser_update.set_defaults(func=_update)
158 parser_get_profile_path = subparsers.add_parser('get_profile_path')
159 parser_get_profile_path.set_defaults(func=_get_profile_path)
161 args = parser.parse_args()
162 return args.func(args)
165 if __name__ == '__main__':