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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
from __future__ import print_function
from distutils.version import StrictVersion
from mach.decorators import (
Command,
CommandArgument,
CommandProvider,
)
from mozbuild.base import (
MachCommandBase,
MachCommandConditions as conditions,
)
def is_osx_10_10_or_greater(cls):
import platform
release = platform.mac_ver()[0]
return release and StrictVersion(release) >= StrictVersion('10.10')
@CommandProvider
class MachCommands(MachCommandBase):
'''
Get system power consumption and related measurements.
'''
def __init__(self, context):
MachCommandBase.__init__(self, context)
@Command('power', category='misc',
conditions=[is_osx_10_10_or_greater],
description='Get system power consumption and related measurements for '
'all running browsers. Available only on Mac OS X 10.10 and above. '
'Requires root access.')
@CommandArgument('-i', '--interval', type=int, default=30000,
help='The sample period, measured in milliseconds. Defaults to 30000.')
def power(self, interval):
import os
import re
import subprocess
rapl = os.path.join(self.topobjdir, 'dist', 'bin', 'rapl')
interval = str(interval)
# Run a trivial command with |sudo| to gain temporary root privileges
# before |rapl| and |powermetrics| are called. This ensures that |rapl|
# doesn't start measuring while |powermetrics| is waiting for the root
# password to be entered.
try:
subprocess.check_call(['sudo', 'true'])
except:
print('\nsudo failed; aborting')
return 1
# This runs rapl in the background because nothing in this script
# depends on the output. This is good because we want |rapl| and
# |powermetrics| to run at the same time.
subprocess.Popen([rapl, '-n', '1', '-i', interval])
lines = subprocess.check_output(['sudo', 'powermetrics',
'--samplers', 'tasks',
'--show-process-coalition',
'--show-process-gpu',
'-n', '1',
'-i', interval])
# When run with --show-process-coalition, |powermetrics| groups outputs
# into process coalitions, each of which has a leader.
#
# For example, when Firefox runs from the dock, its coalition looks
# like this:
#
# org.mozilla.firefox
# firefox
# plugin-container
#
# When Safari runs from the dock:
#
# com.apple.Safari
# Safari
# com.apple.WebKit.Networking
# com.apple.WebKit.WebContent
# com.apple.WebKit.WebContent
#
# When Chrome runs from the dock:
#
# com.google.Chrome
# Google Chrome
# Google Chrome Helper
# Google Chrome Helper
#
# In these cases, we want to print the whole coalition.
#
# Also, when you run any of them from the command line, things are the
# same except that the leader is com.apple.Terminal and there may be
# non-browser processes in the coalition, e.g.:
#
# com.apple.Terminal
# firefox
# plugin-container
# <and possibly other, non-browser processes>
#
# Also, the WindowServer and kernel coalitions and processes are often
# relevant.
#
# We want to print all these but omit uninteresting coalitions. We
# could do this by properly parsing powermetrics output, but it's
# simpler and more robust to just grep for a handful of identifying
# strings.
print() # blank line between |rapl| output and |powermetrics| output
for line in lines.splitlines():
# Search for the following things.
#
# - '^Name' is for the columns headings line.
#
# - 'firefox' and 'plugin-container' are for Firefox
#
# - 'Safari\b' and 'WebKit' are for Safari. The '\b' excludes
# SafariCloudHistoryPush, which is a process that always
# runs, even when Safari isn't open.
#
# - 'Chrome' is for Chrome.
#
# - 'Terminal' is for the terminal. If no browser is running from
# within the terminal, it will show up unnecessarily. This is a
# minor disadvantage of this very simple parsing strategy.
#
# - 'WindowServer' is for the WindowServer.
#
# - 'kernel' is for the kernel.
#
if re.search(r'(^Name|firefox|plugin-container|Safari\b|WebKit|Chrome|Terminal|WindowServer|kernel)', line):
print(line)
return 0
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