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