tools/perf/measurements/power.py

   1 # Copyright 2014 The Chromium Authors. All rights reserved.
   2 # Use of this source code is governed by a BSD-style license that can be
   3 # found in the LICENSE file.
   4
   5 import time
   6
   7 from metrics import network
   8 from metrics import power
   9 from telemetry.core import util
  10 from telemetry.page import page_test
  11
  12
  13 class Power(page_test.PageTest):
  14   """Measures power draw and idle wakeups during the page's interactions."""
  15
  16   def __init__(self):
  17     super(Power, self).__init__()
  18     self._power_metric = None
  19     self._network_metric = None
  20
  21   def WillStartBrowser(self, platform):
  22     self._power_metric = power.PowerMetric(platform)
  23     self._network_metric = network.NetworkMetric(platform)
  24
  25   def WillNavigateToPage(self, page, tab):
  26     self._network_metric.Start(page, tab)
  27
  28   def DidNavigateToPage(self, page, tab):
  29     self._power_metric.Start(page, tab)
  30
  31   def ValidateAndMeasurePage(self, page, tab, results):
  32     self._network_metric.Stop(page, tab)
  33     self._power_metric.Stop(page, tab)
  34     self._network_metric.AddResults(tab, results)
  35     self._power_metric.AddResults(tab, results)
  36
  37
  38 class LoadPower(Power):
  39   def WillNavigateToPage(self, page, tab):
  40     self._network_metric.Start(page, tab)
  41     self._power_metric.Start(page, tab)
  42
  43   def DidNavigateToPage(self, page, tab):
  44     pass
  45
  46
  47 class QuiescentPower(page_test.PageTest):
  48   """Measures power draw and idle wakeups after the page finished loading."""
  49
  50   # Amount of time to measure, in seconds.
  51   SAMPLE_TIME = 30
  52
  53   def ValidateAndMeasurePage(self, page, tab, results):
  54     if not tab.browser.platform.CanMonitorPower():
  55       return
  56
  57     util.WaitFor(tab.HasReachedQuiescence, 60)
  58
  59     metric = power.PowerMetric(tab.browser.platform)
  60     metric.Start(page, tab)
  61
  62     time.sleep(QuiescentPower.SAMPLE_TIME)
  63
  64     metric.Stop(page, tab)
  65     metric.AddResults(tab, results)