tools/perf/measurements/page_cycler.py

   1 # Copyright 2012 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 """The page cycler measurement.
   6
   7 This measurement registers a window load handler in which is forces a layout and
   8 then records the value of performance.now(). This call to now() measures the
   9 time from navigationStart (immediately after the previous page's beforeunload
  10 event) until after the layout in the page's load event. In addition, two garbage
  11 collections are performed in between the page loads (in the beforeunload event).
  12 This extra garbage collection time is not included in the measurement times.
  13
  14 Finally, various memory and IO statistics are gathered at the very end of
  15 cycling all pages.
  16 """
  17
  18 import collections
  19 import os
  20
  21 from metrics import cpu
  22 from metrics import keychain_metric
  23 from metrics import memory
  24 from metrics import power
  25 from metrics import speedindex
  26 from metrics import v8_object_stats
  27 from telemetry.core import util
  28 from telemetry.page import page_test
  29 from telemetry.value import scalar
  30
  31
  32 class PageCycler(page_test.PageTest):
  33   def __init__(self, page_repeat, pageset_repeat, cold_load_percent=50,
  34                record_v8_object_stats=False, report_speed_index=False,
  35                clear_cache_before_each_run=False):
  36     super(PageCycler, self).__init__(
  37         clear_cache_before_each_run=clear_cache_before_each_run)
  38
  39     with open(os.path.join(os.path.dirname(__file__),
  40                            'page_cycler.js'), 'r') as f:
  41       self._page_cycler_js = f.read()
  42
  43     self._record_v8_object_stats = record_v8_object_stats
  44     self._report_speed_index = report_speed_index
  45     self._speedindex_metric = speedindex.SpeedIndexMetric()
  46     self._memory_metric = None
  47     self._power_metric = None
  48     self._cpu_metric = None
  49     self._v8_object_stats_metric = None
  50     self._has_loaded_page = collections.defaultdict(int)
  51     self._initial_renderer_url = None  # to avoid cross-renderer navigation
  52
  53     cold_runs_percent_set = (cold_load_percent != None)
  54     # Handle requests for cold cache runs
  55     if (cold_runs_percent_set and
  56         (cold_load_percent < 0 or cold_load_percent > 100)):
  57       raise Exception('cold-load-percent must be in the range [0-100]')
  58
  59     # Make sure _cold_run_start_index is an integer multiple of page_repeat.
  60     # Without this, --pageset_shuffle + --page_repeat could lead to
  61     # assertion failures on _started_warm in WillNavigateToPage.
  62     if cold_runs_percent_set:
  63       number_warm_pageset_runs = int(
  64           (int(pageset_repeat) - 1) * (100 - cold_load_percent) / 100)
  65       number_warm_runs = number_warm_pageset_runs * page_repeat
  66       self._cold_run_start_index = number_warm_runs + page_repeat
  67       self._discard_first_result = (not cold_load_percent or
  68                                     self._discard_first_result)
  69     else:
  70       self._cold_run_start_index = pageset_repeat * page_repeat
  71
  72   def WillStartBrowser(self, platform):
  73     """Initialize metrics once right before the browser has been launched."""
  74     self._power_metric = power.PowerMetric(platform)
  75
  76   def DidStartBrowser(self, browser):
  77     """Initialize metrics once right after the browser has been launched."""
  78     self._memory_metric = memory.MemoryMetric(browser)
  79     self._cpu_metric = cpu.CpuMetric(browser)
  80     if self._record_v8_object_stats:
  81       self._v8_object_stats_metric = v8_object_stats.V8ObjectStatsMetric()
  82
  83   def WillNavigateToPage(self, page, tab):
  84     if page.is_file:
  85       # For legacy page cyclers which use the filesystem, do an initial
  86       # navigate to avoid paying for a cross-renderer navigation.
  87       initial_url = tab.browser.http_server.UrlOf('nonexistent.html')
  88       if self._initial_renderer_url != initial_url:
  89         self._initial_renderer_url = initial_url
  90         tab.Navigate(self._initial_renderer_url)
  91
  92     page.script_to_evaluate_on_commit = self._page_cycler_js
  93     if self.ShouldRunCold(page.url):
  94       tab.ClearCache(force=True)
  95     if self._report_speed_index:
  96       self._speedindex_metric.Start(page, tab)
  97     self._cpu_metric.Start(page, tab)
  98     self._power_metric.Start(page, tab)
  99
 100   def DidNavigateToPage(self, page, tab):
 101     self._memory_metric.Start(page, tab)
 102     if self._record_v8_object_stats:
 103       self._v8_object_stats_metric.Start(page, tab)
 104
 105   def CustomizeBrowserOptions(self, options):
 106     memory.MemoryMetric.CustomizeBrowserOptions(options)
 107     power.PowerMetric.CustomizeBrowserOptions(options)
 108     options.AppendExtraBrowserArgs('--js-flags=--expose_gc')
 109
 110     if self._record_v8_object_stats:
 111       v8_object_stats.V8ObjectStatsMetric.CustomizeBrowserOptions(options)
 112     if self._report_speed_index:
 113       self._speedindex_metric.CustomizeBrowserOptions(options)
 114
 115     keychain_metric.KeychainMetric.CustomizeBrowserOptions(options)
 116
 117   def ValidateAndMeasurePage(self, page, tab, results):
 118     tab.WaitForJavaScriptExpression('__pc_load_time', 60)
 119
 120     chart_name_prefix = ('cold_' if self.IsRunCold(page.url) else
 121                          'warm_')
 122
 123     results.AddValue(scalar.ScalarValue(
 124         results.current_page, '%stimes.page_load_time' % chart_name_prefix,
 125         'ms', tab.EvaluateJavaScript('__pc_load_time'),
 126         description='Average page load time. Measured from '
 127                     'performance.timing.navigationStart until the completion '
 128                     'time of a layout after the window.load event. Cold times '
 129                     'are the times when the page is loaded cold, i.e. without '
 130                     'loading it before, and warm times are times when the '
 131                     'page is loaded after being loaded previously.'))
 132
 133     self._has_loaded_page[page.url] += 1
 134
 135     self._power_metric.Stop(page, tab)
 136     self._memory_metric.Stop(page, tab)
 137     self._memory_metric.AddResults(tab, results)
 138     self._power_metric.AddResults(tab, results)
 139
 140     self._cpu_metric.Stop(page, tab)
 141     self._cpu_metric.AddResults(tab, results)
 142     if self._record_v8_object_stats:
 143       self._v8_object_stats_metric.Stop(page, tab)
 144       self._v8_object_stats_metric.AddResults(tab, results)
 145
 146     if self._report_speed_index:
 147       def SpeedIndexIsFinished():
 148         return self._speedindex_metric.IsFinished(tab)
 149       util.WaitFor(SpeedIndexIsFinished, 60)
 150       self._speedindex_metric.Stop(page, tab)
 151       self._speedindex_metric.AddResults(
 152           tab, results, chart_name=chart_name_prefix+'speed_index')
 153     keychain_metric.KeychainMetric().AddResults(tab, results)
 154
 155   def IsRunCold(self, url):
 156     return (self.ShouldRunCold(url) or
 157             self._has_loaded_page[url] == 0)
 158
 159   def ShouldRunCold(self, url):
 160     # We do the warm runs first for two reasons.  The first is so we can
 161     # preserve any initial profile cache for as long as possible.
 162     # The second is that, if we did cold runs first, we'd have a transition
 163     # page set during which we wanted the run for each URL to both
 164     # contribute to the cold data and warm the catch for the following
 165     # warm run, and clearing the cache before the load of the following
 166     # URL would eliminate the intended warmup for the previous URL.
 167     return (self._has_loaded_page[url] >= self._cold_run_start_index)