1 # Copyright (c) 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.
5 """The page cycler measurement.
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.
14 Finally, various memory and IO statistics are gathered at the very end of
21 from metrics import cpu
22 from metrics import io
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_measurement
30 class PageCycler(page_measurement.PageMeasurement):
31 def __init__(self, *args, **kwargs):
32 super(PageCycler, self).__init__(*args, **kwargs)
34 with open(os.path.join(os.path.dirname(__file__),
35 'page_cycler.js'), 'r') as f:
36 self._page_cycler_js = f.read()
38 self._record_v8_object_stats = False
39 self._report_speed_index = False
40 self._speedindex_metric = speedindex.SpeedIndexMetric()
41 self._memory_metric = None
42 self._power_metric = power.PowerMetric()
43 self._cpu_metric = None
44 self._v8_object_stats_metric = None
45 self._cold_run_start_index = None
46 self._has_loaded_page = collections.defaultdict(int)
48 def AddCommandLineOptions(self, parser):
49 # The page cyclers should default to 10 iterations. In order to change the
50 # default of an option, we must remove and re-add it.
51 # TODO: Remove this after transition to run_benchmark.
52 pageset_repeat_option = parser.get_option('--pageset-repeat')
53 pageset_repeat_option.default = 10
54 parser.remove_option('--pageset-repeat')
55 parser.add_option(pageset_repeat_option)
57 parser.add_option('--v8-object-stats',
59 help='Enable detailed V8 object statistics.')
61 parser.add_option('--report-speed-index',
63 help='Enable the speed index metric.')
65 parser.add_option('--cold-load-percent', type='int',
66 help='%d of page visits for which a cold load is forced')
68 def DidStartBrowser(self, browser):
69 """Initialize metrics once right after the browser has been launched."""
70 self._memory_metric = memory.MemoryMetric(browser)
71 self._cpu_metric = cpu.CpuMetric(browser)
72 if self._record_v8_object_stats:
73 self._v8_object_stats_metric = v8_object_stats.V8ObjectStatsMetric()
75 def DidStartHTTPServer(self, tab):
76 # Avoid paying for a cross-renderer navigation on the first page on legacy
77 # page cyclers which use the filesystem.
78 tab.Navigate(tab.browser.http_server.UrlOf('nonexistent.html'))
80 def WillNavigateToPage(self, page, tab):
81 page.script_to_evaluate_on_commit = self._page_cycler_js
82 if self.ShouldRunCold(page.url):
83 tab.ClearCache(force=True)
84 if self._report_speed_index:
85 self._speedindex_metric.Start(page, tab)
87 def DidNavigateToPage(self, page, tab):
88 self._memory_metric.Start(page, tab)
89 self._power_metric.Start(page, tab)
90 # TODO(qyearsley): Uncomment the following line and move it to
91 # WillNavigateToPage once the cpu metric has been changed.
92 # This is being temporarily commented out to let the page cycler
93 # results return to how they were before the cpu metric was added.
94 # self._cpu_metric.Start(page, tab) See crbug.com/301714.
95 if self._record_v8_object_stats:
96 self._v8_object_stats_metric.Start(page, tab)
98 def CustomizeBrowserOptions(self, options):
99 memory.MemoryMetric.CustomizeBrowserOptions(options)
100 power.PowerMetric.CustomizeBrowserOptions(options)
101 io.IOMetric.CustomizeBrowserOptions(options)
102 options.AppendExtraBrowserArgs('--js-flags=--expose_gc')
104 if options.v8_object_stats:
105 self._record_v8_object_stats = True
106 v8_object_stats.V8ObjectStatsMetric.CustomizeBrowserOptions(options)
108 if options.report_speed_index:
109 self._report_speed_index = True
110 self._speedindex_metric.CustomizeBrowserOptions(options)
112 cold_runs_percent_set = (options.cold_load_percent != None)
113 # Handle requests for cold cache runs
114 if (cold_runs_percent_set and
115 (options.repeat_options.page_repeat_secs or
116 options.repeat_options.pageset_repeat_secs)):
117 raise Exception('--cold-load-percent is incompatible with timed repeat')
119 if (cold_runs_percent_set and
120 (options.cold_load_percent < 0 or options.cold_load_percent > 100)):
121 raise Exception('--cold-load-percent must be in the range [0-100]')
123 # Make sure _cold_run_start_index is an integer multiple of page_repeat.
124 # Without this, --pageset_shuffle + --page_repeat could lead to
125 # assertion failures on _started_warm in WillNavigateToPage.
126 if cold_runs_percent_set:
127 number_warm_pageset_runs = int(
128 (int(options.repeat_options.pageset_repeat_iters) - 1) *
129 (100 - options.cold_load_percent) / 100)
130 number_warm_runs = (number_warm_pageset_runs *
131 options.repeat_options.page_repeat_iters)
132 self._cold_run_start_index = (number_warm_runs +
133 options.repeat_options.page_repeat_iters)
134 self.discard_first_result = (not options.cold_load_percent or
135 self.discard_first_result)
137 self._cold_run_start_index = (
138 options.repeat_options.pageset_repeat_iters *
139 options.repeat_options.page_repeat_iters)
141 def MeasurePage(self, page, tab, results):
142 tab.WaitForJavaScriptExpression('__pc_load_time', 60)
144 chart_name_prefix = ('cold_' if self.IsRunCold(page.url) else
147 results.Add('page_load_time', 'ms',
148 int(float(tab.EvaluateJavaScript('__pc_load_time'))),
149 chart_name=chart_name_prefix+'times')
151 self._has_loaded_page[page.url] += 1
153 self._power_metric.Stop(page, tab)
154 self._memory_metric.Stop(page, tab)
155 self._memory_metric.AddResults(tab, results)
156 self._power_metric.AddResults(tab, results)
158 # TODO(qyearsley): Uncomment the following line when CPU metric is
159 # changed. See crbug.com/301714.
160 # self._cpu_metric.Stop(page, tab)
161 # self._cpu_metric.AddResults(tab, results)
162 if self._record_v8_object_stats:
163 self._v8_object_stats_metric.Stop(page, tab)
164 self._v8_object_stats_metric.AddResults(tab, results)
166 if self._report_speed_index:
167 def SpeedIndexIsFinished():
168 return self._speedindex_metric.IsFinished(tab)
169 util.WaitFor(SpeedIndexIsFinished, 60)
170 self._speedindex_metric.Stop(page, tab)
171 self._speedindex_metric.AddResults(
172 tab, results, chart_name=chart_name_prefix+'speed_index')
174 def DidRunTest(self, browser, results):
175 io.IOMetric().AddSummaryResults(browser, results)
177 def IsRunCold(self, url):
178 return (self.ShouldRunCold(url) or
179 self._has_loaded_page[url] == 0)
181 def ShouldRunCold(self, url):
182 # We do the warm runs first for two reasons. The first is so we can
183 # preserve any initial profile cache for as long as possible.
184 # The second is that, if we did cold runs first, we'd have a transition
185 # page set during which we wanted the run for each URL to both
186 # contribute to the cold data and warm the catch for the following
187 # warm run, and clearing the cache before the load of the following
188 # URL would eliminate the intended warmup for the previous URL.
189 return (self._has_loaded_page[url] >= self._cold_run_start_index)
191 def results_are_the_same_on_every_page(self):