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1 # Copyright 2012 The Chromium Authors. All rights reserved. | 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 | 2 # Use of this source code is governed by a BSD-style license that can be |
3 # found in the LICENSE file. | 3 # found in the LICENSE file. |
4 | 4 |
5 """The page cycler measurement. | 5 """The page cycler measurement. |
6 | 6 |
7 This measurement registers a window load handler in which is forces a layout and | 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 | 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 | 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 | 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). | 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. | 12 This extra garbage collection time is not included in the measurement times. |
13 | 13 page_ |
nednguyen
2016/06/02 01:56:06
typo? :P
kouhei (in TOK)
2016/06/02 01:59:57
typo. Ack. Will fix and land
| |
14 Finally, various memory and IO statistics are gathered at the very end of | 14 Finally, various memory and IO statistics are gathered at the very end of |
15 cycling all pages. | 15 cycling all pages. |
16 """ | 16 """ |
17 | 17 |
18 import collections | 18 import collections |
19 import os | 19 import os |
20 | 20 |
21 from telemetry.core import util | 21 from telemetry.core import util |
22 from telemetry.page import legacy_page_test | 22 from telemetry.page import legacy_page_test |
23 from telemetry.value import scalar | 23 from telemetry.value import scalar |
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104 | 104 |
105 keychain_metric.KeychainMetric.CustomizeBrowserOptions(options) | 105 keychain_metric.KeychainMetric.CustomizeBrowserOptions(options) |
106 | 106 |
107 def ValidateAndMeasurePage(self, page, tab, results): | 107 def ValidateAndMeasurePage(self, page, tab, results): |
108 tab.WaitForJavaScriptExpression('__pc_load_time', 60) | 108 tab.WaitForJavaScriptExpression('__pc_load_time', 60) |
109 | 109 |
110 chart_name_prefix = ('cold_' if self.IsRunCold(page.url) else | 110 chart_name_prefix = ('cold_' if self.IsRunCold(page.url) else |
111 'warm_') | 111 'warm_') |
112 | 112 |
113 results.AddValue(scalar.ScalarValue( | 113 results.AddValue(scalar.ScalarValue( |
114 results.current_page, '%stimes-page_load_time' % chart_name_prefix, | |
115 'ms', tab.EvaluateJavaScript('__pc_load_time'), | |
116 description='Average page load time. Measured from ' | |
117 'performance.timing.navigationStart until the completion ' | |
118 'time of a layout after the window.load event. Cold times ' | |
119 'are the times when the page is loaded cold, i.e. without ' | |
120 'loading it before, and warm times are times when the ' | |
121 'page is loaded after being loaded previously.')) | |
122 results.AddValue(scalar.ScalarValue( | |
123 results.current_page, '%stimes-time_to_onload' % chart_name_prefix, | |
124 'ms', tab.EvaluateJavaScript('performance.timing.loadEventStart' | |
125 '- performance.timing.navigationStart'), | |
126 description='Time to onload. This is temporary metric to check that ' | |
127 'PCv1 and PCv2 emit similar results')) | |
128 | |
129 # TODO(kouhei): Remove below. crbug.com/616342 | |
130 results.AddValue(scalar.ScalarValue( | |
114 results.current_page, '%stimes.page_load_time' % chart_name_prefix, | 131 results.current_page, '%stimes.page_load_time' % chart_name_prefix, |
115 'ms', tab.EvaluateJavaScript('__pc_load_time'), | 132 'ms', tab.EvaluateJavaScript('__pc_load_time'), |
116 description='Average page load time. Measured from ' | 133 description='Average page load time. Measured from ' |
117 'performance.timing.navigationStart until the completion ' | 134 'performance.timing.navigationStart until the completion ' |
118 'time of a layout after the window.load event. Cold times ' | 135 'time of a layout after the window.load event. Cold times ' |
119 'are the times when the page is loaded cold, i.e. without ' | 136 'are the times when the page is loaded cold, i.e. without ' |
120 'loading it before, and warm times are times when the ' | 137 'loading it before, and warm times are times when the ' |
121 'page is loaded after being loaded previously.')) | 138 'page is loaded after being loaded previously.')) |
122 results.AddValue(scalar.ScalarValue( | 139 results.AddValue(scalar.ScalarValue( |
123 results.current_page, '%stimes.time_to_onload' % chart_name_prefix, | 140 results.current_page, '%stimes.time_to_onload' % chart_name_prefix, |
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153 # preserve any initial profile cache for as long as possible. | 170 # preserve any initial profile cache for as long as possible. |
154 # The second is that, if we did cold runs first, we'd have a transition | 171 # The second is that, if we did cold runs first, we'd have a transition |
155 # page set during which we wanted the run for each URL to both | 172 # page set during which we wanted the run for each URL to both |
156 # contribute to the cold data and warm the catch for the following | 173 # contribute to the cold data and warm the catch for the following |
157 # warm run, and clearing the cache before the load of the following | 174 # warm run, and clearing the cache before the load of the following |
158 # URL would eliminate the intended warmup for the previous URL. | 175 # URL would eliminate the intended warmup for the previous URL. |
159 return self._has_loaded_page[url] >= self._cold_run_start_index | 176 return self._has_loaded_page[url] >= self._cold_run_start_index |
160 | 177 |
161 def DidRunPage(self, platform): | 178 def DidRunPage(self, platform): |
162 self._power_metric.Close() | 179 self._power_metric.Close() |
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