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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 |
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146 # We do the warm runs first for two reasons. The first is so we can | 146 # We do the warm runs first for two reasons. The first is so we can |
147 # preserve any initial profile cache for as long as possible. | 147 # preserve any initial profile cache for as long as possible. |
148 # The second is that, if we did cold runs first, we'd have a transition | 148 # The second is that, if we did cold runs first, we'd have a transition |
149 # page set during which we wanted the run for each URL to both | 149 # page set during which we wanted the run for each URL to both |
150 # contribute to the cold data and warm the catch for the following | 150 # contribute to the cold data and warm the catch for the following |
151 # warm run, and clearing the cache before the load of the following | 151 # warm run, and clearing the cache before the load of the following |
152 # URL would eliminate the intended warmup for the previous URL. | 152 # URL would eliminate the intended warmup for the previous URL. |
153 return self._has_loaded_page[url] >= self._cold_run_start_index | 153 return self._has_loaded_page[url] >= self._cold_run_start_index |
154 | 154 |
155 def DidRunPage(self, platform): | 155 def DidRunPage(self, platform): |
| 156 del platform # unused |
156 self._power_metric.Close() | 157 self._power_metric.Close() |
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