tools/perf/measurements/page_cycler.py - Issue 394953002: {Csv,Block}PageMeasurementResults no longer perform streaming output.

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Issue 394953002: {Csv,Block}PageMeasurementResults no longer perform streaming output. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master

Patch Set: Rebase again (!!) Created 6 years, 4 months ago

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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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164	164

165 def ShouldRunCold(self, url):	165 def ShouldRunCold(self, url):

166 # We do the warm runs first for two reasons. The first is so we can	166 # We do the warm runs first for two reasons. The first is so we can

167 # preserve any initial profile cache for as long as possible.	167 # preserve any initial profile cache for as long as possible.

168 # The second is that, if we did cold runs first, we'd have a transition	168 # The second is that, if we did cold runs first, we'd have a transition

169 # page set during which we wanted the run for each URL to both	169 # page set during which we wanted the run for each URL to both

170 # contribute to the cold data and warm the catch for the following	170 # contribute to the cold data and warm the catch for the following

171 # warm run, and clearing the cache before the load of the following	171 # warm run, and clearing the cache before the load of the following

172 # URL would eliminate the intended warmup for the previous URL.	172 # URL would eliminate the intended warmup for the previous URL.

173 return (self._has_loaded_page[url] >= self._cold_run_start_index)	173 return (self._has_loaded_page[url] >= self._cold_run_start_index)

174

175 def results_are_the_same_on_every_page(self):

176 return False

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