75 lines
2.9 KiB
Python
75 lines
2.9 KiB
Python
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# Copyright 2013 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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import json
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from telemetry.page import page_measurement
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class Startup(page_measurement.PageMeasurement):
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"""Performs a measurement of Chromium's startup performance.
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This test must be invoked with either --warm or --cold on the command line. A
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cold start means none of the Chromium files are in the disk cache. A warm
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start assumes the OS has already cached much of Chromium's content. For warm
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tests, you should repeat the page set to ensure it's cached.
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"""
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HISTOGRAMS_TO_RECORD = {
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'messageloop_start_time' :
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'Startup.BrowserMessageLoopStartTimeFromMainEntry',
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'window_display_time' : 'Startup.BrowserWindowDisplay',
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'open_tabs_time' : 'Startup.BrowserOpenTabs'}
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def __init__(self):
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super(Startup, self).__init__(needs_browser_restart_after_each_run=True)
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self._cold = False
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def AddCommandLineOptions(self, parser):
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parser.add_option('--cold', action='store_true',
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help='Clear the OS disk cache before performing the test')
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parser.add_option('--warm', action='store_true',
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help='Start up with everything already cached')
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def CustomizeBrowserOptions(self, options):
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# TODO: Once the bots start running benchmarks, enforce that either --warm
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# or --cold is explicitly specified.
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# assert options.warm != options.cold, \
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# "You must specify either --warm or --cold"
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self._cold = options.cold
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if self._cold:
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options.clear_sytem_cache_for_browser_and_profile_on_start = True
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else:
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self.discard_first_result = True
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options.AppendExtraBrowserArg('--enable-stats-collection-bindings')
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# Old commandline flags used for reference builds.
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options.AppendExtraBrowserArg('--dom-automation')
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options.AppendExtraBrowserArg(
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'--reduce-security-for-dom-automation-tests')
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def MeasurePage(self, page, tab, results):
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# TODO(jeremy): Remove references to
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# domAutomationController.getBrowserHistogram when we update the reference
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# builds.
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get_histogram_js = ('(window.statsCollectionController ?'
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'statsCollectionController :'
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'domAutomationController).getBrowserHistogram("%s")')
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for display_name, histogram_name in self.HISTOGRAMS_TO_RECORD.iteritems():
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result = tab.EvaluateJavaScript(get_histogram_js % histogram_name)
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result = json.loads(result)
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measured_time = 0
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if 'sum' in result:
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# For all the histograms logged here, there's a single entry so sum
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# is the exact value for that entry.
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measured_time = result['sum']
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elif 'buckets' in result:
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measured_time = \
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(result['buckets'][0]['high'] + result['buckets'][0]['low']) / 2
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results.Add(display_name, 'ms', measured_time)
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