1 # Copyright 2013 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. 4 5 from metrics import startup_metric 6 from telemetry.page import page_measurement 7 8 class Startup(page_measurement.PageMeasurement): 9 """Performs a measurement of Chromium's startup performance. 10 11 This test must be invoked with either --warm or --cold on the command line. A 12 cold start means none of the Chromium files are in the disk cache. A warm 13 start assumes the OS has already cached much of Chromium's content. For warm 14 tests, you should repeat the page set to ensure it's cached. 15 """ 16 17 def __init__(self): 18 super(Startup, self).__init__(needs_browser_restart_after_each_run=True) 19 20 def AddCommandLineOptions(self, parser): 21 parser.add_option('--cold', action='store_true', 22 help='Clear the OS disk cache before performing the test') 23 parser.add_option('--warm', action='store_true', 24 help='Start up with everything already cached') 25 26 def CustomizeBrowserOptions(self, options): 27 # TODO: Once the bots start running benchmarks, enforce that either --warm 28 # or --cold is explicitly specified. 29 # assert options.warm != options.cold, \ 30 # "You must specify either --warm or --cold" 31 if options.cold: 32 browser_options = options.browser_options 33 browser_options.clear_sytem_cache_for_browser_and_profile_on_start = True 34 else: 35 self.discard_first_result = True 36 37 options.AppendExtraBrowserArgs([ 38 '--enable-stats-collection-bindings' 39 ]) 40 41 def RunNavigateSteps(self, page, tab): 42 # Overriden so that no page navigation occurs - startup to the NTP. 43 pass 44 45 def MeasurePage(self, page, tab, results): 46 startup_metric.StartupMetric().AddResults(tab, results) 47
