tools/perf/measurements/startup.py

   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, action_name_to_run = ''):
  18     super(Startup, self).__init__(needs_browser_restart_after_each_run=True,
  19                                   action_name_to_run=action_name_to_run)
  20
  21   def AddCommandLineOptions(self, parser):
  22     parser.add_option('--cold', action='store_true',
  23                       help='Clear the OS disk cache before performing the test')
  24     parser.add_option('--warm', action='store_true',
  25                       help='Start up with everything already cached')
  26
  27   def CustomizeBrowserOptions(self, options):
  28     # TODO: Once the bots start running benchmarks, enforce that either --warm
  29     # or --cold is explicitly specified.
  30     # assert options.warm != options.cold, \
  31     #     "You must specify either --warm or --cold"
  32     if options.cold:
  33       browser_options = options.browser_options
  34       browser_options.clear_sytem_cache_for_browser_and_profile_on_start = True
  35     else:
  36       self.discard_first_result = True
  37
  38     options.AppendExtraBrowserArgs([
  39         '--enable-stats-collection-bindings'
  40     ])
  41
  42   def RunNavigateSteps(self, page, tab):
  43     # Overriden so that no page navigation occurs - startup to the NTP.
  44     pass
  45
  46   def MeasurePage(self, page, tab, results):
  47     startup_metric.StartupMetric().AddResults(tab, results)
  48
  49
  50 class StartWithUrl(Startup):
  51   """Performs a measurement of Chromium's performance starting with a URL.
  52
  53   This test must be invoked with either --warm or --cold on the command line. A
  54   cold start means none of the Chromium files are in the disk cache. A warm
  55   start assumes the OS has already cached much of Chromium's content. For warm
  56   tests, you should repeat the page set to ensure it's cached.
  57
  58   The startup URL is taken from the page set's set_startup_url action. This
  59   allows the testing of multiple different URLs in a single benchmark.
  60   """
  61
  62   def __init__(self):
  63     super(StartWithUrl, self).__init__(action_name_to_run='navigate_steps')