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_test
   7
   8
   9 class Startup(page_test.PageTest):
  10   """Performs a measurement of Chromium's startup performance.
  11
  12   Uses cold start if cold==True, otherwise uses warm start. A cold start means
  13   none of the Chromium files are in the disk cache. A warm start assumes the OS
  14   has already cached much of Chromium's content. For warm tests, you should
  15   repeat the page set to ensure it's cached.
  16   """
  17
  18   def __init__(self, cold=False, action_name_to_run=''):
  19     super(Startup, self).__init__(needs_browser_restart_after_each_page=True,
  20                                   action_name_to_run=action_name_to_run)
  21     self._cold = cold
  22
  23   def CustomizeBrowserOptions(self, options):
  24     if self._cold:
  25       options.clear_sytem_cache_for_browser_and_profile_on_start = True
  26     else:
  27       self.discard_first_result = True
  28
  29     options.AppendExtraBrowserArgs([
  30         '--enable-stats-collection-bindings'
  31     ])
  32
  33   def RunNavigateSteps(self, page, tab):
  34     # Overriden so that no page navigation occurs - startup to the NTP.
  35     pass
  36
  37   def ValidateAndMeasurePage(self, page, tab, results):
  38     startup_metric.StartupMetric().AddResults(tab, results)
  39
  40
  41 class StartWithUrl(Startup):
  42   """Performs a measurement of Chromium's performance starting with a URL.
  43
  44   Uses cold start if cold==True, otherwise uses warm start. A cold start means
  45   none of the Chromium files are in the disk cache. A warm start assumes the OS
  46   has already cached much of Chromium's content. For warm tests, you should
  47   repeat the page set to ensure it's cached.
  48
  49   The startup URL is taken from the page's startup_url. This
  50   allows the testing of multiple different URLs in a single benchmark.
  51   """
  52
  53   def __init__(self, cold=False):
  54     super(StartWithUrl, self).__init__(cold=cold,
  55                                        action_name_to_run='RunNavigateSteps')