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 telemetry.page import page_test
   6
   7 from metrics import keychain_metric
   8 from metrics import startup_metric
   9
  10
  11 class Startup(page_test.PageTest):
  12   """Performs a measurement of Chromium's startup performance.
  13
  14   Uses cold start if cold==True, otherwise uses warm start. A cold start means
  15   none of the Chromium files are in the disk cache. A warm start assumes the OS
  16   has already cached much of Chromium's content. For warm tests, you should
  17   repeat the page set to ensure it's cached.
  18   """
  19
  20   def __init__(self, cold=False):
  21     super(Startup, self).__init__(needs_browser_restart_after_each_page=True)
  22     self._cold = cold
  23
  24   def CustomizeBrowserOptions(self, options):
  25     if self._cold:
  26       options.clear_sytem_cache_for_browser_and_profile_on_start = True
  27     options.AppendExtraBrowserArgs([
  28         '--enable-stats-collection-bindings'
  29     ])
  30     keychain_metric.KeychainMetric.CustomizeBrowserOptions(options)
  31
  32   def ValidateAndMeasurePage(self, page, tab, results):
  33     keychain_metric.KeychainMetric().AddResults(tab, results)
  34     startup_metric.StartupMetric().AddResults(tab, results)
  35
  36
  37 class StartWithUrl(Startup):
  38   """Performs a measurement of Chromium's performance starting with a URL.
  39
  40   Uses cold start if cold==True, otherwise uses warm start. A cold start means
  41   none of the Chromium files are in the disk cache. A warm start assumes the OS
  42   has already cached much of Chromium's content. For warm tests, you should
  43   repeat the page set to ensure it's cached.
  44
  45   The startup URL is taken from the page's startup_url. This
  46   allows the testing of multiple different URLs in a single benchmark.
  47   """
  48
  49   def __init__(self, cold=False):
  50     super(StartWithUrl, self).__init__(cold=cold)