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 import os 6 import tempfile 7 8 from metrics import loading 9 from telemetry.core.platform.profiler import perf_profiler 10 from telemetry.page import page_measurement 11 12 class LoadingProfile(page_measurement.PageMeasurement): 13 options = {'page_repeat': 2} 14 15 def __init__(self): 16 super(LoadingProfile, self).__init__(discard_first_result=True) 17 18 @property 19 def results_are_the_same_on_every_page(self): 20 return False 21 22 def CustomizeBrowserOptions(self, options): 23 if not perf_profiler.PerfProfiler.is_supported(browser_type='any'): 24 raise Exception('This measurement is not supported on this platform') 25 26 perf_profiler.PerfProfiler.CustomizeBrowserOptions( 27 browser_type='any', options=options) 28 29 def WillNavigateToPage(self, page, tab): 30 tab.browser.StartProfiling(perf_profiler.PerfProfiler.name(), 31 os.path.join(tempfile.mkdtemp(), 32 page.file_safe_name)) 33 34 def MeasurePage(self, page, tab, results): 35 # In current telemetry tests, all tests wait for DocumentComplete state, 36 # but we need to wait for the load event. 37 tab.WaitForJavaScriptExpression('performance.timing.loadEventStart', 300) 38 39 profile_files = tab.browser.StopProfiling() 40 41 loading.LoadingMetric().AddResults(tab, results) 42 43 profile_file = None 44 for profile_file in profile_files: 45 if 'renderer' in profile_file: 46 break 47 48 for function, period in perf_profiler.PerfProfiler.GetTopSamples( 49 profile_file, 10).iteritems(): 50 results.Add(function.replace('.', '_'), 'period', period) 51
