tools/perf/measurements/draw_properties.py

   1 # Copyright 2015 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 from telemetry.timeline import model
   7 from telemetry.timeline import tracing_category_filter
   8 from telemetry.timeline import tracing_options
   9 from telemetry.value import scalar
  10
  11
  12 class DrawProperties(page_test.PageTest):
  13   def __init__(self):
  14     super(DrawProperties, self).__init__()
  15
  16   def CustomizeBrowserOptions(self, options):
  17     options.AppendExtraBrowserArgs([
  18         '--enable-prefer-compositing-to-lcd-text',
  19     ])
  20
  21   def WillNavigateToPage(self, page, tab):
  22     options = tracing_options.TracingOptions()
  23     options.enable_chrome_trace = True
  24     category_filter = tracing_category_filter.TracingCategoryFilter(
  25         'disabled-by-default-cc.debug.cdp-perf')
  26     tab.browser.platform.tracing_controller.Start(options, category_filter)
  27
  28   def ComputeAverageOfDurations(self, timeline_model, name):
  29     events = timeline_model.GetAllEventsOfName(name)
  30     event_durations = [d.duration for d in events]
  31     assert event_durations, 'Failed to find durations'
  32
  33     duration_sum = sum(event_durations)
  34     duration_count = len(event_durations)
  35     duration_avg = duration_sum / duration_count
  36     return duration_avg
  37
  38   def ValidateAndMeasurePage(self, page, tab, results):
  39     timeline_data = tab.browser.platform.tracing_controller.Stop()
  40     timeline_model = model.TimelineModel(timeline_data)
  41
  42     pt_avg = self.ComputeAverageOfDurations(
  43         timeline_model,
  44         'LayerTreeHostCommon::ComputeVisibleRectsWithPropertyTrees')
  45
  46     results.AddValue(scalar.ScalarValue(
  47         results.current_page, 'PT_avg_cost', 'ms', pt_avg,
  48         description='Average time spent processing property trees'))
  49
  50   def DidRunPage(self, platform):
  51     tracing_controller = platform.tracing_controller
  52     if tracing_controller.is_tracing_running:
  53       tracing_controller.Stop()