1# Copyright (c) 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
5import json
6import math
7import os
8
9from telemetry import test
10from telemetry.core import util
11from telemetry.page import page_measurement
12from telemetry.page import page_set
13
14
15def _GeometricMean(values):
16  """Compute a rounded geometric mean from an array of values."""
17  if not values:
18    return None
19  # To avoid infinite value errors, make sure no value is less than 0.001.
20  new_values = []
21  for value in values:
22    if value > 0.001:
23      new_values.append(value)
24    else:
25      new_values.append(0.001)
26  # Compute the sum of the log of the values.
27  log_sum = sum(map(math.log, new_values))
28  # Raise e to that sum over the number of values.
29  mean = math.pow(math.e, (log_sum / len(new_values)))
30  # Return the rounded mean.
31  return int(round(mean))
32
33
34SCORE_UNIT = 'score (bigger is better)'
35SCORE_TRACE_NAME = 'score'
36
37
38class DomPerfMeasurement(page_measurement.PageMeasurement):
39  @property
40  def results_are_the_same_on_every_page(self):
41    return False
42
43  def MeasurePage(self, page, tab, results):
44    try:
45      def _IsDone():
46        return tab.GetCookieByName('__domperf_finished') == '1'
47      util.WaitFor(_IsDone, 600, poll_interval=5)
48
49      data = json.loads(tab.EvaluateJavaScript('__domperf_result'))
50      for suite in data['BenchmarkSuites']:
51        # Skip benchmarks that we didn't actually run this time around.
52        if len(suite['Benchmarks']) or suite['score']:
53          results.Add(SCORE_TRACE_NAME, SCORE_UNIT,
54                      suite['score'], suite['name'], 'unimportant')
55    finally:
56      tab.EvaluateJavaScript('document.cookie = "__domperf_finished=0"')
57
58  def DidRunTest(self, tab, results):
59    # Now give the geometric mean as the total for the combined runs.
60    scores = []
61    for result in results.page_results:
62      scores.append(result[SCORE_TRACE_NAME].output_value)
63    total = _GeometricMean(scores)
64    results.AddSummary(SCORE_TRACE_NAME, SCORE_UNIT, total, 'Total')
65
66
67class DomPerf(test.Test):
68  """A suite of JavaScript benchmarks for exercising the browser's DOM.
69
70  The final score is computed as the geometric mean of the individual results.
71  Scores are not comparable across benchmark suite versions and higher scores
72  means better performance: Bigger is better!"""
73  test = DomPerfMeasurement
74
75  def CreatePageSet(self, options):
76    dom_perf_dir = os.path.join(util.GetChromiumSrcDir(), 'data', 'dom_perf')
77    base_page = 'file:///run.html?reportInJS=1&run='
78    return page_set.PageSet.FromDict({
79        'pages': [
80          { 'url': base_page + 'Accessors' },
81          { 'url': base_page + 'CloneNodes' },
82          { 'url': base_page + 'CreateNodes' },
83          { 'url': base_page + 'DOMDivWalk' },
84          { 'url': base_page + 'DOMTable' },
85          { 'url': base_page + 'DOMWalk' },
86          { 'url': base_page + 'Events' },
87          { 'url': base_page + 'Get+Elements' },
88          { 'url': base_page + 'GridSort' },
89          { 'url': base_page + 'Template' }
90          ]
91        }, dom_perf_dir)
92