def testArithmeticMean(self): # The ArithmeticMean function computes the simple average. self.assertAlmostEquals(40/3.0, statistics.ArithmeticMean([10, 10, 20], 3)) self.assertAlmostEquals(15.0, statistics.ArithmeticMean([10, 20], 2)) # Both lists of values or single values can be given for either argument. self.assertAlmostEquals(40/3.0, statistics.ArithmeticMean(40, [1, 1, 1])) # If the 'count' is zero, then zero is returned. self.assertEquals(0, statistics.ArithmeticMean(4.0, 0)) self.assertEquals(0, statistics.ArithmeticMean(4.0, []))
def AddResults(self, tab, results):
if self._stats.mouse_wheel_scroll_latency:
mean_mouse_wheel_scroll_latency = statistics.ArithmeticMean(
self._stats.mouse_wheel_scroll_latency,
len(self._stats.mouse_wheel_scroll_latency))
results.Add('mean_mouse_wheel_scroll_latency', 'ms',
round(mean_mouse_wheel_scroll_latency, 3))
if self._stats.touch_scroll_latency:
mean_touch_scroll_latency = statistics.ArithmeticMean(
self._stats.touch_scroll_latency,
len(self._stats.touch_scroll_latency))
results.Add('mean_touch_scroll_latency', 'ms',
round(mean_touch_scroll_latency, 3))
if self._stats.js_touch_scroll_latency:
mean_js_touch_scroll_latency = statistics.ArithmeticMean(
self._stats.js_touch_scroll_latency,
len(self._stats.js_touch_scroll_latency))
results.Add('mean_js_touch_scroll_latency', 'ms',
round(mean_js_touch_scroll_latency, 3))
# List of raw frame times.
frame_times = FlattenList(self._stats.frame_times)
results.Add('frame_times', 'ms', frame_times)
# Arithmetic mean of frame times.
mean_frame_time = statistics.ArithmeticMean(frame_times,
len(frame_times))
results.Add('mean_frame_time', 'ms', round(mean_frame_time, 3))
# Absolute discrepancy of frame time stamps.
jank = statistics.FrameDiscrepancy(self._stats.frame_timestamps)
results.Add('jank', '', round(jank, 4))
# Are we hitting 60 fps for 95 percent of all frames?
# We use 19ms as a somewhat looser threshold, instead of 1000.0/60.0.
percentile_95 = statistics.Percentile(frame_times, 95.0)
results.Add('mostly_smooth', 'score',
1.0 if percentile_95 < 19.0 else 0.0)
if tab.browser.platform.IsRawDisplayFrameRateSupported():
for r in tab.browser.platform.GetRawDisplayFrameRateMeasurements():
if r.value is None:
raise MissingDisplayFrameRateError(r.name)
results.Add(r.name, r.unit, r.value)
def AddResults(self, tab, results):
# List of raw frame times.
results.Add('frame_times', 'ms', self._stats.frame_times)
# Arithmetic mean of frame times.
mean_frame_time = statistics.ArithmeticMean(self._stats.frame_times,
len(self._stats.frame_times))
results.Add('mean_frame_time', 'ms', round(mean_frame_time, 3))
# Absolute discrepancy of frame time stamps.
jank = statistics.FrameDiscrepancy(self._stats.frame_timestamps)
results.Add('jank', '', round(jank, 4))
# Are we hitting 60 fps for 95 percent of all frames? (Boolean value)
# We use 17ms as a slightly looser threshold, instead of 1000.0/60.0.
results.Add('mostly_smooth', '',
statistics.Percentile(self._stats.frame_times, 95.0) < 17.0)