tools/perf/metrics/smoothness.py - Issue 268803002: re-land: telemetry: Add approximated pixels percentage to smoothness.

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Side by Side Diff: tools/perf/metrics/smoothness.py

Issue 268803002: re-land: telemetry: Add approximated pixels percentage to smoothness. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src

Patch Set: Created 6 years, 7 months ago

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1 # Copyright 2013 The Chromium Authors. All rights reserved.	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	2 # Use of this source code is governed by a BSD-style license that can be

3 # found in the LICENSE file.	3 # found in the LICENSE file.

4	4

5 from metrics import timeline_based_metric	5 from metrics import timeline_based_metric

6 from metrics import rendering_stats	6 from metrics import rendering_stats

7 from telemetry.page.perf_tests_helper import FlattenList	7 from telemetry.page.perf_tests_helper import FlattenList

8 from telemetry.util import statistics	8 from telemetry.util import statistics

9	9

10	10

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57	57

58 # Absolute discrepancy of frame time stamps.	58 # Absolute discrepancy of frame time stamps.

59 frame_discrepancy = statistics.TimestampsDiscrepancy(	59 frame_discrepancy = statistics.TimestampsDiscrepancy(

60 stats.frame_timestamps)	60 stats.frame_timestamps)

61 results.Add('jank', 'ms', round(frame_discrepancy, 4))	61 results.Add('jank', 'ms', round(frame_discrepancy, 4))

62	62

63 # Are we hitting 60 fps for 95 percent of all frames?	63 # Are we hitting 60 fps for 95 percent of all frames?

64 # We use 19ms as a somewhat looser threshold, instead of 1000.0/60.0.	64 # We use 19ms as a somewhat looser threshold, instead of 1000.0/60.0.

65 percentile_95 = statistics.Percentile(frame_times, 95.0)	65 percentile_95 = statistics.Percentile(frame_times, 95.0)

66 results.Add('mostly_smooth', 'score', 1.0 if percentile_95 < 19.0 else 0.0)	66 results.Add('mostly_smooth', 'score', 1.0 if percentile_95 < 19.0 else 0.0)

	67

	68 # Mean percentage of pixels approximated (missing tiles, low resolution

	69 # tiles, non-ideal resolution tiles)

	70 results.Add('mean_pixels_approximated', 'percent',

	71 round(statistics.ArithmeticMean(

	72 FlattenList(stats.approximated_pixel_percentages)), 3))

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