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| 1 | |
| 2 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> | |
| 3 <html><head><title>Python: module telemetry.web_perf.metrics.smoothness</title> | |
| 4 <meta charset="utf-8"> | |
| 5 </head><body bgcolor="#f0f0f8"> | |
| 6 | |
| 7 <table width="100%" cellspacing=0 cellpadding=2 border=0 summary="heading"> | |
| 8 <tr bgcolor="#7799ee"> | |
| 9 <td valign=bottom> <br> | |
| 10 <font color="#ffffff" face="helvetica, arial"> <br><big><big><strong><a hre
f="telemetry.html"><font color="#ffffff">telemetry</font></a>.<a href="telemetry
.web_perf.html"><font color="#ffffff">web_perf</font></a>.<a href="telemetry.web
_perf.metrics.html"><font color="#ffffff">metrics</font></a>.smoothness</strong>
</big></big></font></td | |
| 11 ><td align=right valign=bottom | |
| 12 ><font color="#ffffff" face="helvetica, arial"><a href=".">index</a><br><a href=
"../telemetry/web_perf/metrics/smoothness.py">telemetry/web_perf/metrics/smoothn
ess.py</a></font></td></tr></table> | |
| 13 <p><tt># Copyright 2014 The Chromium Authors.
All rights reserved.<br> | |
| 14 # Use of this source code is governed by
a BSD-style license that can be<br> | |
| 15 # found in the LICENSE file.</tt></p> | |
| 16 <p> | |
| 17 <table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section"> | |
| 18 <tr bgcolor="#aa55cc"> | |
| 19 <td colspan=3 valign=bottom> <br> | |
| 20 <font color="#ffffff" face="helvetica, arial"><big><strong>Modules</strong></big
></font></td></tr> | |
| 21 | |
| 22 <tr><td bgcolor="#aa55cc"><tt> </tt></td><td>
</td> | |
| 23 <td width="100%"><table width="100%" summary="list"><tr><td width="25%" valign=t
op><a href="telemetry.value.improvement_direction.html">telemetry.value.improvem
ent_direction</a><br> | |
| 24 <a href="telemetry.value.list_of_scalar_values.html">telemetry.value.list_of_sca
lar_values</a><br> | |
| 25 </td><td width="25%" valign=top><a href="logging.html">logging</a><br> | |
| 26 <a href="telemetry.util.perf_tests_helper.html">telemetry.util.perf_tests_helper
</a><br> | |
| 27 </td><td width="25%" valign=top><a href="telemetry.web_perf.metrics.rendering_st
ats.html">telemetry.web_perf.metrics.rendering_stats</a><br> | |
| 28 <a href="telemetry.value.scalar.html">telemetry.value.scalar</a><br> | |
| 29 </td><td width="25%" valign=top><a href="telemetry.util.statistics.html">telemet
ry.util.statistics</a><br> | |
| 30 <a href="telemetry.web_perf.metrics.timeline_based_metric.html">telemetry.web_pe
rf.metrics.timeline_based_metric</a><br> | |
| 31 </td></tr></table></td></tr></table><p> | |
| 32 <table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section"> | |
| 33 <tr bgcolor="#ee77aa"> | |
| 34 <td colspan=3 valign=bottom> <br> | |
| 35 <font color="#ffffff" face="helvetica, arial"><big><strong>Classes</strong></big
></font></td></tr> | |
| 36 | |
| 37 <tr><td bgcolor="#ee77aa"><tt> </tt></td><td>
</td> | |
| 38 <td width="100%"><dl> | |
| 39 <dt><font face="helvetica, arial"><a href="telemetry.web_perf.metrics.timeline_b
ased_metric.html#TimelineBasedMetric">telemetry.web_perf.metrics.timeline_based_
metric.TimelineBasedMetric</a>(<a href="__builtin__.html#object">__builtin__.obj
ect</a>) | |
| 40 </font></dt><dd> | |
| 41 <dl> | |
| 42 <dt><font face="helvetica, arial"><a href="telemetry.web_perf.metrics.smoothness
.html#SmoothnessMetric">SmoothnessMetric</a> | |
| 43 </font></dt></dl> | |
| 44 </dd> | |
| 45 </dl> | |
| 46 <p> | |
| 47 <table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section"> | |
| 48 <tr bgcolor="#ffc8d8"> | |
| 49 <td colspan=3 valign=bottom> <br> | |
| 50 <font color="#000000" face="helvetica, arial"><a name="SmoothnessMetric">class <
strong>SmoothnessMetric</strong></a>(<a href="telemetry.web_perf.metrics.timelin
e_based_metric.html#TimelineBasedMetric">telemetry.web_perf.metrics.timeline_bas
ed_metric.TimelineBasedMetric</a>)</font></td></tr> | |
| 51 | |
| 52 <tr bgcolor="#ffc8d8"><td rowspan=2><tt> </tt></td> | |
| 53 <td colspan=2><tt>Computes metrics that measure smoothness&n
bsp;of animations over given ranges.<br> | |
| 54 <br> | |
| 55 Animations are typically considered smooth if the&
nbsp;frame rates are close to<br> | |
| 56 60 frames per second (fps) and uniformly dist
ributed over the sequence. To<br> | |
| 57 determine if a timeline range contains a smoo
th animation, we update the<br> | |
| 58 results object with several representative metrics:<br> | |
| 59 <br> | |
| 60 frame_times: A list of raw frame times
<br> | |
| 61 mean_frame_time: The arithmetic mean of fra
me times<br> | |
| 62 percentage_smooth: Percentage of frames that&nbs
p;were hitting 60 FPS.<br> | |
| 63 frame_time_discrepancy: The absolute discrepancy 
;of frame timestamps<br> | |
| 64 mean_pixels_approximated: The mean percentage of
pixels approximated<br> | |
| 65 queueing_durations: The queueing delay between&n
bsp;compositor & main threads<br> | |
| 66 <br> | |
| 67 Note that if any of the interaction records&n
bsp;provided to AddResults have less<br> | |
| 68 than 2 frames, we will return telemetry value
s with None values for each of<br> | |
| 69 the smoothness metrics. Similarly, older browsers
without support for<br> | |
| 70 tracking the BeginMainFrame events will report a&n
bsp;ListOfScalarValues with a<br> | |
| 71 None value for the queueing duration metric.<br>&n
bsp;</tt></td></tr> | |
| 72 <tr><td> </td> | |
| 73 <td width="100%"><dl><dt>Method resolution order:</dt> | |
| 74 <dd><a href="telemetry.web_perf.metrics.smoothness.html#SmoothnessMetric">Smooth
nessMetric</a></dd> | |
| 75 <dd><a href="telemetry.web_perf.metrics.timeline_based_metric.html#TimelineBased
Metric">telemetry.web_perf.metrics.timeline_based_metric.TimelineBasedMetric</a>
</dd> | |
| 76 <dd><a href="__builtin__.html#object">__builtin__.object</a></dd> | |
| 77 </dl> | |
| 78 <hr> | |
| 79 Methods defined here:<br> | |
| 80 <dl><dt><a name="SmoothnessMetric-AddResults"><strong>AddResults</strong></a>(se
lf, model, renderer_thread, interaction_records, results)</dt></dl> | |
| 81 | |
| 82 <dl><dt><a name="SmoothnessMetric-__init__"><strong>__init__</strong></a>(self)<
/dt></dl> | |
| 83 | |
| 84 <hr> | |
| 85 Methods inherited from <a href="telemetry.web_perf.metrics.timeline_based_metric
.html#TimelineBasedMetric">telemetry.web_perf.metrics.timeline_based_metric.Time
lineBasedMetric</a>:<br> | |
| 86 <dl><dt><a name="SmoothnessMetric-AddWholeTraceResults"><strong>AddWholeTraceRes
ults</strong></a>(self, model, results)</dt><dd><tt>Computes and adds&
nbsp;metrics corresponding to the entire trace.<br> | |
| 87 <br> | |
| 88 Override this method to compute results that
correspond to the whole trace.<br> | |
| 89 <br> | |
| 90 Args:<br> | |
| 91 model: An instance of telemetry.timeline.model.T
imelineModel.<br> | |
| 92 results: An instance of page.PageTestResults.</t
t></dd></dl> | |
| 93 | |
| 94 <dl><dt><a name="SmoothnessMetric-VerifyNonOverlappedRecords"><strong>VerifyNonO
verlappedRecords</strong></a>(self, interaction_records)</dt><dd><tt>This r
aises exceptions if interaction_records contain overlap
ped ranges.</tt></dd></dl> | |
| 95 | |
| 96 <hr> | |
| 97 Data descriptors inherited from <a href="telemetry.web_perf.metrics.timeline_bas
ed_metric.html#TimelineBasedMetric">telemetry.web_perf.metrics.timeline_based_me
tric.TimelineBasedMetric</a>:<br> | |
| 98 <dl><dt><strong>__dict__</strong></dt> | |
| 99 <dd><tt>dictionary for instance variables (if defined)<
/tt></dd> | |
| 100 </dl> | |
| 101 <dl><dt><strong>__weakref__</strong></dt> | |
| 102 <dd><tt>list of weak references to the object 
;(if defined)</tt></dd> | |
| 103 </dl> | |
| 104 </td></tr></table></td></tr></table><p> | |
| 105 <table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section"> | |
| 106 <tr bgcolor="#55aa55"> | |
| 107 <td colspan=3 valign=bottom> <br> | |
| 108 <font color="#ffffff" face="helvetica, arial"><big><strong>Data</strong></big></
font></td></tr> | |
| 109 | |
| 110 <tr><td bgcolor="#55aa55"><tt> </tt></td><td>
</td> | |
| 111 <td width="100%"><strong>NOT_ENOUGH_FRAMES_MESSAGE</strong> = "Not enough frames
for smoothness metrics (at lea...der extremely slow<font color="#c040c0">\n</fo
nt>- Pages that can't be scrolled"</td></tr></table> | |
| 112 </body></html> | |
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Chromium Code Reviews
Issue 1647513002:
Delete tools/telemetry. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master