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<!DOCTYPE html>
<!--
Copyright (c) 2015 The Chromium Authors. All rights reserved.
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->
<link rel="import" href="/tracing/base/statistics.html">
<link rel="import" href="/tracing/metrics/metric_registry.html">
<link rel="import" href="/tracing/metrics/system_health/utils.html">
<link rel="import" href="/tracing/model/user_model/animation_expectation.html">
<link rel="import" href="/tracing/model/user_model/load_expectation.html">
<link rel="import" href="/tracing/model/user_model/response_expectation.html">
<link rel="import" href="/tracing/value/numeric.html">
<link rel="import" href="/tracing/value/value.html">
<script>
'use strict';
tr.exportTo('tr.metrics.sh', function() {
// In the case of Response, Load, and DiscreteAnimation IRs, Responsiveness is
// derived from the time between when the user thinks they begin an interation
// (expectedStart) and the time when the screen first changes to reflect the
// interaction (actualEnd). There may be a delay between expectedStart and
// when chrome first starts processing the interaction (actualStart) if the
// main thread is busy. The user doesn't know when actualStart is, they only
// know when expectedStart is. User responsiveness, by definition, considers
// only what the user experiences, so "duration" is defined as actualEnd -
// expectedStart.
function computeAnimationThroughput(animationExpectation) {
if (animationExpectation.frameEvents === undefined ||
animationExpectation.frameEvents.length === 0)
throw new Error('Animation missing frameEvents ' +
animationExpectation.stableId);
var durationSeconds = animationExpectation.duration / 1000;
return animationExpectation.frameEvents.length / durationSeconds;
}
function computeAnimationframeTimeDiscrepancy(animationExpectation) {
if (animationExpectation.frameEvents === undefined ||
animationExpectation.frameEvents.length === 0)
throw new Error('Animation missing frameEvents ' +
animationExpectation.stableId);
var frameTimestamps = animationExpectation.frameEvents;
frameTimestamps = frameTimestamps.toArray().map(function(event) {
return event.start;
});
var absolute = false;
return tr.b.Statistics.timestampsDiscrepancy(frameTimestamps, absolute);
}
var RESPONSE_NUMERIC_BUILDER = tr.v.NumericBuilder.createLinear(
tr.v.Unit.byName.timeDurationInMs_smallerIsBetter,
tr.b.Range.fromExplicitRange(100, 1000), 90);
var THROUGHPUT_NUMERIC_BUILDER = tr.v.NumericBuilder.createLinear(
tr.v.Unit.byName.unitlessNumber_biggerIsBetter,
tr.b.Range.fromExplicitRange(10, 60), 10);
var DISCREPANCY_NUMERIC_BUILDER = tr.v.NumericBuilder.createLinear(
tr.v.Unit.byName.unitlessNumber_smallerIsBetter,
tr.b.Range.fromExplicitRange(0, 1), 50);
var LATENCY_NUMERIC_BUILDER = tr.v.NumericBuilder.createLinear(
tr.v.Unit.byName.timeDurationInMs_smallerIsBetter,
tr.b.Range.fromExplicitRange(0, 300), 60);
/**
* @param {!tr.v.ValueSet} values
* @param {!tr.model.Model} model
* @param {!Object=} opt_options
*/
function responsivenessMetric(values, model, opt_options) {
// TODO(benjhayden): Add categories to benchmark to support:
// tr.metrics.sh.firstPaintMetric(values, model);
var responseNumeric = RESPONSE_NUMERIC_BUILDER.build();
var throughputNumeric = THROUGHPUT_NUMERIC_BUILDER.build();
var frameTimeDiscrepancyNumeric = DISCREPANCY_NUMERIC_BUILDER.build();
var latencyNumeric = LATENCY_NUMERIC_BUILDER.build();
model.userModel.expectations.forEach(function(ue) {
if (opt_options && opt_options.rangeOfInterest &&
!opt_options.rangeOfInterest.intersectsExplicitRangeExclusive(
ue.start, ue.end))
return;
var sourceInfo = {userExpectationId: ue.stableId};
// Responsiveness is not defined for Idle.
if (ue instanceof tr.model.um.IdleExpectation) {
return;
} else if (ue instanceof tr.model.um.LoadExpectation) {
// This is already covered by firstPaintMetric.
} else if (ue instanceof tr.model.um.ResponseExpectation) {
responseNumeric.add(ue.duration, sourceInfo);
} else if (ue instanceof tr.model.um.AnimationExpectation) {
var throughput = computeAnimationThroughput(ue);
if (throughput === undefined)
throw new Error('Missing throughput for ' +
ue.stableId);
throughputNumeric.add(throughput, sourceInfo);
var frameTimeDiscrepancy = computeAnimationframeTimeDiscrepancy(ue);
if (frameTimeDiscrepancy === undefined)
throw new Error('Missing frameTimeDiscrepancy for ' +
ue.stableId);
frameTimeDiscrepancyNumeric.add(frameTimeDiscrepancy, sourceInfo);
ue.associatedEvents.forEach(function(event) {
if (!(event instanceof tr.e.cc.InputLatencyAsyncSlice))
return;
latencyNumeric.add(event.duration, sourceInfo);
});
} else {
throw new Error('Unrecognized stage for ' + ue.stableId);
}
});
[
responseNumeric, throughputNumeric, frameTimeDiscrepancyNumeric,
latencyNumeric
].forEach(function(numeric) {
numeric.customizeSummaryOptions({
avg: true,
max: true,
min: true,
std: true
});
});
values.addValue(new tr.v.NumericValue(
'response latency', responseNumeric));
values.addValue(new tr.v.NumericValue(
'animation throughput', throughputNumeric));
values.addValue(new tr.v.NumericValue(
'animation frameTimeDiscrepancy',
frameTimeDiscrepancyNumeric));
values.addValue(new tr.v.NumericValue(
'animation latency', latencyNumeric));
}
tr.metrics.MetricRegistry.register(responsivenessMetric, {
supportsRangeOfInterest: true
});
return {
responsivenessMetric: responsivenessMetric,
};
});
</script>
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