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<!DOCTYPE html>
<!--
Copyright 2016 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/range.html">
<link rel="import" href="/tracing/metrics/metric_registry.html">
<link rel="import" href="/tracing/metrics/v8/utils.html">
<link rel="import" href="/tracing/value/numeric.html">
<link rel="import" href="/tracing/value/unit.html">
<link rel="import" href="/tracing/value/value.html">
<script>
'use strict';
tr.exportTo('tr.metrics.v8', function() {
// The time window size for mutator utilization computation.
// It is equal to the duration of one frame corresponding to 60 FPS rendering.
var TARGET_FPS = 60;
var MS_PER_SECOND = 1000;
var WINDOW_SIZE_MS = MS_PER_SECOND / TARGET_FPS;
function gcMetric(values, model) {
addDurationOfTopEvents(values, model);
addTotalDurationOfTopEvents(values, model);
addDurationOfSubEvents(values, model);
addIdleTimesOfTopEvents(values, model);
addTotalIdleTimesOfTopEvents(values, model);
addV8ExecuteMutatorUtilization(values, model);
}
tr.metrics.MetricRegistry.register(gcMetric);
var timeDurationInMs_smallerIsBetter =
tr.v.Unit.byName.timeDurationInMs_smallerIsBetter;
var percentage_biggerIsBetter =
tr.v.Unit.byName.normalizedPercentage_biggerIsBetter;
var numericBuilder = new tr.v.NumericBuilder(
timeDurationInMs_smallerIsBetter, 0);
// 0.1 steps from 0 to 20 since it is the most common range.
numericBuilder.addLinearBins(20, 200);
// Exponentially increasing steps from 20 to 200.
numericBuilder.addExponentialBins(200, 100);
function createNumericForTopEventTime() {
var n = numericBuilder.build();
n.customizeSummaryOptions({
avg: true,
count: true,
max: true,
min: false,
std: true,
sum: true,
percentile: [0.90]});
return n;
}
function createNumericForSubEventTime() {
var n = numericBuilder.build();
n.customizeSummaryOptions({
avg: true,
count: false,
max: true,
min: false,
std: false,
sum: false,
percentile: [0.90]
});
return n;
}
function createNumericForIdleTime() {
var n = numericBuilder.build();
n.customizeSummaryOptions({
avg: true,
count: false,
max: true,
min: false,
std: false,
sum: true,
percentile: []
});
return n;
}
function createPercentage(numerator, denominator) {
var percentage = denominator === 0 ? 0 : numerator / denominator * 100;
return new tr.v.ScalarNumeric(percentage_biggerIsBetter, percentage);
}
/**
* Example output:
* - Animation-v8_gc_full_mark_compactor.
*/
function addDurationOfTopEvents(values, model) {
groupAndProcessEvents(model,
tr.metrics.v8.utils.isTopGarbageCollectionEvent,
tr.metrics.v8.utils.topGarbageCollectionEventName,
function(stageTitle, name, events) {
var cpuDuration = createNumericForTopEventTime();
events.forEach(function(event) {
cpuDuration.add(event.cpuDuration);
});
values.addValue(new tr.v.NumericValue(
stageTitle + '-' + name, cpuDuration));
}
);
}
/**
* Example output:
* - Animation:v8_gc_total
*/
function addTotalDurationOfTopEvents(values, model) {
groupAndProcessEvents(model,
tr.metrics.v8.utils.isTopGarbageCollectionEvent,
event => 'v8-gc-total',
function(stageTitle, name, events) {
var cpuDuration = createNumericForTopEventTime();
events.forEach(function(event) {
cpuDuration.add(event.cpuDuration);
});
values.addValue(new tr.v.NumericValue(
stageTitle + '-' + name, cpuDuration));
}
);
}
/**
* Example output:
* - Animation-v8-gc-full-mark-compactor-evacuate.
*/
function addDurationOfSubEvents(values, model) {
groupAndProcessEvents(model,
tr.metrics.v8.utils.isSubGarbageCollectionEvent,
tr.metrics.v8.utils.subGarbageCollectionEventName,
function(stageTitle, name, events) {
var cpuDuration = createNumericForSubEventTime();
events.forEach(function(event) {
cpuDuration.add(event.cpuDuration);
});
values.addValue(new tr.v.NumericValue(
stageTitle + '-' + name, cpuDuration));
}
);
}
/**
* Example output:
* - Animation-v8-gc-full-mark-compactor_idle_deadline_overrun,
* - Animation-v8-gc-full-mark-compactor_outside_idle,
* - Animation-v8-gc-full-mark-compactor_percentage_idle.
*/
function addIdleTimesOfTopEvents(values, model) {
groupAndProcessEvents(model,
tr.metrics.v8.utils.isTopGarbageCollectionEvent,
tr.metrics.v8.utils.topGarbageCollectionEventName,
function(stageTitle, name, events) {
addIdleTimes(values, model, stageTitle, name, events);
}
);
}
/**
* Example output:
* - Animation-v8-gc-total_idle_deadline_overrun,
* - Animation-v8-gc-total_outside_idle,
* - Animation-v8-gc-total_percentage_idle.
*/
function addTotalIdleTimesOfTopEvents(values, model) {
groupAndProcessEvents(model,
tr.metrics.v8.utils.isTopGarbageCollectionEvent,
event => 'v8-gc-total',
function(stageTitle, name, events) {
addIdleTimes(values, model, stageTitle, name, events);
}
);
}
function addIdleTimes(values, model, stageTitle, name, events) {
var cpuDuration = createNumericForIdleTime();
var insideIdle = createNumericForIdleTime();
var outsideIdle = createNumericForIdleTime();
var idleDeadlineOverrun = createNumericForIdleTime();
events.forEach(function(event) {
var idleTask = tr.metrics.v8.utils.findParent(
event, tr.metrics.v8.utils.isIdleTask);
var inside = 0;
var overrun = 0;
if (idleTask) {
var allottedTime = idleTask['args']['allotted_time_ms'];
if (event.duration > allottedTime) {
overrun = event.duration - allottedTime;
// Don't count time over the deadline as being inside idle time.
// Since the deadline should be relative to wall clock we
// compare allotted_time_ms with wall duration instead of thread
// duration, and then assume the thread duration was inside idle
// for the same percentage of time.
inside = event.cpuDuration * allottedTime / event.duration;
} else {
inside = event.cpuDuration;
}
}
cpuDuration.add(event.cpuDuration);
insideIdle.add(inside);
outsideIdle.add(event.cpuDuration - inside);
idleDeadlineOverrun.add(overrun);
});
values.addValue(new tr.v.NumericValue(
stageTitle + '-' + name + '_idle_deadline_overrun',
idleDeadlineOverrun));
values.addValue(new tr.v.NumericValue(
stageTitle + '-' + name + '_outside_idle', outsideIdle));
var percentage = createPercentage(insideIdle.sum,
cpuDuration.sum);
values.addValue(new tr.v.NumericValue(
stageTitle + '-' + name + '_percentage_idle', percentage));
}
function addV8ExecuteMutatorUtilization(values, model) {
groupAndProcessEvents(model,
tr.metrics.v8.utils.isTopV8ExecuteEvent,
event => 'v8-execute',
function(stageTitle, name, events) {
events.sort((a, b) => a.start - b.start);
var time = 0;
var pauses = [];
// Glue together the v8.execute events and adjust the GC pause
// times accordingly.
events.forEach(function(topEvent) {
topEvent.iterateAllDescendents(function(e) {
if (tr.metrics.v8.utils.isTopGarbageCollectionEvent(e)) {
pauses.push({ start: e.start - topEvent.start + time,
end: e.end - topEvent.start + time });
}
});
time += topEvent.duration;
});
// Now we have one big v8.execute interval from 0 to |time| and
// a list of GC pauses.
var mutatorUtilization = tr.metrics.v8.utils.mutatorUtilization(
0, time, WINDOW_SIZE_MS, pauses);
[0.90, 0.95, 0.99].forEach(function(percent) {
var value = new tr.v.ScalarNumeric(percentage_biggerIsBetter,
mutatorUtilization.percentile(1.0 - percent) * 100);
values.addValue(new tr.v.NumericValue(
stageTitle + '-v8-execute-mutator-utilization_pct_0' +
percent * 100,
value));
});
var value = new tr.v.ScalarNumeric(percentage_biggerIsBetter,
mutatorUtilization.min);
values.addValue(new tr.v.NumericValue(
stageTitle + '-v8-execute-mutator-utilization_min', value));
}
);
}
/**
* Filters events using the |filterCallback|, then groups events by the user
* expectation stage title and the name computed using the |nameCallback|,
* and then invokes the |processCallback| with the grouped events.
* @param {Function} filterCallback Takes an event and returns a boolean.
* @param {Function} nameCallback Takes event and returns a string.
* @param {Function} processCallback Takes a stage title, a name, and
* an array of events.
*/
function groupAndProcessEvents(model, filterCallback,
nameCallback, processCallback) {
// Two level map: stageTitle -> name -> [events].
var stageTitleToNameToEvents = {};
model.userModel.expectations.forEach(function(ue) {
stageTitleToNameToEvents[ue.stageTitle] =
stageTitleToNameToEvents[ue.stageTitle] || {};
var nameToEvents = stageTitleToNameToEvents[ue.stageTitle];
ue.associatedEvents.forEach(function(event) {
if (!filterCallback(event)) return;
var name = nameCallback(event);
nameToEvents[name] = nameToEvents[name] || [];
nameToEvents[name].push(event);
});
});
tr.b.iterItems(stageTitleToNameToEvents,
function(stageTitle, nameToEvents) {
tr.b.iterItems(nameToEvents, function(name, events) {
processCallback(stageTitle, name, events);
});
}
);
}
return {
gcMetric: gcMetric,
WINDOW_SIZE_MS: WINDOW_SIZE_MS // For testing purposes only.
};
});
</script>
|
