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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
// Performance monitoring and calculation.
function round_up(val, interval) {
return val + (interval - (val % interval));
}
// Class for inter-frame timing, which handles being paused and resumed.
var FrameTimer = class {
constructor() {
// Start time of the current active test, adjusted for any time spent
// stopped (so `now - this.start` is how long the current active test
// has run for.)
this.start = undefined;
// Timestamp of callback following the previous frame.
this.prev = undefined;
// Timestamp when drawing was paused, or zero if drawing is active.
this.stopped = 0;
}
is_stopped() {
return this.stopped != 0;
}
start_recording(now = gHost.now()) {
this.start = this.prev = now;
}
on_frame_finished(now = gHost.now()) {
const delay = now - this.prev;
this.prev = now;
return delay;
}
pause(now = gHost.now()) {
this.stopped = now;
// Abuse this.prev to store the time elapsed since the previous frame.
// This will be used to adjust this.prev when we resume.
this.prev = now - this.prev;
}
resume(now = gHost.now()) {
this.prev = now - this.prev;
const stop_duration = now - this.stopped;
this.start += stop_duration;
this.stopped = 0;
}
};
// Per-frame time sampling infra.
var sampleTime = 16.666667; // ms
var sampleIndex = 0;
// Class for maintaining a rolling window of per-frame GC-related counters:
// inter-frame delay, minor/major/slice GC counts, cumulative bytes, etc.
var FrameHistory = class {
constructor(numSamples) {
// Private
this._frameTimer = new FrameTimer();
this._numSamples = numSamples;
// Public API
this.delays = new Array(numSamples);
this.gcBytes = new Array(numSamples);
this.mallocBytes = new Array(numSamples);
this.gcs = new Array(numSamples);
this.minorGCs = new Array(numSamples);
this.majorGCs = new Array(numSamples);
this.slices = new Array(numSamples);
sampleIndex = 0;
this.reset();
}
start(now = gHost.now()) {
this._frameTimer.start_recording(now);
}
reset() {
this.delays.fill(0);
this.gcBytes.fill(0);
this.mallocBytes.fill(0);
this.gcs.fill(this.gcs[sampleIndex]);
this.minorGCs.fill(this.minorGCs[sampleIndex]);
this.majorGCs.fill(this.majorGCs[sampleIndex]);
this.slices.fill(this.slices[sampleIndex]);
sampleIndex = 0;
}
get numSamples() {
return this._numSamples;
}
findMax(collection) {
// Depends on having at least one non-negative entry, and unfilled
// entries being <= max.
var maxIndex = 0;
for (let i = 0; i < this._numSamples; i++) {
if (collection[i] >= collection[maxIndex]) {
maxIndex = i;
}
}
return maxIndex;
}
findMaxDelay() {
return this.findMax(this.delays);
}
on_frame(now = gHost.now()) {
const delay = this._frameTimer.on_frame_finished(now);
// Total time elapsed while the active test has been running.
var t = now - this._frameTimer.start;
var newIndex = Math.round(t / sampleTime);
while (sampleIndex < newIndex) {
sampleIndex++;
var idx = sampleIndex % this._numSamples;
this.delays[idx] = delay;
if (gHost.features.haveMemorySizes) {
this.gcBytes[idx] = gHost.gcBytes;
this.mallocBytes[idx] = gHost.mallocBytes;
}
if (gHost.features.haveGCCounts) {
this.minorGCs[idx] = gHost.minorGCCount;
this.majorGCs[idx] = gHost.majorGCCount;
this.slices[idx] = gHost.GCSliceCount;
}
}
return delay;
}
pause() {
this._frameTimer.pause();
}
resume() {
this._frameTimer.resume();
}
is_stopped() {
return this._frameTimer.is_stopped();
}
};
var PerfTracker = class {
constructor() {
// Private
this._currentLoadStart = undefined;
this._frameCount = undefined;
this._mutating_ms = undefined;
this._suspend_sec = undefined;
this._minorGCs = undefined;
this._majorGCs = undefined;
// Public
this.results = [];
}
on_load_start(load, now = gHost.now()) {
this._currentLoadStart = now;
this._frameCount = 0;
this._mutating_ms = 0;
this._suspend_sec = 0;
this._majorGCs = gHost.majorGCCount;
this._minorGCs = gHost.minorGCCount;
}
on_load_end(load, now = gHost.now()) {
const elapsed_time = (now - this._currentLoadStart) / 1000;
const full_time = round_up(elapsed_time, 1 / 60);
const frame_60fps_limit = Math.round(full_time * 60);
const dropped_60fps_frames = frame_60fps_limit - this._frameCount;
const dropped_60fps_fraction = dropped_60fps_frames / frame_60fps_limit;
const mutating_and_gc_fraction = this._mutating_ms / (full_time * 1000);
const result = {
load,
elapsed_time,
mutating: this._mutating_ms / 1000,
mutating_and_gc_fraction,
suspended: this._suspend_sec,
full_time,
frames: this._frameCount,
dropped_60fps_frames,
dropped_60fps_fraction,
majorGCs: gHost.majorGCCount - this._majorGCs,
minorGCs: gHost.minorGCCount - this._minorGCs,
};
this.results.push(result);
this._currentLoadStart = undefined;
this._frameCount = 0;
return result;
}
after_suspend(wait_sec) {
this._suspend_sec += wait_sec;
}
before_mutator(now = gHost.now()) {
this._frameCount++;
}
after_mutator(start_time, end_time = gHost.now()) {
this._mutating_ms += end_time - start_time;
}
};
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