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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
// @ts-check
var perfMetadata = {
owner: "Internationalization Team",
name: "Intl.DateTimeFormat",
description: "Test the speed of the Intl.DateTimeFormat implementation.",
options: {
default: {
perfherder: true,
perfherder_metrics: [
{
name: "Intl.DateTimeFormat constructor iterations",
unit: "iterations",
},
{ name: "Intl.DateTimeFormat constructor accumulatedTime", unit: "ms" },
{ name: "Intl.DateTimeFormat constructor perCallTime", unit: "ms" },
{
name: "Intl.DateTimeFormat.prototype.format iterations",
unit: "iterations",
},
{
name: "Intl.DateTimeFormat.prototype.format accumulatedTime",
unit: "ms",
},
{
name: "Intl.DateTimeFormat.prototype.format perCallTime",
unit: "ms",
},
],
verbose: true,
},
},
tags: ["intl", "ecma402"],
};
add_task(function measure_date() {
const measureConstructor = measureIterations(
"Intl.DateTimeFormat constructor"
);
const measureFormat = measureIterations(
"Intl.DateTimeFormat.prototype.format"
);
// Re-use the config between runs.
const fieldOptions = {
weekday: ["narrow", "short", "long"],
era: ["narrow", "short", "long"],
year: ["2-digit", "numeric"],
month: ["2-digit", "numeric", "narrow", "short", "long"],
day: ["2-digit", "numeric"],
hour: ["2-digit", "numeric"],
minute: ["2-digit", "numeric"],
second: ["2-digit", "numeric"],
timeZoneName: ["short", "long"],
};
const config = {};
function randomizeConfig(name, chance) {
const option = fieldOptions[name];
if (prng() < chance) {
config[name] = option[Math.floor(option.length * prng())];
} else {
delete config[name];
}
}
let date = new Date(Date.UTC(2020, 11, 20, 3, 23, 16, 738));
// Split each step of the benchmark into separate JS functions so that performance
// profiles are easy to analyze.
function benchmarkDateTimeFormatConstructor() {
for (let i = 0; i < 1000; i++) {
// Create a random configuration powered by a pseudo-random number generator. This
// way the configurations will be the same between 2 different runs.
const locale = pickRepresentativeLocale();
randomizeConfig("year", 0.5);
randomizeConfig("month", 0.5);
randomizeConfig("day", 0.5);
randomizeConfig("hour", 0.5);
randomizeConfig("minute", 0.5);
// Set the following to some lower probabilities:
randomizeConfig("second", 0.2);
randomizeConfig("timeZoneName", 0.2);
randomizeConfig("weekday", 0.2);
randomizeConfig("era", 0.1);
// Measure the constructor.
measureConstructor.start();
const formatter = Intl.DateTimeFormat(locale, config);
// Also include one format operation to ensure the constructor is de-lazified.
formatter.format(date);
measureConstructor.stop();
benchmarkFormatOperation(formatter);
}
}
const start = Date.UTC(2000);
const end = Date.UTC(2030);
const dateDiff = end - start;
function benchmarkFormatOperation(formatter) {
// Measure the format operation.
for (let j = 0; j < 100; j++) {
date = new Date(start + prng() * dateDiff);
measureFormat.start();
formatter.format(date);
measureFormat.stop();
}
}
benchmarkDateTimeFormatConstructor();
measureConstructor.reportMetrics();
measureFormat.reportMetrics();
ok(true);
});