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tests: Vendor blink perf tests (#38654)

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Vendors the [blink perf
tests](https://chromium.googlesource.com/chromium/src/+/HEAD/third_party/blink/perf_tests/).
These perf tests are useful to evaluate the performance of servo. 
The license that governs the perf tests is included in the folder. 
Running benchmark cases automatically is left to future work.

The update.py script is taken from mozjs and slightly adapted, so we can
easily filter
(and patch if this should be necessary in the future.

Testing: This PR just adds the perf_tests, but does not use or modify
them in any way.

---------

Signed-off-by: Jonathan Schwender <schwenderjonathan@gmail.com>
This commit is contained in:
Jonathan Schwender 2025-08-17 11:54:04 +02:00 • committed by GitHub
parent 7621332824
commit ee781b71b4
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1
tests/blink_perf_tests/perf_tests/loading/OWNERS Normal file
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file://third_party/blink/renderer/platform/loader/OWNERS

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tests/blink_perf_tests/perf_tests/loading/fetch-1000-cache.html Normal file
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<!DOCTYPE html>
<head>
<link rel="icon" href="data:,">
</head>
<body>
<script src="../resources/runner.js"></script>
<script>
let isDone = false;
PerfTestRunner.startMeasureValuesAsync({
description: "Measures the time to fetch 1,000 resources in batches of 100 from the disk cache.",
unit: "ms",
run: async function() {
while (!isDone) {
PerfTestRunner.addRunTestStartMarker();
let startTime = PerfTestRunner.now();
let fetches = [];
let count = 0;
// Send 10 batches of 100 fetches each to prevent resource errors.
// The net stack will error fetches if too many (~300) are in-flight at a time.
for (let runs = 0; runs < 10; runs++) {
for (i = 0; i < 100; i++) {
count++;
fetches.push(fetch("resources/blank.js?" + count));
}
await Promise.all(fetches)
}
PerfTestRunner.measureValueAsync(PerfTestRunner.now() - startTime);
PerfTestRunner.addRunTestEndMarker();
}
},
done: () => {isDone = true;},
iterationCount: 7,
warmUpCount: 2,
});
</script>

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tests/blink_perf_tests/perf_tests/loading/fetch-1000-nocache.html Normal file
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<!DOCTYPE html>
<head>
<link rel="icon" href="data:,">
</head>
<body>
<script src="../resources/runner.js"></script>
<script>
let isDone = false;
PerfTestRunner.startMeasureValuesAsync({
description: "Measures the time to fetch 1,000 resources in batches of 100, bypassing the cache.",
unit: "ms",
run: async function() {
while (!isDone) {
PerfTestRunner.addRunTestStartMarker();
let startTime = PerfTestRunner.now();
let fetches = [];
let count = 0;
// Send 10 batches of 100 fetches each to prevent resource errors.
// The net stack will error fetches if too many (~300) are in-flight at a time.
for (let runs = 0; runs < 10; runs++) {
for (i = 0; i < 100; i++) {
count++;
fetches.push(fetch("resources/blank.js?" + count, {cache: "no-store"}));
}
await Promise.all(fetches)
}
PerfTestRunner.measureValueAsync(PerfTestRunner.now() - startTime);
PerfTestRunner.addRunTestEndMarker();
}
},
done: () => {isDone = true;},
iterationCount: 7,
warmUpCount: 2,
});
</script>

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tests/blink_perf_tests/perf_tests/loading/resources/10k-scripts-nocache.html Normal file
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<!DOCTYPE html>
<html>
<head>
<script>
let run = 0;
const urlParams = new URLSearchParams(window.location.search);
const runParam = urlParams.get('run');
if (runParam) {
run = runParam;
}
const nonce = crypto.randomUUID();
let index = run * 100000;
let inject = "";
for (let i = 0; i < 10000; i++) {
index++;
inject += '<script src="blank.js?n=' + nonce + '&i=' + index + '"></sc' + 'ript>';
}
document.write(inject);
</script>
</head>
<body>
</body>
</html>

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tests/blink_perf_tests/perf_tests/loading/resources/10k-scripts.html Normal file
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tests/blink_perf_tests/perf_tests/loading/resources/blank.js Normal file
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/* */

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tests/blink_perf_tests/perf_tests/loading/resources/page_load_runner.js Normal file
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/*
Test loading of a page and waiting for the page to load.
PerfTestRunner.measurePageLoadTime doesn't wait for external resources
and is geared more towards parse/layout testing.
*/
function runPageLoadPerfTest(htmlFile, testDescription) {
let isDone = false;
let count = 0;
function runTest() {
PerfTestRunner.addRunTestStartMarker();
let startTime = PerfTestRunner.now();
count++;
let testFrame = document.createElement('iframe');
testFrame.src = htmlFile + "?run=" + count;
testFrame.width = "10";
testFrame.height = "10";
document.querySelector('body').appendChild(testFrame);
testFrame.onload = function() {
let runTime = PerfTestRunner.now() - startTime;
PerfTestRunner.measureValueAsync(runTime);
PerfTestRunner.addRunTestEndMarker();
if (!isDone) {
testFrame.remove();
var minRunTime = 100.0;
setTimeout(runTest, Math.max(0, minRunTime - runTime));
}
}
}
window.onload = function () {
PerfTestRunner.startMeasureValuesAsync({
unit: "ms",
done: function () {
isDone = true;
},
run: function () {
runTest();
},
iterationCount: 7,
warmUpCount: 2,
description: testDescription
});
};
}

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tests/blink_perf_tests/perf_tests/loading/scripts-10000-memcache.html Normal file
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<!DOCTYPE html>
<html>
<head>
<link rel="icon" href="data:,">
</head>
<body>
<script src="../resources/runner.js"></script>
<script src="resources/page_load_runner.js"></script>
<script>
runPageLoadPerfTest("resources/10k-scripts.html", "Measures performance of loading a page with 10,000 external scripts from the memory cache.");
</script>
</body>
</html>

13
tests/blink_perf_tests/perf_tests/loading/scripts-10000-nocache.html Normal file
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<!DOCTYPE html>
<html>
<head>
<link rel="icon" href="data:,">
</head>
<body>
<script src="../resources/runner.js"></script>
<script src="resources/page_load_runner.js"></script>
<script>
runPageLoadPerfTest("resources/10k-scripts-nocache.html", "Measures performance of loading a page with 10,000 external scripts, bypassing the cache.");
</script>
</body>
</html>