acorn
Version:
ECMAScript parser
97 lines (85 loc) • 3.52 kB
HTML
<head>
<meta charset="utf-8">
<title>Acorn benchmark</title>
<script src="../acorn.js"></script>
<script src="compare/esprima.js"></script>
<script src="compare/traceur.js"></script>
<script src="jquery-string.js"></script>
<script src="codemirror-string.js"></script>
<style>
td { text-align: right; padding-right: 20px; }
th { text-align: left; padding-right: 40px; }
body { max-width: 50em; padding: 1em 2em; }
h1 { font-size: 150%; }
</style>
</head>
<h1>Acorn/Esprima/Traceur speed comparison</h1>
<p>This will run each of the three ES6 parsers on the source code of
jQuery 1.11.1 and CodeMirror 3.0b1 for five seconds, and show a table
indicating the number of lines parsed per second. Note that Traceur
always stores location data, and is thus not fairly compared by the
benchmark <em>without</em> location data.<p>
<p>Also note that having the developer tools open in Chrome, or
Firebug in Firefox <em>heavily</em> influences the numbers you get. In
Chrome, the effect even lingers (in the tab) after you close the
developer tools. Load in a fresh tab to get (halfway) stable
numbers.</p>
<button onclick="run(false)">Compare <strong>without</strong> location data</button>
<button onclick="run(true)">Compare <strong>with</strong> location data</button>
<button onclick="run(false, true)">Run only Acorn</button>
<span id="running"></span>
<script>
var sourceFileName = 'source.js';
function runAcorn(code, locations) {
acorn.parse(code, {ecmaVersion: 6, locations: locations, sourceFile: sourceFileName});
}
function runEsprima(code, locations) {
esprima.parse(code, {loc: locations, source: sourceFileName});
}
function runTraceur(code) {
var file = new traceur.syntax.SourceFile(sourceFileName, code);
var parser = new traceur.syntax.Parser(file);
parser.parseScript();
}
var totalLines = codemirror30.split("\n").length + jquery111.split("\n").length;
var nowHost = (typeof performance === 'object' && 'now' in performance) ? performance : Date;
function benchmark(runner, locations) {
// Give it a chance to warm up (first runs are usually outliers)
runner(jquery111, locations);
runner(codemirror30, locations);
var t0 = nowHost.now(), t1, lines = 0;
for (;;) {
runner(jquery111, locations);
runner(codemirror30, locations);
lines += totalLines;
t1 = nowHost.now();
if (t1 - t0 > 5000) break;
}
return lines / ((t1 - t0) / 1000);
}
function showOutput(values) {
var html = "<hr><table>";
for (var i = 0; i < values.length; ++i)
html += "<tr><th>" + values[i].name + "</td><td>" + Math.round(values[i].score) + " lines per second</td><td>" +
Math.round(values[i].score * 100 / values[0].score) + "%</td></tr>";
document.body.appendChild(document.createElement("div")).innerHTML = html;
}
function run(locations, acornOnly) {
var running = document.getElementById("running");
running.innerHTML = "Running benchmark...";
var data = [{name: "Acorn", runner: runAcorn},
{name: "Esprima", runner: runEsprima},
{name: "Traceur", runner: runTraceur}];
if (acornOnly) data.length = 1;
var pos = 0;
function next() {
data[pos].score = benchmark(data[pos].runner, locations);
if (++pos == data.length) {
running.innerHTML = "";
showOutput(data);
} else setTimeout(next, 100);
}
setTimeout(next, 50);
}
</script>