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<!DOCTYPE HTML>
<html>
<!--
Bug 1068171 - Test controlling the memory actor's allocation sampling probability.
-->
<head>
<meta charset="utf-8">
<title>Memory monitoring actor test</title>
<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">
</head>
<body>
<pre id="test">
<script src="memory-helpers.js" type="application/javascript"></script>
<script>
"use strict";
window.onload = function() {
SimpleTest.waitForExplicitFinish();
(async function() {
const { memory, target } = await startServerAndGetSelectedTabMemory();
await memory.attach();
const allocs = [];
function allocator() {
for (let i = 0; i < 100; i++) {
allocs.push({});
}
}
const testProbability = async function(p, expected) {
info("probability = " + p);
await memory.startRecordingAllocations({
probability: p,
});
allocator();
const response = await memory.getAllocations();
await memory.stopRecordingAllocations();
return response.allocations.length;
};
is((await testProbability(0.0)), 0,
"With probability = 0.0, we shouldn't get any allocations.");
ok((await testProbability(1.0)) >= 100,
"With probability = 1.0, we should get all 100 allocations (plus "
+ "whatever allocations the actor and SpiderMonkey make).");
// We don't test any other probabilities because the test would be
// non-deterministic. We don't have a way to control the PRNG like we do in
// jit-tests
// (js/src/jit-test/tests/debug/Memory-allocationsSamplingProbability-*.js).
await memory.detach();
destroyServerAndFinish(target);
})();
};
</script>
</pre>
</body>
</html>
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