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Test Info: Warnings
- This test gets skipped with pattern: os == 'android'
- Manifest: devtools/server/tests/chrome/chrome.toml
<!DOCTYPE HTML>
<html>
<!--
-->
<head>
<meta charset="utf-8">
<title>Memory monitoring actor test</title>
</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() {
allocs.push({});
}
// Using setTimeout results in wildly varying delays that make it hard to
// test our timestamps and results in intermittent failures. Instead, we
// actually spin an empty loop for a whole millisecond.
function actuallyWaitOneWholeMillisecond() {
const start = window.performance.now();
// eslint-disable-next-line curly
while (window.performance.now() - start < 1.000);
}
await memory.startRecordingAllocations();
allocator();
actuallyWaitOneWholeMillisecond();
allocator();
actuallyWaitOneWholeMillisecond();
allocator();
const response = await memory.getAllocations();
await memory.stopRecordingAllocations();
ok(response.allocationsTimestamps, "The response should have timestamps.");
is(response.allocationsTimestamps.length, response.allocations.length,
"There should be a timestamp for every allocation.");
const allocatorIndices = response.allocations
.map(function(a, idx) {
const frame = response.frames[a];
if (frame && frame.functionDisplayName === "allocator") {
return idx;
}
return null;
})
.filter(function(idx) {
return idx !== null;
});
is(allocatorIndices.length, 3,
"Should have our 3 allocations from the `allocator` timeouts.");
let lastTimestamp;
for (let i = 0; i < 3; i++) {
const timestamp = response.allocationsTimestamps[allocatorIndices[i]];
info("timestamp", timestamp);
ok(timestamp, "We should have a timestamp for the `allocator` allocation.");
if (lastTimestamp) {
const delta = timestamp - lastTimestamp;
info("delta since last timestamp", delta);
// ms
ok(delta >= 1,
"The timestamp should be about 1 ms after the last timestamp.");
}
lastTimestamp = timestamp;
}
await memory.detach();
destroyServerAndFinish(target);
})();
};
</script>
</pre>
</body>
</html>