const DUMMY_PAGE_DATA_URI = `data:text/html,
<html>
<head>
<meta charset="utf-8"/>
<title>Dummy</title>
</head>
<body>
<h1 id='header'>Just a regular everyday normal page.</h1>
</body>
</html>`;
/** * Tests the MEMORY_DISTRIBUTION_AMONG_CONTENT probe by opening a few tabs, then triggering * the memory probes and waiting for the "gather-memory-telemetry-finished" notification.
*/
add_task(async function test_memory_distribution() {
waitForExplicitFinish();
if (SpecialPowers.getIntPref("dom.ipc.processCount", 1) < 2) {
ok(true, "Skip this test if e10s-multi is disabled.");
finish(); return;
}
Services.telemetry.canRecordExtended = true;
let histogram = Services.telemetry.getKeyedHistogramById( "MEMORY_DISTRIBUTION_AMONG_CONTENT"
);
histogram.clear();
let tab1 = await BrowserTestUtils.openNewForegroundTab(
gBrowser,
DUMMY_PAGE_DATA_URI
);
let tab2 = await BrowserTestUtils.openNewForegroundTab(
gBrowser,
DUMMY_PAGE_DATA_URI
);
let tab3 = await BrowserTestUtils.openNewForegroundTab(
gBrowser,
DUMMY_PAGE_DATA_URI
);
let finishedGathering = new Promise(resolve => {
let obs = function () {
Services.obs.removeObserver(obs, "gather-memory-telemetry-finished");
resolve();
};
Services.obs.addObserver(obs, "gather-memory-telemetry-finished");
});
TelemetrySession.getPayload();
await finishedGathering;
let s = histogram.snapshot();
ok("0 - 10 tabs" in s, "We should have some samples by now in this bucket."); for (var key in s) {
is(key, "0 - 10 tabs");
let fewTabsSnapshot = s[key]; Assert.greater(
fewTabsSnapshot.sum,
0, "Zero difference between all the content processes is unlikely, what happened?"
); Assert.less(
fewTabsSnapshot.sum,
80, "20 percentage difference on average is unlikely, what happened?"
);
let values = fewTabsSnapshot.values; for (let [bucket, value] of Object.entries(values)) { if (bucket >= 10) { // If this check fails it means that one of the content processes uses at least 20% more or 20% less than the mean.
is(value, 0, "All the buckets above 10 should be empty");
}
}
}
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