"use strict";
var session = ChromeUtils.import("resource://gre/modules/TelemetrySession.jsm", {});
const DUMMY_PAGE_DATA_URI = `data:text/html,
Dummy
`;
/**
* 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");
});
session.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];
ok(fewTabsSnapshot.sum > 0, "Zero difference between all the content processes is unlikely, what happened?");
ok(fewTabsSnapshot.sum < 80, "20 percentage difference on average is unlikely, what happened?");
let c = fewTabsSnapshot.counts;
for (let i = 10; i < c.length; i++) {
// If this check fails it means that one of the content processes uses at least 20% more or 20% less than the mean.
is(c[i], 0, "All the buckets above 10 should be empty");
}
}
histogram.clear();
BrowserTestUtils.removeTab(tab3);
BrowserTestUtils.removeTab(tab2);
BrowserTestUtils.removeTab(tab1);
finish();
});