tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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browser_memory_distribution_telemetry.js (2563B)

      1 "use strict";
      2 
      3 const { TelemetrySession } = ChromeUtils.importESModule(
      4  "resource://gre/modules/TelemetrySession.sys.mjs"
      5 );
      6 
      7 const DUMMY_PAGE_DATA_URI = `data:text/html,
      8    <html>
      9      <head>
     10        <meta charset="utf-8"/>
     11        <title>Dummy</title>
     12      </head>
     13      <body>
     14        <h1 id='header'>Just a regular everyday normal page.</h1>
     15      </body>
     16    </html>`;
     17 
     18 /**
     19 * Tests the MEMORY_DISTRIBUTION_AMONG_CONTENT probe by opening a few tabs, then triggering
     20 * the memory probes and waiting for the "gather-memory-telemetry-finished" notification.
     21 */
     22 add_task(async function test_memory_distribution() {
     23  waitForExplicitFinish();
     24 
     25  if (SpecialPowers.getIntPref("dom.ipc.processCount", 1) < 2) {
     26    ok(true, "Skip this test if e10s-multi is disabled.");
     27    finish();
     28    return;
     29  }
     30 
     31  Services.telemetry.canRecordExtended = true;
     32 
     33  let histogram = Services.telemetry.getKeyedHistogramById(
     34    "MEMORY_DISTRIBUTION_AMONG_CONTENT"
     35  );
     36  histogram.clear();
     37 
     38  let tab1 = await BrowserTestUtils.openNewForegroundTab(
     39    gBrowser,
     40    DUMMY_PAGE_DATA_URI
     41  );
     42  let tab2 = await BrowserTestUtils.openNewForegroundTab(
     43    gBrowser,
     44    DUMMY_PAGE_DATA_URI
     45  );
     46  let tab3 = await BrowserTestUtils.openNewForegroundTab(
     47    gBrowser,
     48    DUMMY_PAGE_DATA_URI
     49  );
     50 
     51  let finishedGathering = new Promise(resolve => {
     52    let obs = function () {
     53      Services.obs.removeObserver(obs, "gather-memory-telemetry-finished");
     54      resolve();
     55    };
     56    Services.obs.addObserver(obs, "gather-memory-telemetry-finished");
     57  });
     58 
     59  TelemetrySession.getPayload();
     60 
     61  await finishedGathering;
     62 
     63  let s = histogram.snapshot();
     64  ok("0 - 10 tabs" in s, "We should have some samples by now in this bucket.");
     65  for (var key in s) {
     66    is(key, "0 - 10 tabs");
     67    let fewTabsSnapshot = s[key];
     68    Assert.greater(
     69      fewTabsSnapshot.sum,
     70      0,
     71      "Zero difference between all the content processes is unlikely, what happened?"
     72    );
     73    Assert.less(
     74      fewTabsSnapshot.sum,
     75      80,
     76      "20 percentage difference on average is unlikely, what happened?"
     77    );
     78    let values = fewTabsSnapshot.values;
     79    for (let [bucket, value] of Object.entries(values)) {
     80      if (bucket >= 10) {
     81        // If this check fails it means that one of the content processes uses at least 20% more or 20% less than the mean.
     82        is(value, 0, "All the buckets above 10 should be empty");
     83      }
     84    }
     85  }
     86 
     87  histogram.clear();
     88 
     89  BrowserTestUtils.removeTab(tab3);
     90  BrowserTestUtils.removeTab(tab2);
     91  BrowserTestUtils.removeTab(tab1);
     92  finish();
     93 });