devtools/server/tests/chrome/test_memory_allocations_02.html

   1 <!DOCTYPE HTML>
   2 <html>
   3 <!--
   4 Bug 1132764 - Test controlling the maximum allocations log length over the RDP.
   5 -->
   6 <head>
   7   <meta charset="utf-8">
   8   <title>Memory monitoring actor test</title>
   9   <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
  10   <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">
  11 </head>
  12 <body>
  13 <pre id="test">
  14 <script src="memory-helpers.js" type="application/javascript"></script>
  15 <script>
  16 "use strict";
  17
  18 window.onload = function() {
  19   SimpleTest.waitForExplicitFinish();
  20
  21   (async function() {
  22     const { memory, target } = await startServerAndGetSelectedTabMemory();
  23     await memory.attach();
  24
  25     const allocs = [];
  26     let eventsFired = 0;
  27     let intervalId = null;
  28     function onAlloc() {
  29       eventsFired++;
  30     }
  31     function startAllocating() {
  32       intervalId = setInterval(() => {
  33         for (let i = 100000; --i;) {
  34           allocs.push({});
  35         }
  36       }, 1);
  37     }
  38     function stopAllocating() {
  39       clearInterval(intervalId);
  40     }
  41
  42     memory.on("allocations", onAlloc);
  43
  44     await memory.startRecordingAllocations({
  45       drainAllocationsTimeout: 10,
  46     });
  47
  48     await waitUntil(() => eventsFired > 5);
  49     ok(eventsFired > 5,
  50        "Some allocation events fired without allocating much via auto drain");
  51     await memory.stopRecordingAllocations();
  52
  53     // Set a really high auto drain timer so we can test if
  54     // it fires on GC
  55     eventsFired = 0;
  56     const startTime = performance.now();
  57     const drainTimer = 1000000;
  58     await memory.startRecordingAllocations({
  59       drainAllocationsTimeout: drainTimer,
  60     });
  61
  62     startAllocating();
  63     await waitUntil(() => {
  64       Cu.forceGC();
  65       return eventsFired > 1;
  66     });
  67     stopAllocating();
  68     ok(performance.now() - drainTimer < startTime,
  69        "Allocation events fired on GC before timer");
  70     await memory.stopRecordingAllocations();
  71
  72     memory.off("allocations", onAlloc);
  73     await memory.detach();
  74     destroyServerAndFinish(target);
  75   })();
  76 };
  77 </script>
  78 </pre>
  79 </body>
  80 </html>