devtools/server/tests/chrome/test_memory_gc_01.html

   1 <!DOCTYPE HTML>
   2 <html>
   3 <!--
   4 Bug 1067491 - Test forcing a gc.
   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
  24     let beforeGC, afterGC;
  25
  26     do {
  27       let objects = [];
  28       for (let i = 0; i < 1000; i++) {
  29         const o = {};
  30         o[Math.random()] = 1;
  31         objects.push(o);
  32       }
  33       objects = null;
  34
  35       beforeGC = (await memory.measure()).total;
  36
  37       await memory.forceGarbageCollection();
  38
  39       afterGC = (await memory.measure()).total;
  40     } while (beforeGC < afterGC);
  41
  42     ok(true, "The amount of memory after GC should eventually decrease");
  43
  44     destroyServerAndFinish(target);
  45   })();
  46 };
  47 </script>
  48 </pre>
  49 </body>
  50 </html>