test_memory_allocations_04.html

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Bug 1068171 - Test controlling the memory actor's allocation sampling probability.

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  <title>Memory monitoring actor test</title>

  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>

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<pre id="test">

<script src="memory-helpers.js" type="application/javascript"></script>

<script>

"use strict";

window.onload = function() {

  SimpleTest.waitForExplicitFinish();

  (async function() {

    const { memory, target } = await startServerAndGetSelectedTabMemory();

    await memory.attach();

    const allocs = [];

    function allocator() {

      for (let i = 0; i < 100; i++) {

        allocs.push({});

    const testProbability = async function(p) {

      info("probability = " + p);

      await memory.startRecordingAllocations({

        probability: p,

});

      allocator();

      const response = await memory.getAllocations();

      await memory.stopRecordingAllocations();

      return response.allocations.length;

};

    is((await testProbability(0.0)), 0,

       "With probability = 0.0, we shouldn't get any allocations.");

    ok((await testProbability(1.0)) >= 100,

       "With probability = 1.0, we should get all 100 allocations (plus "

       + "whatever allocations the actor and SpiderMonkey make).");

    // We don't test any other probabilities because the test would be

    // non-deterministic. We don't have a way to control the PRNG like we do in

    // jit-tests

    // (js/src/jit-test/tests/debug/Memory-allocationsSamplingProbability-*.js).

    await memory.detach();

    destroyServerAndFinish(target);

  })();

};

</script>

</pre>

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