Monitoring all memory used by a webpage: performance.measureMemory ()

const object = { a: new Array(1000), b: new Array(2000) };
setInterval(() => console.log(object.a), 1000);

How is the new performance.measureMemory () API different from the old performance.memory?

Recommended Ways to Use the New API

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Current work progress

Using performance.measureMemory ()

▍ Enable Origin Trial Support

▍Registration in the Origin Trial program

1. Request a token for the opportunity you are interested in.
2. Add the token to the pages of the pilot project. There are 2 ways to do this:
   
   
   • Add a <meta>tag origin-trialto the title of each page. For example, it might look like this: <meta http-equiv="origin-trial" content="TOKEN_GOES_HERE">.
   • If you have access to the server settings, it can add a token using an HTTP header Origin-Trial. As a result, the response header should appear something like the following: Origin-Trial: TOKEN_GOES_HERE.

▍Enabling a new feature through Chrome flags

▍Checking API Use

if (performance.measureMemory) {
  let result;
  try {
    result = await performance.measureMemory();
  } catch (error) {
    if (error instanceof DOMException &&
        error.name === "SecurityError") {
      console.log("The context is not secure.");
    } else {
      throw error;
    }
  }
  console.log(result);
}

▍Local testing

Example

function scheduleMeasurement() {
  if (!performance.measureMemory) {
    console.log("performance.measureMemory() is not available.");
    return;
  }
  const interval = measurementInterval();
  console.log("Scheduling memory measurement in " +
      Math.round(interval / 1000) + " seconds.");
  setTimeout(performMeasurement, interval);
}

//       .
window.onload = function () {
  scheduleMeasurement();
}

function measurementInterval() {
  const MEAN_INTERVAL_IN_MS = 5 * 60 * 1000;
  return -Math.log(Math.random()) * MEAN_INTERVAL_IN_MS;
}

async function performMeasurement() {
  // 1.  performance.measureMemory().
  let result;
  try {
    result = await performance.measureMemory();
  } catch (error) {
    if (error instanceof DOMException &&
        error.name === "SecurityError") {
      console.log("The context is not secure.");
      return;
    }
    //    .
    throw error;
  }
  // 2.  .
  console.log("Memory usage:", result);
  // 3.   .
  scheduleMeasurement();
}

// ,    :
{
  bytes: 60_000_000,
  breakdown: [
    {
      bytes: 40_000_000,
      attribution: ["https://foo.com"],
      userAgentSpecificTypes: ["Window", "JS"]
    },
    {
      bytes: 20_000_000,
      attribution: ["https://foo.com/iframe"],
      userAgentSpecificTypes: ["Window", "JS"]
    }
  ]
}

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