https://github.com/nodejs/node/issues/21332

client2.js

const http2 = require('http2');
const fs = require('fs');
const connection = http2.connect('https://localhost:8080', {ca: fs.readFileSync('./keys/localhost-cert.pem')}); // http2session

function request(callback) {
  // http2stream
  const req = connection.request({
      ':method': 'GET',
      ':path': '/'
  });
  req.on('response', (headers, flags) => {});
  req.on('data', (chunk) => {});
  req.on('end', () => {
      // calling close or destroy on the stream makes no difference
      // but technically we shouldn't do that manually in this case anyway
      // req.close();
      // req.destroy();
      callback();
  });
  req.end();
}

function launch(total, parallel, gci, callback) {
  const done = () => {
    total--;
    if (total % 10000 === 0) console.log(total);
    if (gci > 0 && total % gci === 0) {
      //global.gc(true); global.gc(true); // Scavenge
      // OR
      global.gc(); global.gc(); // Mark-sweep
    }
    if (total >= parallel) request(done);
    else if (total === 0) callback();
  };
  for (let i = 0; i < parallel; i++) request(done);
}

// we will establish a baseline memory usage here
// connect the socket and wait for the first request to come back
request(() => {
  // grab current process memory usage
  global.gc(); global.gc(); // We are comparing gc-d memory
  var baselineMemory = process.memoryUsage();

  // total, parallel, gci
  // gci = 0 means don't run gc manually
  // gci = 100 means run gc manually every 100 requests
  launch(30000, 5, /*0*/100, () => {
    // GC what we can
    for (let i = 0; i < 20; i++) global.gc();

    var finalMemory = process.memoryUsage();
    var rssDelta = (finalMemory.rss - baselineMemory.rss) / 1024;
    var heapTotalDelta = (finalMemory.heapTotal - baselineMemory.heapTotal) / 1024;
    var heapUsedDelta = Math.round((finalMemory.heapUsed - baselineMemory.heapUsed) / 1024);

    console.log(`Deltas: ${heapTotalDelta} KB Heap Total, ${heapUsedDelta} KB Heap Used, ${rssDelta} KB RSS`);
    process.exit(0);
  });
});