node/test/pummel/test-net-connect-memleak.js

// Copyright Joyent, Inc. and other Node contributors.
//
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'use strict';
// Flags: --expose-gc

const common = require('../common');
const assert = require('assert');
const net = require('net');

assert.strictEqual(
  typeof global.gc,
  'function',
  'Run this test with --expose-gc'
);
net.createServer(function() {}).listen(common.PORT);

let before = 0;
{
  // 2**26 == 64M entries
  global.gc();
  let junk = [0];
  for (let i = 0; i < 26; ++i) junk = junk.concat(junk);
  before = process.memoryUsage().rss;

  net.createConnection(common.PORT, '127.0.0.1', function() {
    assert.notStrictEqual(junk.length, 0);  // keep reference alive
    setTimeout(done, 10);
    global.gc();
  });
}

function done() {
  global.gc();
  const after = process.memoryUsage().rss;
  const reclaimed = (before - after) / 1024;
  console.log('%d kB reclaimed', reclaimed);
  assert(reclaimed > 128 * 1024);  // It's around 256 MB on x64.
  process.exit();
}