node --expose-gc test.js

gistfile1.txt

var http = require('http')
 
function Wat() {
  this.get = function(cb) {

    function callback(response) {
      console.log("callback");
    }
    var req = http.request({
      host: "localhost",
      port: "5000",
      path: "/",
      headers: {'Content-Type': 'application/json'},
      method: 'GET',
      followAllRedirects: true
    }, function(res) {
      res.on('data', function (chunk) { });
    }).end();
  }
}
 
w = new Wat();
 
setInterval(function() {
 w.get(function Werd(res) { })
}, 500)

var mem = 0;
setInterval(function () {
  var mem2 = process.memoryUsage().rss;
  console.log(mem2,(mem2 - mem));
  mem = mem2;
}, 2000)

setInterval(function() {
  global.gc();
}, 10000)