heap.js

var fs = require('fs');

profiler.startProfiling('toto')

setTimeout(function() {
  var cpu = profiler.stopProfiling('toto');

  var snapshot = profiler.takeSnapshot('sisi');

  var buffer = '';

  snapshot.serialize(
    function iterator(data, length) {
      buffer += data;
    }, function complete() {
      var name = 'snap.heapsnapshot';
      fs.writeFile(name , buffer, function () {
        console.log('Heap snapshot written to ' + name);
      });
    }
  );

  fs.writeFileSync('heap.cpuprofile', JSON.stringify(cpu));
  console.log('worte');
}, 2000);