gistfile1.js

#!/usr/bin/env node --harmony
var map = new WeakMap();
var heapStat = {
	current: undefined,
	max: -Infinity
};
(function iterate(){
	console.log(
		'Current: %s\tMax: %s',
		heapStat.current = process.memoryUsage().heapUsed,
		heapStat.max = Math.max(heapStat.current, heapStat.max)
	); // Show Stats

	map.set(
		{}, // New object as key
		{foo: Array(65535).join(0)} // New bulk object as value
	);
	setTimeout(iterate, 0); // More GC-friendly than process.nextTick
})();