Weird memory behaviour

gistfile1.txt

var _ = require('lodash');

var candles = [];

var c = function() {
	console.log('create candle');
	_.each(_.range(100000), function(d) {
		var candle = {
			s: d,
			o: Math.random() * 1000,
			h: Math.random() * 1000,
			l: Math.random() * 1000,
			c: Math.random() * 1000,
			v: Math.random() * 1000,
			p: Math.random() * 1000
		};

		candles.push(candle);
	});
}

var d = function() {
	delete candles;
	console.log('delete candle');
}

var mem = function() {
	console.log('MEMORY:', process.memoryUsage().heapUsed / 1024 / 1024, 'MB');
}

mem();

setInterval(mem, 1000)

setTimeout(function() {
	c();
	setInterval(c, 1000);
}, 500);

setTimeout(function() {
	d();
	setInterval(d, 1000);
}, 1000);