Node Event Loop Lag

lag.js

// Also see https://github.com/tj/node-blocked/blob/master/index.js and https://stackoverflow.com/questions/28563354/how-to-detect-and-measure-event-loop-blocking-in-node-js

const blocked = require('blocked');

blocked(function(ms) {
	console.log("Blocked", ms);
}, { threshold: 10 });

var blockDelta = 1;
var interval = 500;
var interval = setInterval(function() {
	const last = process.hrtime();
	const last2 = Date.now();
	let x=  0;
	for (let i =0; i < 100000000; i++) { x++; }
	const calc_diff = (x) => {
		var diff = process.hrtime(last); // with process.hrtime()
		var delta = (diff[0] * 1e9 + diff[1]) * 1e-6;
		console.log("node.eventloop_blocked", Math.round(delta), Date.now() - last2, x);
		if (delta > blockDelta) {
			
		}
	}

	setImmediate(calc_diff, 'immediate');
	process.nextTick(calc_diff, 'nexttick');
}, interval);