TCP_NODELAY test

nodelay.js

"use strict";
const net = require("net");
const port = 4000;
var time, times = [];

function now() {
    let hrtime = process.hrtime();
    return hrtime[0] * 1e9 + hrtime[1];
}

net.createServer(function(socket) {
    let i = 0;
    socket.setNoDelay(true);
    time = now();
    while (++i <= 80) {
        socket.write(".");
    }
}).listen(port);

setInterval(function() {
    let socket = new net.Socket();
    socket.on("data", function (data) {
        console.log(data.toString());
        times.push(Math.round((now() - time) / 1000));
        socket.end();
    }).connect(port);
}, 100);

process.on("SIGINT", function () {
    console.log("\n" + times.length + " data events, average delay: " +
        Math.round(times.reduce(function (a, b) {
            return a + b;
        }) / times.length) + "µs");
    process.exit();
});