Sam Samjin

When you need to set value to "UV_THREADPOOL_SIZE"?

Libuv has a default thread pool size of 4, and uses a queue to manage access to the thread pool - the upshot is that if you have 5 long-running DB queries all going at the same time, one of them (and any other asynchronous action that relies on the thread pool) will be waiting for those queries to finish before they even get started.
Note, however, that tuning UV_THREADPOOL_SIZE may make more sense for a standalone application like a CLI written in Node.js. If you are standing up a bunch of Node.js processes using the cluster module then I would be surprised if tuning UV_THREADPOOL_SIZE was particularly beneficial for you. But if your application resembles the web tooling benchmarks then tuning UV_THREADPOOL_SIZE may help with performance.

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	"use strict";
	// https://expressjs.com/en/4x/api.html#res
	const express = require("express");
	const app = express();
	const port = process.env.port \|\| 3000;
	app.set("view engine", "pug");
	app.set("views", process.cwd() + "/views");

	app.get("/", (req, res) => {
	//handle route: get requests for "/"

	const dns = require('dns');
	const http = require('http');
	const https = require('https');
	const tls = require('tls');
	const net = require('net');
	const request = require('request');

	const httpAgent = new http.Agent();
	const httpsAgent = new https.Agent();

	const http = require("http");
	const net = require("net");

	const server = http.createServer((req, res) => {
	req.resume();
	res.end("hello");
	});

	server.keepAliveTimeout = 6 * 1000;
	server.headersTimeout = 4 * 1000;