Shuhei Kagawa shuhei

Benchmark of Node.js Histogram Libraries

This benchmark compares the following libraries:

of:

Fixing wrong symbols in Node.js CPU Frame Graphs

Motivation

I have been generating CPU Flame Graphs of Node.js applications with Linux perf command, and noticed that some of the graphs have suspicious labels. For example, with a sandbox project and Node 10.8.0, I got LazyCompile:*a.renderDOM /opt/app/node_modules/react-dom/cjs/react-dom-server.node.production.min.js:35 where it should have been something related to streams.

For example, the following is a stack trace from perf script that I used to genearte a CPU Flame Graph. 227bbdff955b has a label LazyCompile:*a.renderDOM, but it doesn't make much sense that React.renderDOM was called from _stream_readable.js and parsed JSON in it.

node 22640 56531.256247:   10101010 cpu-clock:

gzsize

gzsize shows gzipped file sizes of files in your current working directory.

# For terminal
gzsize

# Markdown table
gzsize -m

UV_THREADPOOL=100 node index.js

ab -c 100 -n 1000

htop

	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;

	const http = require('http');

	const server = http.createServer((req, res) => {
	console.log('[server] request');
	setTimeout(() => {
	res.end('hello');
	console.log('[server] response');
	}, 3000);
	});
	server.listen(3000, () => {

	const a = {
	a: 1,
	b: null
	};
	const b = {
	a: 2,
	b: null
	};
	const c = {
	a: 2,

	function countChildren(el) {
	const children = el && el.children;
	if (!children) {
	return 0;
	}
	let count = 0;
	for (let i = 0; i < children.length; i++) {
	const child = children[i];
	count += 1;
	count += countChildren(child);

	const fs = require('fs');
	const path = require('path');

	class Node {
	constructor(start, end, depth) {
	this.start = start;
	this.end = end;
	this.middle = Math.floor((start + end) / 2);
	this.items = [];
	this.left = null;

	.PHONY: build

	configure:
	@node-gyp configure

	build:
	@node-gyp build

	run:
	@node index.js