Node js techtalksto

Chief Architect

james@joyent.com

James A. Duncan

Friday, March 4, 2011

Chief Architect @ Joyent

Spend a lot of my time thinking about how things should join together and why they shouldnʼt.

Grew up in Hawkesbury, Ontario

Live in the mountains to the north of Montreal in Quebec, Canada.

Formerly lived in London & was a CIO of a subsidiary of Canon Europe.

Open Source guy for 15 years.

Gardener, skier, and technologist.

James A. Duncan

Between 70-100 microprocessors

in a car!

1 flight, 1 plane, 480 TBs

Intel shipped 3.3 billion CPUs in Q1 2010

1.5ZBs of storage sold in 2010

Scale Up

From 1990 to 2010, “RAM” in computers increased 1,000,000x in the

same power footprint

Computer Scientistsand

Computer Engineers

the node.js project

To provide a purely evented, non-blocking infrastructure to script highly

concurrent programs.

TwistedPOEEventMachine

TwistedPOE = Pain.EventMachine

a snippet of code

...rows = db.select("col,umns FROM aTable WHERE aRow=‘foo’");do_something( rows );...

Computers can do nothing.Very fast.

L1: 3 cycles

L2: 14 Cycles

RAM: 250 cycles

Disk: 41,000,000 cycles

Network: 240,000,000 cycles

Anything that waits for a response from the disk, or the network can be considered “blocking” IO

a better snippet of code

...sql = "col,umns FROM aTable WHERE aRow=‘foo’";db.select(sql, do_something);...

Computer can keep doing things very fast.

Asynchronous IO.

Alternatives

Multiple ProcessesThreadsGreen Threads, Coroutines

Asynchronous IO.Not New.

Cultural Biasputs("Enter your name: ");var name = gets();puts("Name: " + name)

Infrastructural Bias

Callbacks

C will never go away.

Man Pages

Library support

Async File IO

• BSD:

• poll/select

• Linux:

• epoll

• FreeBSD

• kqueue

• Solaris

• /dev/poll

• libevent, libev

C will never go away.

C will never go away.Nor will JavaScript.

JavaScript is a cultural fit

the node.js project

• Evented server-side javascript

• All IO is non-blocking

• Good at handling lots of different IO at the same time

• Achieves this by making all IO non-blocking

• Primary author, and benevolent dictator for life is Ryan Dahl

• Owned by us (Joyent), but MIT/BSD licensed

• seems to be pretty popular, which is making us happy

• running our http://no.de service - lets you get started using node quickly

• running on HPʼs webOS as the underlying service mechanism (replaced Java)

a pleasing example

var http = require("http");var net = require("net");var c = 0;

http.createServer( function( req, res ) { c++; res.writeHead(200); res.end("Hello World");}).listen(8000);

net.createServer( function( socket ) { socket.write("connections: " + c); socket.end();}).listen(8001);

speed is obviously important

• Benchmark:

• nginx v0.7.65

• node v0.1.91

• tornado v0.2 (python 2.6.4)

• thin v1.2.7 (ruby 1.9.1-p376)

• Linux 2.53, using Intel Core 2 Duo & 4GB RAM

• Standard hello world, with a 100 byte response

establish the competition

Why is nginx so fast?

plot node.js results

what if we change the response size?

Implementation

buffer = new Buffer(16*1024);for (i = 0; i < buffer.length; i++) { buffer[i] = 100;}

http.createServer(function(req, res){ res.writeHead(200); res.end(buffer);});

JavaScript is only a little bit slower than lovingly hand-crafted optimized C.

JavaScript is only a little bit slower than lovingly hand-crafted optimized C. Wow.

How is this true?

ECMAScript

Speedy

Dogfood.

Libraries

var express = require('express');var app = express.createServer();

app.get("/", function(req, res, next) { res.send("Hello from the URL " + req.url);});

app.get(“/:name”, function(req, res, next) { res.send(“Hello “ + req.params.name);});app.listen(3000);

Web Framework - Express

Connect Middleware

Databases

Multi-process

Demo App

Conclusions& Thanks for Listening!

Node js techtalksto

Documents

Intro to Node JS

Node js quick tour v2

Caridy patino - node-js

Why i hate node js

Node js at paypal

Primeros Pasos de Node Js

Raspberry pi - Node js - Drupal

Node Js Websocket Js Meetup Slides

Windows Azure and node js

Node JS Docx

Node js felix

Node js - Javascript Server Side

Node js for beginners

Node js overview

Por que Node JS?

Node Js & 3D Printer

BIG DATA AND DATA ANALYTICS (Value Added Course) · Node JS (Value Added Course) Syllabus UNIT-I Introduction to Node JS –Introduction, What is Node JS, Advantages of Node JS, Traditional

Socket.IO Node.js Hello World Chat Application · — node index Igox vi index. js node index. js vi index. html node index 24 index. html 14 index. js . ø2 node modules ø2 package.json

Node JS Notes

Overview of Node JS