Book Image

Mastering Node.js

By : Sandro Pasquali
Book Image

Mastering Node.js

By: Sandro Pasquali

Overview of this book

Node.js is a modern development stack focused on providing an easy way to build scalable network software. Backed by a growing number of large companies and a rapidly increasing developer base, Node is revolutionizing the way that software is being built today. Powered by Google's V8 engine and built out of C++ modules, this is a JavaScript environment for the enterprise.Mastering Node.js will take the reader deep into this exciting development environment. Beginning with a comprehensive breakdown of its innovative non-blocking evented design, Node's structure is explained in detail, laying out how its blazingly fast I/O performance simplifies the creation of fast servers, scalable architectures, and responsive web applications.Mastering Node.js takes you through a concise yet thorough tour of Node's innovative evented non-blocking design, showing you how to build professional applications with the help of detailed examples.Learn how to integrate your applications with Facebook and Twitter, Amazon and Google, creating social apps and programs reaching thousands of collaborators on the cloud. See how the Express and Path frameworks make the creation of professional web applications painless. Set up one, two, or an entire server cluster with just a few lines of code, ready to scale as soon as you're ready to launch. Move data seamlessly between databases and file systems, between clients, and across network protocols, using a beautifully designed, consistent, and predictable set of tools.Mastering Node.js contains all of the examples and explanations you'll need to build applications in a short amount of time and at a low cost, running on a scale and speed that would have been nearly impossible just a few years ago.
Table of Contents (20 chapters)
Mastering Node.js
About the Author
About the Reviewers

Broadcasting events

It is always good to have an accurate understanding of the total eventual cost of asking for a service to be performed.

I/O is expensive. In the following chart (taken from Ryan Dahl's original presentation on Node) we can see how many clock cycles typical system tasks consume. The relative cost of I/O operations is striking.

L1 cache

3 cycles

L2 cache

14 cycles


250 cycles


41,000,000 cycles


240,000,000 cycles

The reasons are clear enough: a disk is a physical device, a spinning metal platter that buses data at a speed that cannot possibly match the speed of an on-chip or near-chip cache moving data between the CPU and RAM (Random Access Memory). Similarly, a network is bound by the speed in which data can travel through its connecting "wires", modulated by its controllers. Even through fiber optic cables, light itself needs 0.1344 seconds to travel around the world. In a network used by billions of people regularly interacting across great distances...