Book Image

Mastering Node.js - Second Edition

By : Sandro Pasquali, Kevin Faaborg
Book Image

Mastering Node.js - Second Edition

By: Sandro Pasquali, Kevin Faaborg

Overview of this book

Node.js, a modern development environment that enables developers to write server- and client-side code with JavaScript, thus becoming a popular choice among developers. This book covers the features of Node that are especially helpful to developers creating highly concurrent real-time applications. It takes you on a tour of Node's innovative event non-blocking design, showing you how to build professional applications. This edition has been updated to cover the latest features of Node 9 and ES6. All code examples and demo applications have been completely rewritten using the latest techniques, introducing Promises, functional programming, async/await, and other cutting-edge patterns for writing JavaScript code. Learn how to use microservices to simplify the design and composition of distributed systems. From building serverless cloud functions to native C++ plugins, from chatbots to massively scalable SMS-driven applications, you'll be prepared for building the next generation of distributed software. By the end of this book, you'll be building better Node applications more quickly, with less code and more power, and know how to run them at scale in production environments.
Table of Contents (13 chapters)

Testing processes, memory, and CPU

There are native tools for Node, enabling you to profile running V8 processes. These are snapshots with summaries that capture statistics on how V8 treated the process when compiling, and the sorts of actions and decisions it made while it was selectively optimizing the hot code as it ran. This is a powerful debugging technique when trying to track down the reasons why, for example, a function is running slowly.

Any node process can have a a V8 log generated simply by passing the --prof (for profile) flag. Let's use an example to see how V8 process profiling works. Reading a large log file is a sufficiently non-trivial and common task that Node developers will come across. Let’s create a log reader and check its performance.

Profiling...