Book Image

Mastering Go - Third Edition

By : Mihalis Tsoukalos
5 (1)
Book Image

Mastering Go - Third Edition

5 (1)
By: Mihalis Tsoukalos

Overview of this book

Mastering Go is the essential guide to putting Go to work on real production systems. This freshly updated third edition includes topics like creating RESTful servers and clients, understanding Go generics, and developing gRPC servers and clients. Mastering Go was written for programmers who want to explore the capabilities of Go in practice. As you work your way through the chapters, you’ll gain confidence and a deep understanding of advanced Go concepts, including concurrency and the operation of the Go Garbage Collector, using Go with Docker, writing powerful command-line utilities, working with JavaScript Object Notation (JSON) data, and interacting with databases. You’ll also improve your understanding of Go internals to optimize Go code and use data types and data structures in new and unexpected ways. This essential Go programming book will also take you through the nuances and idioms of Go with exercises and resources to fully embed your newly acquired knowledge. With the help of Mastering Go, you’ll become an expert Go programmer by building Go systems and implementing advanced Go techniques in your projects.
Table of Contents (17 chapters)
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Profiling code

Profiling is a process of dynamic program analysis that measures various values related to program execution to give you a better understanding of the program behavior. In this section, we are going to learn how to profile Go code to understand it better and improve its performance. Sometimes, code profiling can even reveal bugs in the code such an endless loop or functions that never return.

The runtime/pprof standard Go package is used for profiling all kinds of applications apart from HTTP servers. The high-level net/http/pprof package should be used when you want to profile a web application written in Go. You can see the help page of the pprof tool by executing go tool pprof -help.

This next section is going to illustrate how to profile a command-line application, and the following subsection shows the profiling of an HTTP server.

Profiling a command-line application

The code of the application is saved as profileCla.go and collects CPU and memory...