Book Image

Mastering Go. - Second Edition

By : Mihalis Tsoukalos
Book Image

Mastering Go. - Second Edition

By: Mihalis Tsoukalos

Overview of this book

Often referred to (incorrectly) as Golang, Go is the high-performance systems language of the future. Mastering Go, Second Edition helps you become a productive expert Go programmer, building and improving on the groundbreaking first edition. Mastering Go, Second Edition shows how to put Go to work on real production systems. For programmers who already know the Go language basics, this book provides examples, patterns, and clear explanations to help you deeply understand Go’s capabilities and apply them in your programming work. The book covers the nuances of Go, with in-depth guides on types and structures, packages, concurrency, network programming, compiler design, optimization, and more. Each chapter ends with exercises and resources to fully embed your new knowledge. This second edition includes a completely new chapter on machine learning in Go, guiding you from the foundation statistics techniques through simple regression and clustering to classification, neural networks, and anomaly detection. Other chapters are expanded to cover using Go with Docker and Kubernetes, Git, WebAssembly, JSON, and more. If you take the Go programming language seriously, the second edition of this book is an essential guide on expert techniques.
Table of Contents (20 chapters)
Title Page

Benchmarking buffered writing

In this section, we will explore how the size of the write buffer affects the performance of the entire writing operation using the Go code of writingBU.go, which will be presented in five parts.

The writingBU.go program generates dummy files with randomly generated data. The variables of the program are the size of the buffer and the size of the output file.

The first part of writingBU.go is as follows:

package main 
 
import ( 
    "fmt" 
    "math/rand" 
    "os" 
    "strconv" 
) 
 
var BUFFERSIZE int 
var FILESIZE int 
 
func random(min, max int) int { 
    return rand.Intn(max-min) + min 
} 

The second code portion of writingBU.go contains the following Go code:

func createBuffer(buf *[]byte, count int) { 
    *buf = make([]byte, count) 
    if count == 0 { 
        return 
    } 
    for i := 0; i &lt...