How to use Golang library to improve file reading and writing performance?

The Go library provides two solutions to improve file reading and writing performance: the ioutil library is suitable for small files (usually less than 10MB) and provides fast reading and writing operations. The bufio library is suitable for large files (usually larger than 10MB) and uses buffered I/O to improve performance.

How to use Golang library to improve file reading and writing performance?

Efficient file reading and writing in Go is critical to improving application performance. This tutorial will introduce two popular Go libraries that can significantly improve the performance of file operations.

Introduction ioutil Library

ioutil is a built-in Go library that provides many useful file operation functions. For small files (usually less than 10MB), the ioutil library is great for fast read and write operations.

Code example:

package main

import (
    "fmt"
    "io/ioutil"
)

func main() {
    // 读取文件内容
    content, err := ioutil.ReadFile("myfile.txt")
    if err != nil {
        fmt.Println(err)
        return
    }
    fmt.Println(string(content))

    // 写入文件内容
    err = ioutil.WriteFile("myfile.txt", []byte("Hello world!"), 0644)
    if err != nil {
        fmt.Println(err)
        return
    }
}

Introducing the bufio library

For larger files (usually larger than 10MB), bufio The library provides more efficient buffered I/O operations. It improves performance by using buffers to reduce the number of system calls.

Code Example:

package main

import (
    "bufio"
    "fmt"
    "os"
)

func main() {
    // 读取文件内容
    file, err := os.Open("myfile.txt")
    if err != nil {
        fmt.Println(err)
        return
    }
    defer file.Close()

    scanner := bufio.NewScanner(file)
    for scanner.Scan() {
        fmt.Println(scanner.Text())
    }

    // 写入文件内容
    file, err = os.Create("myfile.txt")
    if err != nil {
        fmt.Println(err)
        return
    }
    defer file.Close()

    writer := bufio.NewWriter(file)
    fmt.Fprint(writer, "Hello world!")
    writer.Flush()
}

Performance Benchmark

The following benchmark results demonstrate the use of ioutil and bufio Impact of the library on file reading performance:

##1MB1.2ms0.8ms10MB12.5ms3.5ms##100MBAs the benchmarks show, for larger files, the

File size	ioutil	bufio
125.6ms	10.2ms

bufio

library performs significantly better than the ioutil library.

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