Table of Contents
1. Introduction to GC in Golang
2. Golang’s GC principle analysis
3. Specific code example
Conclusion
Home Backend Development Golang Golang's gc introduction and principle analysis

Golang's gc introduction and principle analysis

Mar 06, 2024 pm 03:27 PM
golang go language Principle analysis

Golangs gc introduction and principle analysis

Title: Golang’s GC introduction and principle analysis

Golang (Go language), as an open source programming language developed by Google, has always been known for its efficient concurrency model and fast compilation speed have received widespread attention. Among them, Garbage Collection (GC) is a major feature of Golang. By automatically managing memory, it avoids many problems caused by developers' manual memory management. This article will briefly introduce Golang's garbage collection mechanism, while also deeply analyzing its principles and giving specific code examples.

1. Introduction to GC in Golang

The garbage collection mechanism in Golang adopts the mark-sweep algorithm, which is mainly divided into two stages: the marking stage and the clearing stage. In the marking phase, the system will mark all surviving objects; in the clearing phase, the system will clear all unmarked objects and release the memory space they occupy. The process is automated and the programmer does not need to do manual memory management.

2. Golang’s GC principle analysis

Golang’s GC mainly identifies and processes garbage objects in three ways:

  • Memory allocator: Golang’s memory The allocator divides memory into different size classes based on the size of the object and allocates memory to the object. This memory is released when the object is no longer used.
  • Root object: GC uses a series of root objects (such as global variables, variables in the stack, etc.) as a starting point to traverse the reference relationships between objects. Only objects reachable from the root object will be retained, and objects that have not been accessed will be cleared.
  • Concurrent marking: Golang's GC adopts concurrent marking during the marking phase, that is, while marking the object, the execution of the program continues, saving time.

3. Specific code example

The following is a simple code example to demonstrate Golang’s garbage collection process:

package main

import (
    "fmt"
    "runtime"
)

func main() {
    var a []int

    for i := 0; i < 1000000; i++ {
        a = append(a, i)
    }

    fmt.Println("Number of Goroutines before GC:", runtime.NumGoroutine())

    runtime.GC()

    fmt.Println("Number of Goroutines after GC:", runtime.NumGoroutine())
}
Copy after login

In this example, we create a Contain a slice of 1 million integers, and then call runtime.GC() to manually trigger garbage collection. By printing runtime.NumGoroutine() you can observe the change in the number of Goroutines before and after GC execution.

Conclusion

In general, Golang’s garbage collection mechanism effectively simplifies the complexity of memory management, allowing developers to focus more on writing business logic rather than the details of memory management. . Through the introduction and examples of this article, I hope readers will have a clearer understanding of Golang's GC and be able to better utilize the garbage collection mechanism to improve program performance and maintainability.

The above is an article about the introduction and principle analysis of Golang's GC. I hope readers can gain some new knowledge from it.

The above is the detailed content of Golang's gc introduction and principle analysis. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

What is the problem with Queue thread in Go's crawler Colly? What is the problem with Queue thread in Go's crawler Colly? Apr 02, 2025 pm 02:09 PM

Queue threading problem in Go crawler Colly explores the problem of using the Colly crawler library in Go language, developers often encounter problems with threads and request queues. �...

What libraries are used for floating point number operations in Go? What libraries are used for floating point number operations in Go? Apr 02, 2025 pm 02:06 PM

The library used for floating-point number operation in Go language introduces how to ensure the accuracy is...

How to solve the user_id type conversion problem when using Redis Stream to implement message queues in Go language? How to solve the user_id type conversion problem when using Redis Stream to implement message queues in Go language? Apr 02, 2025 pm 04:54 PM

The problem of using RedisStream to implement message queues in Go language is using Go language and Redis...

In Go, why does printing strings with Println and string() functions have different effects? In Go, why does printing strings with Println and string() functions have different effects? Apr 02, 2025 pm 02:03 PM

The difference between string printing in Go language: The difference in the effect of using Println and string() functions is in Go...

What should I do if the custom structure labels in GoLand are not displayed? What should I do if the custom structure labels in GoLand are not displayed? Apr 02, 2025 pm 05:09 PM

What should I do if the custom structure labels in GoLand are not displayed? When using GoLand for Go language development, many developers will encounter custom structure tags...

Which libraries in Go are developed by large companies or provided by well-known open source projects? Which libraries in Go are developed by large companies or provided by well-known open source projects? Apr 02, 2025 pm 04:12 PM

Which libraries in Go are developed by large companies or well-known open source projects? When programming in Go, developers often encounter some common needs, ...

Golang's Purpose: Building Efficient and Scalable Systems Golang's Purpose: Building Efficient and Scalable Systems Apr 09, 2025 pm 05:17 PM

Go language performs well in building efficient and scalable systems. Its advantages include: 1. High performance: compiled into machine code, fast running speed; 2. Concurrent programming: simplify multitasking through goroutines and channels; 3. Simplicity: concise syntax, reducing learning and maintenance costs; 4. Cross-platform: supports cross-platform compilation, easy deployment.

How to solve the problem of Golang generic function type constraints being automatically deleted in VSCode? How to solve the problem of Golang generic function type constraints being automatically deleted in VSCode? Apr 02, 2025 pm 02:15 PM

Automatic deletion of Golang generic function type constraints in VSCode Users may encounter a strange problem when writing Golang code using VSCode. when...

See all articles