Golang's 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()) }
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!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

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

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. �...

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

Efficiently handle concurrency security issues in multi-process log writing. Multiple processes write the same log file at the same time. How to ensure concurrency is safe and efficient? This is a...

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, ...

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

How to implement background running, stopping and reloading functions in Golang? During the programming process, we often need to implement background operation and stop...

Go pointer syntax and addressing problems in the use of viper library When programming in Go language, it is crucial to understand the syntax and usage of pointers, especially in...
