Efficient use of Go's garbage collector

Efficient use of the garbage collector in Go language requires specific code examples

In Go language, the garbage collector (Garbage Collector, GC) automatically manages memory allocation and release key components. It scans the objects in memory to determine which objects can be safely released, and then recycles them for reuse.

However, the garbage collector can also cause performance problems, especially when there are a large number of objects and frequent memory allocations in the program. Therefore, in order to improve the performance of the program, we need to use the Go language garbage collector efficiently.

Below, I will introduce some techniques for using the garbage collector in the Go language and give some specific code examples.

1. Avoid frequent memory allocation

In the Go language, frequent memory allocation may cause the garbage collector to perform frequent garbage collection, thereby affecting the performance of the program. Therefore, we should try to avoid frequent memory allocation.

For example, if you need to create many temporary string objects, consider using the strings.Builder type to avoid frequent memory allocation. Here is a sample code:

package main

import (
    "fmt"
    "strings"
)

func main() {
    var builder strings.Builder

    for i := 0; i < 10000; i++ {
        builder.WriteString("hello")
    }

    result := builder.String()
    fmt.Println(result)
}

2. Using sync.Pool to reuse objects

sync.Pool## in Go language #Types can be used to reuse objects, thereby reducing the overhead of memory allocation.

sync.Pool:

package main

import (
    "fmt"
    "sync"
)

type MyObject struct {
    value int
}

var myObjectPool = sync.Pool{
    New: func() interface{} {
        return &MyObject{}
    },
}

func main() {
    obj := myObjectPool.Get().(*MyObject)
    obj.value = 123

    // 使用对象...

    myObjectPool.Put(obj)

    // 继续使用对象...
}

Avoid creating anonymous functions in loops

package main

import "fmt"

func main() {
    var funcs []func()

    for i := 0; i < 10000; i++ {
        funcs = append(funcs, func() {
            fmt.Println(i)
        })
    }

    for _, f := range funcs {
        f()
    }
}

package main

import "fmt"

func main() {
    var funcs []func()

    for i := 0; i < 10000; i++ {
        i := i // 通过复制i的值来避免对外部变量的引用
        funcs = append(funcs, func() {
            fmt.Println(i)
        })
    }

    for _, f := range funcs {
        f()
    }
}

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