Summary of the method of golang to prevent memory escape

In Go language, memory escape means that the variable allocated in the function is still referenced after the function ends, resulting in the lifetime of the variable being extended and being allocated on the heap rather than on the stack. Preventing memory escape helps improve program performance, because memory allocated on the stack can be recycled faster.

Here are some ways to prevent memory escaping:

Avoid returning pointers to local variables: Local variables created in functions, if returned with their pointers, may cause memory escape. Try to avoid using pointers of local variables as the return value of the function.

// Avoid returning pointers to local variablesfunc createLocalVariable() *int {
    var x int
    return &x  // Will cause x to escape to the heap}

Using a value receiver instead of a pointer receiver: In a type method, if the value receiver is not required to be modified, using a value receiver instead of a pointer receiver can avoid creating a pointer to the structure and reduce memory escape.

type MyStruct struct {
    data int
}

// Use value recipientfunc (s MyStruct) getValue() int {
    return 
}

// Avoid creating pointers to structuresfunc createStruct() MyStruct {
    return MyStruct{data: 42}
}

Avoid creating anonymous functions in loops: When using anonymous functions in loops, be careful that variables in function closures may cause memory escape. When creating a function in a loop, it is best to pass the loop variable as a parameter to the function instead of directly using it in the closure.

// Avoid creating anonymous functions in loops causing memory escapefunc avoidClosureInLoop() {
    var funcs []func()

    for i := 0; i < 10; i++ {
        // Avoid using loop variables i directly        x := i
        funcs = append(funcs, func() {
            (x)
        })
    }

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

Usage: In some scenarios, using can reduce memory escape, reuse objects through object pools, and reduce the overhead of frequently allocating and freeing memory.

import "sync"

var myPool = {
    New: func() interface{} {
        return make([]byte, 1024)
    },
}

func getFromPool() []byte {
    return ().([]byte)
}

func returnToPool(b []byte) {
    (b)
}

The above method is not applicable to all scenarios. The specific memory escape optimization strategy needs to be adjusted according to the specific code and scenario. You can use the go build -gcflags="-m" compilation parameter to check whether there is memory escape to help optimize.

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