Golang初学者对函数返回值还是指针的测试

先把简单的代码贴出来,然后再废话。

先是benchmark的命令

go test -bench=Poin -memprofile=pointermem.pprof -memprofilerate=1 -benchmem

go test -bench=Value -memprofile=valuemem.pprof -memprofilerate=1 -benchmem

然后是pprof的结果,先是pointer的,再是value的,可以看到pointer的报告2allocs/op

package main
type mytype struct {
	field1 string
	field2 string
	field3 string
	field4 string
	field5 string
	field6 string
	field7 string
	field8 string
	field9 string
}
func returnValue() mytype {
	return mytype{
		field1: "abc",
		field2: "aaa",
		field3: "vvv",
		field4: "ddd",
		field5: "394834",
		field6: "sdfbd34534",
		field7: "asdf34534d90sdfsd",
		field8: "asdf3424jjiiihiu",
		field9: "vmxvbxcvb8rewasdfasdf",
	}
}
func returnPointer() *mytype {
	return &mytype{
		field1: "abc",
		field2: "aaa",
		field3: "vvv",
		field4: "ddd",
		field5: "394834",
		field6: "sdfbd34534",
		field7: "asdf34534d90sdfsd",
		field8: "asdf3424jjiiihiu",
		field9: "vmxvbxcvb8rewasdfasdf",
	}
}
func main() {
}

package main
import (
	"fmt"
	"testing"
)
func BenchmarkReturnValue(b *testing.B) {
	var x mytype
	for i := 0; i < b.N; i++ {
		x = returnValue()
		fmt.Println(x)
	}
}
func BenchmarkReturnPointer(b *testing.B) {
	var x *mytype
	for i := 0; i < b.N; i++ {
		x = returnPointer()
		fmt.Println(*x)
	}
}

本文来自:开源中国博客

感谢作者:Kyli

查看原文:Golang初学者对函数返回值还是指针的测试