golang内存对齐的重要性

 

结构体中字段类型的改变直接造成内存对齐结果的改变，是的占用内存空间也不一样

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package main   import (     "fmt"     "unsafe" )   func main() {       var xx struct {         a bool         b int32         c []int     }       var x struct {         a int32         b []int         c bool     }     fmt.Println("SIZE")     fmt.Println(unsafe.Sizeof(x))  //40     fmt.Println(unsafe.Sizeof(xx)) //32     fmt.Println(unsafe.Sizeof(x.a))     fmt.Println(unsafe.Sizeof(x.b))     fmt.Println(unsafe.Sizeof(x.c))     fmt.Println("ALIGN")     fmt.Println(unsafe.Alignof(x))     fmt.Println(unsafe.Alignof(x.a))     fmt.Println(unsafe.Alignof(x.b))     fmt.Println(unsafe.Alignof(x.c))     fmt.Println("OFFSET")     fmt.Println(unsafe.Offsetof(x.a))     fmt.Println(unsafe.Offsetof(x.b))     fmt.Println(unsafe.Offsetof(x.c)) }

　　

可以参考文章：https://juejin.cn/post/7077833959047954463