Alignment & Padding

• Golang defines the concept of byte alignment in the structure struct. Appropriate adjustment of the field order can save a lot of memory.
• Alignment speeds up memory access by generating code that requires one instruction each to read & write a memory location. without alignment, we may face a situation where the processor will have to use two or more instructions to access data located between addresses that are multiples of the size of the machine word.
• To align with machine word size, compiler adds padding in struct fields.

type	bytes
bool	1
byte	1
int	8
float32	4
float64	8
string	16
slice	24
map	8

• use aligncheck tool to optimize struct size. (https://gitlab.com/opennota/check).