Benchmarks for inline, outline, anonymous struct

inline_struct.go

package main

import (
	"encoding/json"
	"testing"
)

type PD2 struct {
	Property1 int     `json:"property1"`
	Property2 int     `json:"property2"`
	Property3 int     `json:"property3"`
	Property4 float64 `json:"property4"`
	Property5 float64 `json:"property5"`
	Property6 bool    `json:"property6"`
}

func Benchmark_Struct(b *testing.B) {

	data := []byte(`{"property1":1, "property2":1, "property3":3, "property4":"5", "property5":"0.4", "property6":true}`)

	b.Run("inline_struct", func(b *testing.B) {

		for n := 0; n < b.N; n++ {
			type PD2 struct {
				Property1 int     `json:"property1"`
				Property2 int     `json:"property2"`
				Property3 int     `json:"property3"`
				Property4 float64 `json:"property4"`
				Property5 float64 `json:"property5"`
				Property6 bool    `json:"property6"`
			}

			var pd2 *PD2
			_ = json.Unmarshal(data, &pd2)
		}
	})

	b.Run("outline_struct_inloop", func(b *testing.B) {
		for n := 0; n < b.N; n++ {
			var pd2 *PD2
			_ = json.Unmarshal(data, &pd2)
		}
	})

	b.Run("outline_struct_outloop", func(b *testing.B) {
		var pd2 *PD2
		for n := 0; n < b.N; n++ {
			_ = json.Unmarshal(data, &pd2)
		}
	})

	b.Run("inline_struct_anonymous_inloop", func(b *testing.B) {
		for n := 0; n < b.N; n++ {

			pd2 := struct {
				Property1 int     `json:"property1"`
				Property2 int     `json:"property2"`
				Property3 int     `json:"property3"`
				Property4 float64 `json:"property4"`
				Property5 float64 `json:"property5"`
				Property6 bool    `json:"property6"`
			}{}

			_ = json.Unmarshal(data, &pd2)

		}
	})

	b.Run("inline_struct_anonymous_outloop", func(b *testing.B) {
		pd2 := struct {
			Property1 int     `json:"property1"`
			Property2 int     `json:"property2"`
			Property3 int     `json:"property3"`
			Property4 float64 `json:"property4"`
			Property5 float64 `json:"property5"`
			Property6 bool    `json:"property6"`
		}{}

		for n := 0; n < b.N; n++ {
			_ = json.Unmarshal(data, &pd2)
		}
	})

}

output:

Running tool: /usr/local/go/bin/go test -benchmem -run=^$ -bench ^(Benchmark_Struct)$ console -v

goos: darwin
goarch: amd64
pkg: console
Benchmark_Struct
Benchmark_Struct/inline_struct
Benchmark_Struct/inline_struct-16         	  726765	      1673 ns/op	     416 B/op	       7 allocs/op
Benchmark_Struct/outline_struct_inloop
Benchmark_Struct/outline_struct_inloop-16 	  750530	      1649 ns/op	     416 B/op	       7 allocs/op
Benchmark_Struct/outline_struct_outloop
Benchmark_Struct/outline_struct_outloop-16         	  807182	      1638 ns/op	     360 B/op	       5 allocs/op
Benchmark_Struct/inline_struct_anoymous_inloop
Benchmark_Struct/inline_struct_anoymous_inloop-16  	  812196	      1550 ns/op	     408 B/op	       6 allocs/op
Benchmark_Struct/inline_struct_anoymous_outloop
Benchmark_Struct/inline_struct_anoymous_outloop-16 	  846127	      1602 ns/op	     360 B/op	       5 allocs/op
PASS
ok  	console	7.807s