DoD vs Std Struct

player_test.go

package main

import (
	"math/rand"
	"testing"
)

type Player struct {
	ID        int
	health    int
	mana      int
	maxHealth int
	minHealth int
	maxMana   int
	minMana   int
	junkData1 int
	junkData2 int
	junkData3 int
	junkData4 int
	junkData5 int
	junkData6 int
	junkData7 int
	junkData8 int
	junkData9 int
}

type DoDPlayer struct {
	IDs        []int
	healths    []int
	manas      []int
	maxHealths []int
	minHealths []int
	maxManas   []int
	minManas   []int
	junkDatas1 []int
	junkDatas2 []int
	junkDatas3 []int
	junkDatas4 []int
	junkDatas5 []int
	junkDatas6 []int
	junkDatas7 []int
	junkDatas8 []int
	junkDatas9 []int
}


func BenchmarkPlayerStd(b *testing.B) {
	players := generatePlayers()
	for n := 0; n < b.N; n++ {
		for i := 0; i < len(players); i++ {
			players[i].mana = players[i].mana + 1
		}
	}
}

func BenchmarkPlayerDoD(b *testing.B) {
	dodplayer := generateDoDPlayers()
	manas := dodplayer.manas
	for n := 0; n < b.N; n++ {
		for i := 0; i < len(manas); i++ {
			manas[i] = manas[i] + 1
		}
	}
}

func BenchmarkSearchPlayerStd(b *testing.B) {
	players := generatePlayers()
	for n := 0; n < b.N; n++ {
		for _, p := range players {
			if p.ID == 5000 {
				break
			}
		}
	}
}

func BenchmarkSeachPlayerDoD(b *testing.B) {
	player := generateDoDPlayers()
	for n := 0; n < b.N; n++ {
		for _, p := range player.IDs {
			if p == 5000 {
				break
			}
		}
	}
}

func generatePlayers() []Player {
	rnd := rand.New(rand.NewSource(64))
	size := 10000
	players := make([]Player, size)
	for i := 0; i < size; i++ {
		players = append(players, Player{ID: i, mana: rnd.Intn(1000)})
	}

	return players
}

func generateDoDPlayers() DoDPlayer {
	rnd := rand.New(rand.NewSource(64))
	size := 10000
	player := DoDPlayer{
		IDs:        make([]int, size),
		healths:    make([]int, size),
		manas:      make([]int, size),
		maxHealths: make([]int, size),
		minHealths: make([]int, size),
		maxManas:   make([]int, size),
		minManas:   make([]int, size),
		junkDatas1: make([]int, size),
		junkDatas2: make([]int, size),
		junkDatas3: make([]int, size),
		junkDatas4: make([]int, size),
		junkDatas5: make([]int, size),
		junkDatas6: make([]int, size),
		junkDatas7: make([]int, size),
		junkDatas8: make([]int, size),
		junkDatas9: make([]int, size),
	}
	for i := 0; i < size; i++ {
		player.IDs[i] = i
		player.manas[i] = rnd.Intn(1000)
	}

	return player
}

Benchmark adaletsiz olmus , generateplayers length'iyle initialize edildiginden cikti slice inin lengthi 20.000 . Birde 3'den fazla field a erisim yapilinca std'a gore kasiyor :l

BenchmarkPlayerStd-12 42963 26838 ns/op 30 B/op 0 allocs/op
BenchmarkPlayerDoD-12 286344 4186 ns/op 4 B/op 0 allocs/op

BenchmarkSearchPlayerStd-12 146473 7930 ns/op 8 B/op 0 allocs/op
BenchmarkSeachPlayerDoD-12 455161 2388 ns/op 2 B/op 0 allocs/op

https://go.dev/play/p/yGCoaOp-vzn