Исходники и презентации

lessons/structs/dod/comparison_test.go

@@ -0,0 +1,107 @@
+package main
+
+import (
+	"fmt"
+	"math/rand"
+	"testing"
+)
+
+// go test -bench=. comparison_test.go
+
+type OODStyle struct {
+	Field1 int
+	Field2 string
+	Field3 int
+	Field4 string
+	Field5 int
+	Field6 string
+	Field7 int
+	Field8 string
+}
+
+type DODStyle struct {
+	Field1 []int
+	Field2 []string
+	Field3 []int
+	Field4 []string
+	Field5 []int
+	Field6 []string
+	Field7 []int
+	Field8 []string
+}
+
+var Sink int
+
+func BenchmarkDOD(b *testing.B) {
+	r := rand.New(rand.NewSource(42))
+	data := generateDOD(r, 1_000_000)
+	b.ResetTimer()
+
+	Sink = 0
+	for i := 0; i < b.N; i++ {
+		for j, f1 := range data.Field1 {
+			if f1 == 500000 {
+				Sink = j
+			}
+		}
+	}
+}
+
+func BenchmarkOOD(b *testing.B) {
+	r := rand.New(rand.NewSource(42))
+	data := generateOOD(r, 1_000_000)
+	b.ResetTimer()
+
+	Sink = 0
+	for i := 0; i < b.N; i++ {
+		for j, ant := range data {
+			if ant.Field1 == 500000 {
+				Sink = j
+			}
+		}
+	}
+}
+
+func generateOOD(r *rand.Rand, size int) []OODStyle {
+	data := make([]OODStyle, size)
+	for i := range data {
+		data[i] = OODStyle{
+			Field1: r.Intn(1000),
+			Field2: fmt.Sprintf("field2-%d", r.Intn(1000)),
+			Field3: r.Intn(1000),
+			Field4: fmt.Sprintf("field4-%d", r.Intn(1000)),
+			Field5: r.Intn(1000),
+			Field6: fmt.Sprintf("field6-%d", r.Intn(1000)),
+			Field7: r.Intn(1000),
+			Field8: fmt.Sprintf("fiel8-%d", r.Intn(1000)),
+		}
+	}
+
+	return data
+}
+
+func generateDOD(r *rand.Rand, size int) DODStyle {
+	data := DODStyle{
+		Field1: make([]int, size),
+		Field2: make([]string, size),
+		Field3: make([]int, size),
+		Field4: make([]string, size),
+		Field5: make([]int, size),
+		Field6: make([]string, size),
+		Field7: make([]int, size),
+		Field8: make([]string, size),
+	}
+
+	for i := 0; i < size; i++ {
+		data.Field1[i] = r.Intn(1000)
+		data.Field2[i] = fmt.Sprintf("field2-%d", r.Intn(1000))
+		data.Field3[i] = r.Intn(1000)
+		data.Field4[i] = fmt.Sprintf("field4-%d", r.Intn(1000))
+		data.Field5[i] = r.Intn(1000)
+		data.Field6[i] = fmt.Sprintf("field6-%d", r.Intn(1000))
+		data.Field7[i] = r.Intn(1000)
+		data.Field8[i] = fmt.Sprintf("fiel8-%d", r.Intn(1000))
+	}
+
+	return data
+}