Исходники и презентации

lessons/allocator/allocations_size/main.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"fmt"
+	"testing"
+)
+
+var result string
+var buffer []byte = make([]byte, 33)
+
+func Concat(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		result = string(buffer) + string(buffer)
+	}
+}
+
+func main() {
+	b := testing.Benchmark(Concat)
+	fmt.Println(b.AllocsPerOp())       // 3
+	fmt.Println(b.AllocedBytesPerOp()) // 176
+
+	// alocated 176 bytes = 48 (not 33) + 48 (not 33) + 80 (not 33 + 33 = 66)
+	// waste = 15 + 15 + 14 = 44 bytes (25% waste)
+}