Исходники и презентации

lessons/slices_and_arrays/slice_of_slices/main.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"fmt"
+	"runtime"
+)
+
+type Data struct {
+	values []byte
+}
+
+func printAllocs() {
+	var m runtime.MemStats
+	runtime.ReadMemStats(&m)
+	fmt.Printf("%d MB\n", m.Alloc/1024/1024)
+}
+
+func GetData() []Data {
+	data := make([]Data, 1000) // ~24KB
+
+	for i := 0; i < len(data); i++ {
+		data[i] = Data{
+			values: make([]byte, 1<<20),
+		}
+	}
+
+	clear(data[2:])
+	return data[:2]
+}
+
+func main() {
+	data := GetData()
+
+	printAllocs()
+	runtime.GC()
+	printAllocs()
+
+	runtime.KeepAlive(data)
+}