Исходники и презентации

lessons/maps/big_map/main.go

@@ -0,0 +1,32 @@
+package main
+
+import (
+	"fmt"
+	"runtime"
+)
+
+func printAllocs() {
+	var m runtime.MemStats
+	runtime.ReadMemStats(&m)
+	fmt.Printf("%d MB\n", m.Alloc/1024/1024)
+}
+
+func main() {
+	printAllocs()
+	data := make(map[int][128]byte) // try to use 129
+	printAllocs()
+
+	for i := 0; i < 1_000_000; i++ {
+		data[i] = [128]byte{}
+	}
+
+	printAllocs()
+
+	for i := 0; i < 1_000_000; i++ {
+		delete(data, i)
+	}
+
+	runtime.GC()
+	printAllocs()
+	runtime.KeepAlive(data)
+}