Исходники и презентации

lessons/allocator/allocation_effect_2/allocation_test.go

@@ -0,0 +1,43 @@
+package main
+
+import "testing"
+
+// go test -bench=. -benchmem
+
+const bufferSize = 10
+
+type ReaderWithSliceArgument struct{}
+
+func (r ReaderWithSliceArgument) Read(p []byte) (int, error) {
+	for i := 0; i < bufferSize; i++ {
+		p[i] = byte(i)
+	}
+
+	return bufferSize, nil
+}
+
+type ReaderWithSliceReturn struct{}
+
+func (r ReaderWithSliceReturn) Read(n int) ([]byte, error) {
+	p := make([]byte, n)
+	for i := 0; i < n; i++ {
+		p[i] = byte(i)
+	}
+
+	return p, nil
+}
+
+func BenchmarkSliceWithArgument(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		p := make([]byte, bufferSize)
+		reader := ReaderWithSliceArgument{}
+		_, _ = reader.Read(p)
+	}
+}
+
+func BenchmarkSliceWithReturn(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		reader := ReaderWithSliceReturn{}
+		_, _ = reader.Read(bufferSize)
+	}
+}