Vai encoding benchmark (#742)

Also includes some misc changes.

pkg/sqlcache/db/encoding_test.go

@@ -0,0 +1,163 @@
+package db
+
+import (
+	"bytes"
+	"io"
+	"math/rand"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+var random = rand.New(rand.NewSource(0))
+
+func TestEquality(t *testing.T) {
+	testObject := &corev1.Pod{
+		ObjectMeta: metav1.ObjectMeta{
+			Namespace:   "default",
+			Name:        "test",
+			Annotations: map[string]string{"annotation": "test"},
+			Labels:      map[string]string{"label": "test"},
+		},
+		Spec: corev1.PodSpec{
+			Containers: []corev1.Container{{
+				Name:  "test",
+				Image: "testimage",
+				VolumeMounts: []corev1.VolumeMount{{
+					Name:      "test",
+					MountPath: "/test",
+				}},
+			}},
+			Volumes: []corev1.Volume{{
+				Name: "test",
+				VolumeSource: corev1.VolumeSource{
+					EmptyDir: &corev1.EmptyDirVolumeSource{},
+				},
+			}},
+		},
+	}
+	tests := []struct {
+		name     string
+		encoding encoding
+	}{
+		{name: "gob", encoding: &gobEncoding{}},
+		{name: "json", encoding: &jsonEncoding{}},
+		{name: "gob+gz", encoding: gzipped(&gobEncoding{})},
+		{name: "json+gz", encoding: gzipped(&jsonEncoding{})},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var buf bytes.Buffer
+			if err := tt.encoding.Encode(&buf, testObject); err != nil {
+				t.Fatal(err)
+			}
+			var dest *corev1.Pod
+			if err := tt.encoding.Decode(bytes.NewReader(buf.Bytes()), &dest); err != nil {
+				t.Fatal(err)
+			}
+			assert.Equal(t, testObject, dest)
+		})
+	}
+}
+
+func BenchmarkEncodings(b *testing.B) {
+	cm := &corev1.ConfigMap{
+		ObjectMeta: metav1.ObjectMeta{
+			Namespace: "default",
+			Name:      "test",
+		},
+		// a single entry map with 10K zero characters should account for ~10KB ConfigMap size,
+		Data: generateTestData(10000),
+	}
+	pod := &corev1.Pod{
+		ObjectMeta: metav1.ObjectMeta{
+			Namespace:   "default",
+			Name:        "test",
+			Annotations: map[string]string{"annotation": "test"},
+			Labels:      map[string]string{"label": "test"},
+		},
+		Spec: corev1.PodSpec{
+			Containers: []corev1.Container{{
+				Name:  "test",
+				Image: "testimage",
+				VolumeMounts: []corev1.VolumeMount{{
+					Name:      "test",
+					MountPath: "/test",
+				}},
+			}},
+			Volumes: []corev1.Volume{{
+				Name: "test",
+				VolumeSource: corev1.VolumeSource{
+					EmptyDir: &corev1.EmptyDirVolumeSource{},
+				},
+			}},
+		},
+	}
+
+	tests := []struct {
+		name       string
+		encoding   encoding
+		testObject any
+	}{
+		{name: "gob", encoding: &gobEncoding{}},
+		{name: "json", encoding: &jsonEncoding{}},
+		{name: "gob+gzip", encoding: gzipped(&gobEncoding{})},
+		{name: "json+gzip", encoding: gzipped(&jsonEncoding{})},
+	}
+	for _, tt := range tests {
+		for objType, testObject := range map[string]any{
+			"10KB-configmap": cm,
+			"pod":            pod,
+		} {
+			b.Run(tt.name+"-"+objType, func(b *testing.B) {
+				b.Run("encoding", func(b *testing.B) {
+					for b.Loop() {
+						w := new(discardWriter)
+						if err := tt.encoding.Encode(w, testObject); err != nil {
+							b.Error(err)
+						}
+						b.ReportMetric(float64(w.count), "bytes")
+					}
+				})
+
+				var buf bytes.Buffer
+				if err := tt.encoding.Encode(&buf, testObject); err != nil {
+					b.Fatal(err)
+				}
+				serialized := buf.Bytes()
+				b.Run("decoding", func(b *testing.B) {
+					var dest corev1.ConfigMap
+					for b.Loop() {
+						if err := tt.encoding.Decode(bytes.NewReader(serialized), &dest); err != nil {
+							b.Fatal(err)
+						}
+					}
+				})
+			})
+		}
+	}
+}
+
+type discardWriter struct {
+	count int
+}
+
+func (d *discardWriter) Write(p []byte) (int, error) {
+	n, err := io.Discard.Write(p)
+	d.count += n
+	return n, err
+}
+
+// single-entry map, whose value is a randomly-generated string of n size
+func generateTestData(n int) map[string]string {
+	const letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+	b := make([]byte, n)
+	for i := range b {
+		b[i] = letters[random.Int63()%int64(len(letters))]
+	}
+	return map[string]string{
+		"data": string(b),
+	}
+}