2q_test.go

package lru

import (
	"math/rand"
	"testing"
)

func Benchmark2Q_Rand(b *testing.B) {
	l, err := New2Q(8192)
	if err != nil {
		b.Fatalf("err: %v", err)
	}

	trace := make([]int64, b.N*2)
	for i := 0; i < b.N*2; i++ {
		trace[i] = rand.Int63() % 32768
	}

	b.ResetTimer()

	var hit, miss int
	for i := 0; i < 2*b.N; i++ {
		if i%2 == 0 {
			l.Add(trace[i], trace[i])
		} else {
			_, ok := l.Get(trace[i])
			if ok {
				hit++
			} else {
				miss++
			}
		}
	}
	b.Logf("hit: %d miss: %d ratio: %f", hit, miss, float64(hit)/float64(miss))
}

func Benchmark2Q_Freq(b *testing.B) {
	l, err := New2Q(8192)
	if err != nil {
		b.Fatalf("err: %v", err)
	}

	trace := make([]int64, b.N*2)
	for i := 0; i < b.N*2; i++ {
		if i%2 == 0 {
			trace[i] = rand.Int63() % 16384
		} else {
			trace[i] = rand.Int63() % 32768
		}
	}

	b.ResetTimer()

	for i := 0; i < b.N; i++ {
		l.Add(trace[i], trace[i])
	}
	var hit, miss int
	for i := 0; i < b.N; i++ {
		_, ok := l.Get(trace[i])
		if ok {
			hit++
		} else {
			miss++
		}
	}
	b.Logf("hit: %d miss: %d ratio: %f", hit, miss, float64(hit)/float64(miss))
}

func Test2Q_RandomOps(t *testing.T) {
	size := 128
	l, err := New2Q(128)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	n := 200000
	for i := 0; i < n; i++ {
		key := rand.Int63() % 512
		r := rand.Int63()
		switch r % 3 {
		case 0:
			l.Add(key, key)
		case 1:
			l.Get(key)
		case 2:
			l.Remove(key)
		}

		if l.Len() > size {
			t.Fatalf("bad: expected %d, got %d",
				size, l.Len())
		}
	}
}

func Test2Q(t *testing.T) {
	l, err := New2Q(128)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	for i := 0; i < 256; i++ {
		l.Add(i, i)
	}
	if l.Len() != 128 {
		t.Fatalf("bad len: %v", l.Len())
	}

	for i, k := range l.Keys() {
		if v, ok := l.Get(k); !ok || v != k || v != i+128 {
			t.Fatalf("bad key: %v", k)
		}
	}
	for i := 0; i < 128; i++ {
		_, ok := l.Get(i)
		if ok {
			t.Fatalf("should be evicted")
		}
	}
	for i := 128; i < 256; i++ {
		_, ok := l.Get(i)
		if !ok {
			t.Fatalf("should not be evicted")
		}
	}
	for i := 128; i < 192; i++ {
		l.Remove(i)
		_, ok := l.Get(i)
		if ok {
			t.Fatalf("should be deleted")
		}
	}

	l.Purge()
	if l.Len() != 0 {
		t.Fatalf("bad len: %v", l.Len())
	}
	if _, ok := l.Get(200); ok {
		t.Fatalf("should contain nothing")
	}
}

// Test that Contains doesn't update recent-ness
func Test2Q_Contains(t *testing.T) {
	l, err := New2Q(2)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	l.Add(1, 1)
	l.Add(2, 2)
	if !l.Contains(1) {
		t.Errorf("1 should be contained")
	}

	l.Add(3, 3)
	if l.Contains(1) {
		t.Errorf("Contains should not have updated recent-ness of 1")
	}
}

// Test that Peek doesn't update recent-ness
func Test2Q_Peek(t *testing.T) {
	l, err := New2Q(2)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	l.Add(1, 1)
	l.Add(2, 2)
	if v, ok := l.Peek(1); !ok || v != 1 {
		t.Errorf("1 should be set to 1: %v, %v", v, ok)
	}

	l.Add(3, 3)
	if l.Contains(1) {
		t.Errorf("should not have updated recent-ness of 1")
	}
}