+++ /dev/null
-package lru
-
-import (
- "math/rand"
- "testing"
- "time"
-)
-
-func init() {
- rand.Seed(time.Now().Unix())
-}
-
-func BenchmarkARC_Rand(b *testing.B) {
- l, err := NewARC(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 BenchmarkARC_Freq(b *testing.B) {
- l, err := NewARC(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 TestARC_RandomOps(t *testing.T) {
- size := 128
- l, err := NewARC(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.t1.Len()+l.t2.Len() > size {
- t.Fatalf("bad: t1: %d t2: %d b1: %d b2: %d p: %d",
- l.t1.Len(), l.t2.Len(), l.b1.Len(), l.b2.Len(), l.p)
- }
- if l.b1.Len()+l.b2.Len() > size {
- t.Fatalf("bad: t1: %d t2: %d b1: %d b2: %d p: %d",
- l.t1.Len(), l.t2.Len(), l.b1.Len(), l.b2.Len(), l.p)
- }
- }
-}
-
-func TestARC_Get_RecentToFrequent(t *testing.T) {
- l, err := NewARC(128)
- if err != nil {
- t.Fatalf("err: %v", err)
- }
-
- // Touch all the entries, should be in t1
- for i := 0; i < 128; i++ {
- l.Add(i, i)
- }
- if n := l.t1.Len(); n != 128 {
- t.Fatalf("bad: %d", n)
- }
- if n := l.t2.Len(); n != 0 {
- t.Fatalf("bad: %d", n)
- }
-
- // Get should upgrade to t2
- for i := 0; i < 128; i++ {
- _, ok := l.Get(i)
- if !ok {
- t.Fatalf("missing: %d", i)
- }
- }
- if n := l.t1.Len(); n != 0 {
- t.Fatalf("bad: %d", n)
- }
- if n := l.t2.Len(); n != 128 {
- t.Fatalf("bad: %d", n)
- }
-
- // Get be from t2
- for i := 0; i < 128; i++ {
- _, ok := l.Get(i)
- if !ok {
- t.Fatalf("missing: %d", i)
- }
- }
- if n := l.t1.Len(); n != 0 {
- t.Fatalf("bad: %d", n)
- }
- if n := l.t2.Len(); n != 128 {
- t.Fatalf("bad: %d", n)
- }
-}
-
-func TestARC_Add_RecentToFrequent(t *testing.T) {
- l, err := NewARC(128)
- if err != nil {
- t.Fatalf("err: %v", err)
- }
-
- // Add initially to t1
- l.Add(1, 1)
- if n := l.t1.Len(); n != 1 {
- t.Fatalf("bad: %d", n)
- }
- if n := l.t2.Len(); n != 0 {
- t.Fatalf("bad: %d", n)
- }
-
- // Add should upgrade to t2
- l.Add(1, 1)
- if n := l.t1.Len(); n != 0 {
- t.Fatalf("bad: %d", n)
- }
- if n := l.t2.Len(); n != 1 {
- t.Fatalf("bad: %d", n)
- }
-
- // Add should remain in t2
- l.Add(1, 1)
- if n := l.t1.Len(); n != 0 {
- t.Fatalf("bad: %d", n)
- }
- if n := l.t2.Len(); n != 1 {
- t.Fatalf("bad: %d", n)
- }
-}
-
-func TestARC_Adaptive(t *testing.T) {
- l, err := NewARC(4)
- if err != nil {
- t.Fatalf("err: %v", err)
- }
-
- // Fill t1
- for i := 0; i < 4; i++ {
- l.Add(i, i)
- }
- if n := l.t1.Len(); n != 4 {
- t.Fatalf("bad: %d", n)
- }
-
- // Move to t2
- l.Get(0)
- l.Get(1)
- if n := l.t2.Len(); n != 2 {
- t.Fatalf("bad: %d", n)
- }
-
- // Evict from t1
- l.Add(4, 4)
- if n := l.b1.Len(); n != 1 {
- t.Fatalf("bad: %d", n)
- }
-
- // Current state
- // t1 : (MRU) [4, 3] (LRU)
- // t2 : (MRU) [1, 0] (LRU)
- // b1 : (MRU) [2] (LRU)
- // b2 : (MRU) [] (LRU)
-
- // Add 2, should cause hit on b1
- l.Add(2, 2)
- if n := l.b1.Len(); n != 1 {
- t.Fatalf("bad: %d", n)
- }
- if l.p != 1 {
- t.Fatalf("bad: %d", l.p)
- }
- if n := l.t2.Len(); n != 3 {
- t.Fatalf("bad: %d", n)
- }
-
- // Current state
- // t1 : (MRU) [4] (LRU)
- // t2 : (MRU) [2, 1, 0] (LRU)
- // b1 : (MRU) [3] (LRU)
- // b2 : (MRU) [] (LRU)
-
- // Add 4, should migrate to t2
- l.Add(4, 4)
- if n := l.t1.Len(); n != 0 {
- t.Fatalf("bad: %d", n)
- }
- if n := l.t2.Len(); n != 4 {
- t.Fatalf("bad: %d", n)
- }
-
- // Current state
- // t1 : (MRU) [] (LRU)
- // t2 : (MRU) [4, 2, 1, 0] (LRU)
- // b1 : (MRU) [3] (LRU)
- // b2 : (MRU) [] (LRU)
-
- // Add 4, should evict to b2
- l.Add(5, 5)
- if n := l.t1.Len(); n != 1 {
- t.Fatalf("bad: %d", n)
- }
- if n := l.t2.Len(); n != 3 {
- t.Fatalf("bad: %d", n)
- }
- if n := l.b2.Len(); n != 1 {
- t.Fatalf("bad: %d", n)
- }
-
- // Current state
- // t1 : (MRU) [5] (LRU)
- // t2 : (MRU) [4, 2, 1] (LRU)
- // b1 : (MRU) [3] (LRU)
- // b2 : (MRU) [0] (LRU)
-
- // Add 0, should decrease p
- l.Add(0, 0)
- if n := l.t1.Len(); n != 0 {
- t.Fatalf("bad: %d", n)
- }
- if n := l.t2.Len(); n != 4 {
- t.Fatalf("bad: %d", n)
- }
- if n := l.b1.Len(); n != 2 {
- t.Fatalf("bad: %d", n)
- }
- if n := l.b2.Len(); n != 0 {
- t.Fatalf("bad: %d", n)
- }
- if l.p != 0 {
- t.Fatalf("bad: %d", l.p)
- }
-
- // Current state
- // t1 : (MRU) [] (LRU)
- // t2 : (MRU) [0, 4, 2, 1] (LRU)
- // b1 : (MRU) [5, 3] (LRU)
- // b2 : (MRU) [0] (LRU)
-}
-
-func TestARC(t *testing.T) {
- l, err := NewARC(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 TestARC_Contains(t *testing.T) {
- l, err := NewARC(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 TestARC_Peek(t *testing.T) {
- l, err := NewARC(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")
- }
-}
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