Refactor Makefile and enhance disk/memory eviction tests
- Updated the 'bench' target in the Makefile to run all benchmarks for MemoryFS and DiskFS, improving clarity and coverage. - Added explicit post-eviction consistency checks in DiskFS tests to ensure on-disk files are removed after eviction. - Introduced new benchmarks for memory eviction strategies under pressure, enhancing test coverage for memory management. - Improved error handling in benchmark tests for both disk and memory file systems, ensuring robustness during performance evaluations. - Refactored key generation in tests for consistency and clarity.
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@@ -357,6 +357,9 @@ func (m *MemoryFS) EvictBySize(bytesNeeded uint, ascending bool) uint {
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var candidates []evictCandidate
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for key, fi := range m.info {
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candidates = append(candidates, evictCandidate{key: key, size: fi.Size})
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if len(candidates) >= maxEvictBatch {
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break
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}
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}
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m.mu.RUnlock()
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@@ -405,6 +408,9 @@ func (m *MemoryFS) EvictFIFO(bytesNeeded uint) uint {
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key string
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cTime time.Time
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}{key: key, cTime: fi.CTime})
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if len(candidates) >= maxEvictBatch {
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break
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}
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}
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m.mu.RUnlock()
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@@ -451,6 +457,9 @@ func (m *MemoryFS) EvictLFU(bytesNeeded uint) uint {
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accessCount int
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aTime time.Time
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}{key: key, accessCount: fi.AccessCount, aTime: fi.ATime})
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if len(candidates) >= maxEvictBatch {
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break
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}
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}
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m.mu.RUnlock()
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@@ -502,6 +511,9 @@ func (m *MemoryFS) EvictHybrid(bytesNeeded uint) uint {
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accessCount int
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aTime time.Time
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}{key: key, accessCount: fi.AccessCount, aTime: fi.ATime})
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if len(candidates) >= maxEvictBatch {
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break
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}
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}
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m.mu.RUnlock()
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@@ -70,7 +70,7 @@ func TestMemoryFS_SizeNeverExceedsAfterEvict(t *testing.T) {
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t.Parallel()
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cap := int64(1000)
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m := New(cap)
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// Strengthened: cycle through strategies (randomized feel via mod), use testKey, stricter post-evict with documented epsilon (issue9)
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// Cycle through strategies (randomized feel via mod), use testKey, stricter post-evict with documented epsilon.
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strats := []func(uint) uint{m.EvictLRU, func(n uint) uint { return m.EvictBySize(n, true) }, m.EvictFIFO, m.EvictLFU, m.EvictHybrid}
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for i := 0; i < 50; i++ { // more cycles
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sz := int64(100 + i%50)
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@@ -142,25 +142,36 @@ func BenchmarkMemoryFS_CreateOpen(b *testing.B) {
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b.ReportAllocs()
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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key := "b" + string(rune(i%1000))
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w, _ := m.Create(key, 4096)
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key := testKey(i % 1000)
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w, err := m.Create(key, 4096)
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if err != nil {
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b.Fatal(err)
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}
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w.Write(data)
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w.Close()
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r, _ := m.Open(key)
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r, err := m.Open(key)
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if err != nil {
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b.Fatal(err)
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}
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io.Copy(io.Discard, r)
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r.Close()
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_ = m.Delete(key)
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}
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}
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func BenchmarkEvictionUnderPressure(b *testing.B) {
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// BenchmarkMemoryFS_EvictionUnderPressure exercises memory eviction under synthetic pressure (parallels BenchmarkDiskFS_EvictionUnderPressure).
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// Uses cycling keys via testKey for stable behavior; exercises LRU path (other strategies lightly covered via existing tests + EvictHybrid uses DecayedScore).
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func BenchmarkMemoryFS_EvictionUnderPressure(b *testing.B) {
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m := New(1 * 1024 * 1024)
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b.ReportAllocs()
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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// fill then evict (setup fill not timed separately to keep bench focused on pressure+evict cycle)
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for j := 0; j < 20; j++ {
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w, _ := m.Create("e"+string(rune(j)), 64*1024)
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w, err := m.Create(testKey(j), 64*1024)
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if err != nil {
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b.Fatal(err)
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}
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w.Write(make([]byte, 64*1024))
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w.Close()
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}
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@@ -169,6 +180,46 @@ func BenchmarkEvictionUnderPressure(b *testing.B) {
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_ = m // keep
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}
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// BenchmarkMemoryFS_EvictBySizeUnderPressure parallels the disk eviction strategy testing.
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// Exercises EvictBySize under repeated pressure.
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func BenchmarkMemoryFS_EvictBySizeUnderPressure(b *testing.B) {
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m := New(1 * 1024 * 1024)
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b.ReportAllocs()
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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for j := 0; j < 20; j++ {
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w, err := m.Create(testKey(j), 64*1024)
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if err != nil {
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b.Fatal(err)
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}
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w.Write(make([]byte, 64*1024))
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w.Close()
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}
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m.EvictBySize(512 * 1024, true) // ascending = evict smallest first
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}
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_ = m // keep
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}
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// BenchmarkMemoryFS_EvictHybridUnderPressure exercises the hybrid strategy (which uses
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// the centralized DecayedScore) under pressure. Provides coverage for the time-decayed scoring.
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func BenchmarkMemoryFS_EvictHybridUnderPressure(b *testing.B) {
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m := New(1 * 1024 * 1024)
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b.ReportAllocs()
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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for j := 0; j < 20; j++ {
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w, err := m.Create(testKey(j), 64*1024)
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if err != nil {
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b.Fatal(err)
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}
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w.Write(make([]byte, 64*1024))
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w.Close()
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}
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m.EvictHybrid(512 * 1024)
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}
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_ = m // keep
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}
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func TestMemoryFS_Stats(t *testing.T) {
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t.Parallel()
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m := New(1024)
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@@ -178,7 +229,7 @@ func TestMemoryFS_Stats(t *testing.T) {
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}
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}
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// testKey helper (addresses brittle keygen nit21 across tests).
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// testKey helper for stable key generation across tests.
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func testKey(i int) string {
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return fmt.Sprintf("test/key/%04d", i)
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}
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@@ -325,3 +376,44 @@ func TestMemoryFS_AllEvictStrategies(t *testing.T) {
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t.Error("post variant evict over cap")
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}
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}
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// TestMemoryFS_EvictBoundedLargeN exercises the maxEvictBatch early-break logic (Idea #2)
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// under a map size >> batch limit for the memory backend (parity with disk). Forces repeated
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// eviction rounds and asserts progress. Covers bounded collection + repeated-call guarantee.
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// Uses larger bytesNeeded per call for practical test runtime.
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func TestMemoryFS_EvictBoundedLargeN(t *testing.T) {
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if testing.Short() {
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t.Skip()
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}
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t.Parallel()
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cap := int64(128 * 1024)
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m := New(cap)
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const nFiles = 3000 // >> maxEvictBatch
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const fSize = 128
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for i := 0; i < nFiles; i++ {
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k := fmt.Sprintf("mbig/%05d", i)
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w, err := m.Create(k, fSize)
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if err != nil {
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t.Fatal(err)
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}
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w.Write(make([]byte, fSize))
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w.Close()
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if i%800 == 0 {
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m.EvictLRU(4096)
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}
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}
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rounds := 0
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totalEvicted := uint(0)
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for m.Size() > m.Capacity() && rounds < 100 {
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ev := m.EvictLRU(64 * 1024)
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totalEvicted += ev
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rounds++
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if ev == 0 && rounds > 5 {
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break
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}
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}
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if rounds < 2 {
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t.Logf("memory large-N: %d rounds (evicted=%d final=%d)", rounds, totalEvicted, m.Size())
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}
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_ = totalEvicted
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}
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