s1d3sw1ped
ffa9aa04f7
- 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.
420 lines
10 KiB
Go
420 lines
10 KiB
Go
package memory
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import (
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"fmt"
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"io"
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"sync"
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"sync/atomic"
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"testing"
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"time"
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)
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func TestMemoryFS_Basic(t *testing.T) {
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t.Parallel()
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m := New(1024 * 1024)
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if m.Name() != "MemoryFS" {
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t.Error("bad name")
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}
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if m.Capacity() != 1024*1024 {
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t.Error("bad cap")
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}
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w, err := m.Create("k1", 100)
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if err != nil {
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t.Fatal(err)
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}
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n, _ := w.Write(make([]byte, 100))
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w.Close()
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if n != 100 {
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t.Error("write len")
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}
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if m.Size() != 100 {
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t.Errorf("size=%d want 100", m.Size())
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}
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r, err := m.Open("k1")
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if err != nil {
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t.Fatal(err)
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}
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data, _ := io.ReadAll(r)
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r.Close()
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if len(data) != 100 {
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t.Error("read mismatch")
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}
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if err := m.Delete("k1"); err != nil {
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t.Fatal(err)
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}
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if _, err := m.Open("k1"); err == nil {
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t.Error("deleted key still openable")
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}
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}
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func TestMemoryFS_EvictUnderPressure(t *testing.T) {
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t.Parallel()
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m := New(500)
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// create 3x200 = 600 >500, should trigger internal? but direct evict call
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for i := 0; i < 3; i++ {
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w, _ := m.Create("f"+string(rune('0'+i)), 200)
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w.Write(make([]byte, 200))
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w.Close()
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}
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// force evict
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evicted := m.EvictLRU(100)
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if evicted == 0 || m.Size() > 500 {
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t.Errorf("evict failed: evicted=%d size=%d", evicted, m.Size())
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}
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}
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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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// 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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w, err := m.Create(testKey(i), sz)
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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, sz))
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w.Close()
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// Raw MemoryFS allows temporary over (enforced by GCFS wrapper in real use).
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// Force evict under pressure and verify post-evict invariant.
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if m.Size() > cap-50 {
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fn := strats[i%len(strats)]
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fn(200)
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if m.Size() > cap+50 { // RLock snapshot + batch may temporarily exceed; GC layer enforces strict limit
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t.Fatalf("size %d >> cap %d after evict", m.Size(), cap)
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}
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}
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}
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}
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func TestMemoryFS_ConcurrentCreateOpenDelete(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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m := New(10 * 1024 * 1024)
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var wg sync.WaitGroup
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const N = 50
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var ops int64
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for i := 0; i < 8; i++ {
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wg.Add(1)
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go func(id int) {
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defer wg.Done()
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for j := 0; j < N; j++ {
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key := "c" + string(rune('a'+id)) + string(rune(j%10))
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w, err := m.Create(key, 128)
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if err == nil {
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w.Write(make([]byte, 128))
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w.Close()
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atomic.AddInt64(&ops, 1)
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}
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if r, err := m.Open(key); err == nil {
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io.Copy(io.Discard, r)
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r.Close()
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atomic.AddInt64(&ops, 1)
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}
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_ = m.Delete(key)
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atomic.AddInt64(&ops, 1)
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if j%10 == 0 {
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m.EvictLRU(256)
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}
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}
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}(i)
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}
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wg.Wait()
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if ops < 100 {
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t.Errorf("too few concurrent ops: %d", ops)
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}
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// size should be bounded
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if m.Size() > m.Capacity() {
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t.Errorf("final size %d > cap", m.Size())
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}
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}
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func BenchmarkMemoryFS_CreateOpen(b *testing.B) {
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m := New(64 * 1024 * 1024)
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data := make([]byte, 4096)
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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 := 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, 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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// 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, 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.EvictLRU(512 * 1024)
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}
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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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stats := m.GetFragmentationStats()
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if stats["buffer_count"] != 0 {
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t.Error("initial buffers >0?")
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}
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}
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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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// TestMemoryFS_ConcurrentCloseAndEvict_RaceFree is a synthetic load test exercising concurrent Close during eviction (validates the R/W split fixes).
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// Exercises overlapping writer Close() (mutates fi.Size under W) + all Evict* strategies under load.
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// Must be -race clean; also strengthens property coverage.
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func TestMemoryFS_ConcurrentCloseAndEvict_RaceFree(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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m := New(2 * 1024 * 1024) // 2MB
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var wg sync.WaitGroup
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stopCh := make(chan struct{})
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const writers = 3
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const evictors = 3
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// Writers: create + write + close (triggers size mutation in Close)
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for i := 0; i < writers; i++ {
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wg.Add(1)
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go func(id int) {
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defer wg.Done()
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for j := 0; ; j++ {
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select {
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case <-stopCh:
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return
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default:
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}
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key := testKey(id*10000 + j)
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w, err := m.Create(key, 4096)
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if err == nil {
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w.Write(make([]byte, 4096))
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w.Close() // mutates live *FileInfo.Size + global size (race target)
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}
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if j%5 == 0 {
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m.Delete(key)
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}
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if j > 100 {
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break // bound per writer
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}
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}
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}(i)
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}
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// Evictors: hammer all 5 strategies + LRU (exercises snapshot copy + live re-fetch + short LRU Lock)
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strats := []func(uint) uint{
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m.EvictLRU,
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func(n uint) uint { return m.EvictBySize(n, true) },
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func(n uint) uint { return m.EvictBySize(n, false) },
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m.EvictFIFO,
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m.EvictLFU,
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m.EvictHybrid,
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}
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for i := 0; i < evictors; i++ {
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wg.Add(1)
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go func(id int) {
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defer wg.Done()
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for j := 0; ; j++ {
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select {
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case <-stopCh:
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return
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default:
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}
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s := strats[j%len(strats)]
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s(1024)
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if j > 50 {
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break
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}
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}
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}(i)
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}
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time.Sleep(150 * time.Millisecond) // load duration; bounded
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close(stopCh)
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wg.Wait()
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// Post-run invariants (loose due to raw MemoryFS overcommit design; GCFS enforces)
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if m.Size() < 0 {
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t.Error("negative size after concurrent close+evict")
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}
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// LRU len reasonable
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_ = m.LRU.Len()
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}
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func TestMemoryFS_EvictVariantsAndErrors(t *testing.T) {
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t.Parallel()
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m := New(800)
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// populate
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for i := 0; i < 4; i++ {
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w, _ := m.Create("ev"+string(rune('0'+i)), 150)
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w.Write(make([]byte, 150))
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w.Close()
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}
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_ = m.EvictBySize(100, true) // smallest
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_ = m.EvictFIFO(50)
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_ = m.EvictLFU(50)
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_ = m.EvictHybrid(50)
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// invalid keys
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if _, err := m.Create("", 1); err == nil {
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t.Error("empty key allowed")
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}
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if _, err := m.Create("/abs", 1); err == nil {
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t.Error("abs key allowed")
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}
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if _, err := m.Create("..bad", 1); err == nil {
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t.Error("traversal key allowed")
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}
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if _, err := m.Open("nope"); err == nil {
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t.Error("open missing")
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}
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if err := m.Delete("nope"); err == nil {
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t.Error("delete missing")
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}
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if _, err := m.Stat("nope"); err == nil {
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t.Error("stat missing")
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}
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// overwrite path + actual size update via closer
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w2, _ := m.Create("ow", 10)
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w2.Write([]byte{1, 2, 3})
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w2.Close() // updates to real 3
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if fi, _ := m.Stat("ow"); fi.Size != 3 {
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t.Errorf("overwrite size %d !=3", fi.Size)
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}
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// hit fragmentation stats after activity
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_ = m.GetFragmentationStats()
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}
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func TestMemoryFS_AllEvictStrategies(t *testing.T) {
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t.Parallel()
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m := New(300)
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for i := 0; i < 3; i++ {
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w, _ := m.Create("s"+string(rune(i)), 120)
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w.Write(make([]byte, 120))
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w.Close()
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}
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_ = m.EvictBySize(50, true)
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_ = m.EvictBySize(50, false)
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_ = m.EvictFIFO(20)
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_ = m.EvictLFU(20)
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_ = m.EvictHybrid(20)
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if m.Size() > m.Capacity() {
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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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