detached 407cac9

test(snapshot): verify incremental persistence performance

commit
407cac9c01c1e4c16b7633defe4c5b88614ab443
author
brice · · 2026-07-22 01:46 UTC
parent
e8e2f00
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GPG VerifiedCD88F9E564E0102646FB6077A1A07C7C7C3E349D · arch-gpg Verified for the committer email
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M internal/usecase/daemon/performance_benchmark_test.go +256 -45
@@ -14,6 +14,7 @@ import (
1414 "github.com/bnema/vev/internal/ports"
1515 "github.com/bnema/vev/internal/usecase/layout"
1616 snapcodec "github.com/bnema/vev/internal/usecase/snapshot"
17+ "github.com/bnema/vev/pkg/renderer"
1718 )
1819
1920 func TestCountingSnapshotRepositoryPublishCountsAndRetainsManifest(t *testing.T) {
@@ -22,13 +23,78 @@ func TestCountingSnapshotRepositoryPublishCountsAndRetainsManifest(t *testing.T)
2223 object := []byte{0x01, 0x02}
2324
2425 require.NoError(t, repository.Publish(context.Background(), ports.SnapshotPublication{Name: "session", Manifest: payload, Objects: []ports.SnapshotObject{{Data: object}}}))
25- require.Equal(t, countingSnapshotMetrics{writes: 1, manifestBytes: uint64(len(payload)), objectBytes: uint64(len(object))}, repository.metrics())
26+ require.Equal(t, countingSnapshotMetrics{writes: 1, manifestBytes: uint64(len(payload)), objectBytes: uint64(len(object)), headBytes: snapshotHeadBytes}, repository.metrics())
2627 require.Equal(t, payload, repository.lastPayload())
2728
2829 payload[0] = 0x01
2930 require.Equal(t, payload, repository.lastPayload(), "the counting sink must retain the payload slice header, not copy it")
3031 }
3132
33+func TestCountingSnapshotRepositoryDoesNotRewriteKnownObjects(t *testing.T) {
34+ repository := &countingSnapshotRepository{}
35+ object, err := snapcodec.MarshalObject(snapcodec.HistoryChunk, []byte{0x01})
36+ require.NoError(t, err)
37+ publication := ports.SnapshotPublication{Name: "session", Manifest: []byte("manifest"), Objects: []ports.SnapshotObject{object}}
38+
39+ require.NoError(t, repository.Publish(context.Background(), publication))
40+ repository.reset()
41+ require.NoError(t, repository.Publish(context.Background(), publication))
42+
43+ require.Zero(t, repository.metrics().objectBytes, "filesystem repositories retain immutable content-addressed objects")
44+}
45+
46+func TestIncrementalSnapshotMetricsWriteNoUnchangedHistoryBlobsAndBoundCache(t *testing.T) {
47+ fixture := newPerformanceFixture(t, performanceConfig{size: domain.Size{Cols: 120, Rows: 40}, panes: 1, historyRows: 10_000})
48+
49+ publishBenchmarkSnapshot(t, fixture, 1)
50+ fixture.snapshots.reset()
51+ publishBenchmarkSnapshot(t, fixture, 2)
52+
53+ metrics := fixture.snapshots.metrics()
54+ require.Zero(t, metrics.historyBlobBytes)
55+ require.Zero(t, metrics.objectBytes)
56+ require.Positive(t, metrics.manifestBytes)
57+ require.Equal(t, uint64(snapshotHeadBytes), metrics.headBytes)
58+ require.LessOrEqual(t, benchmarkSnapshotCacheBytes(fixture.sess), snapshotChunkCacheLimit)
59+}
60+
61+func TestIncrementalSnapshotMetricScenarios(t *testing.T) {
62+ for _, tt := range []struct {
63+ name string
64+ historyRows int
65+ mutate func(*performanceFixture, int)
66+ wantHistory bool
67+ }{
68+ {name: "tail-only", historyRows: 9_999, mutate: mutateBenchmarkTail},
69+ {name: "new-sealed-chunk", historyRows: 10_000, mutate: mutateBenchmarkSealedChunk, wantHistory: true},
70+ } {
71+ t.Run(tt.name, func(t *testing.T) {
72+ fixture := newPerformanceFixture(t, performanceConfig{size: domain.Size{Cols: 120, Rows: 40}, panes: 1, historyRows: tt.historyRows})
73+ publishBenchmarkSnapshot(t, fixture, 1)
74+ fixture.snapshots.reset()
75+ tt.mutate(fixture, 0)
76+ publishBenchmarkSnapshot(t, fixture, 2)
77+
78+ metrics := fixture.snapshots.metrics()
79+ if tt.wantHistory {
80+ require.Positive(t, metrics.historyBlobBytes)
81+ } else {
82+ require.Zero(t, metrics.historyBlobBytes)
83+ }
84+ require.LessOrEqual(t, benchmarkSnapshotCacheBytes(fixture.sess), snapshotChunkCacheLimit)
85+ })
86+ }
87+}
88+
89+func TestPerformanceFixtureCellLimitedHistory(t *testing.T) {
90+ fixture := newPerformanceFixture(t, performanceConfig{size: domain.Size{Cols: 293, Rows: 40}, panes: 1, historyRows: 10_000})
91+ fixture.activePane.mu.Lock()
92+ rows, cells, capCells := fixture.activePane.history.Len(), fixture.activePane.history.Cells(), fixture.activePane.history.CellCap()
93+ fixture.activePane.mu.Unlock()
94+ require.Less(t, rows, 10_000)
95+ require.LessOrEqual(t, cells, capCells)
96+}
97+
3298 func TestCountingOutputTransportCountsOpaquePayloadAndRejectsShortPayload(t *testing.T) {
3399 transport := &countingOutputTransport{}
34100
@@ -219,10 +285,16 @@ func BenchmarkDaemonHistorySnapshotCapture(b *testing.B) {
219285 benchmarkDaemonSnapshotCapture(b)
220286 }
221287
222-// BenchmarkDaemonHistorySnapshotEncode measures incremental publication from an
223-// already immutable capture, without queueing or persistence.
224-func BenchmarkDaemonHistorySnapshotEncode(b *testing.B) {
225- benchmarkDaemonSnapshotEncode(b)
288+// BenchmarkDaemonIncrementalSnapshotRepository measures the complete
289+// content-addressed publication path against a filesystem-equivalent byte
290+// counter. Each scenario reports persisted VEVO, VEVM, and VEVH bytes, plus
291+// allocation/time and the per-session encoded-history cache high-water mark.
292+func BenchmarkDaemonIncrementalSnapshotRepository(b *testing.B) {
293+ for _, scenario := range snapshotBenchmarkScenarios {
294+ b.Run(scenario.name, func(b *testing.B) {
295+ benchmarkIncrementalSnapshotRepository(b, scenario)
296+ })
297+ }
226298 }
227299
228300 // BenchmarkDaemonHistorySnapshotRestore measures terminal-state restoration
@@ -351,43 +423,156 @@ func benchmarkDaemonSnapshotCapture(b *testing.B) {
351423 }
352424 }
353425
354-func benchmarkDaemonSnapshotEncode(b *testing.B) {
355- for _, topology := range daemonSnapshotTopologies {
356- b.Run(topology.name, func(b *testing.B) {
357- fixture := newPerformanceFixture(b, performanceConfig{size: domain.Size{Cols: 120, Rows: 40}, tabs: topology.tabs, panes: topology.panes, historyRows: 10_000})
358- if !fixture.hasHistoryTopology(topology.tabs, topology.panes, 10_000) {
359- b.Fatal("invalid daemon snapshot publication fixture")
360- }
361- capture, ok := fixture.d.captureSnapshotState(fixture.sess, 1)
362- if !ok || !validBenchmarkCapture(capture) {
363- b.Fatal("invalid snapshot publication fixture")
364- }
365- publication, err := fixture.d.incrementalPublication(capture)
366- if err != nil {
367- b.Fatal(err)
368- }
369- if _, err := snapcodec.UnmarshalManifest(publication.Manifest); err != nil || len(publication.Objects) == 0 {
370- b.Fatalf("invalid incremental snapshot publication fixture: %v", err)
371- }
372- var last ports.SnapshotPublication
373- b.ReportAllocs()
374- b.SetBytes(int64(snapshotPublicationBytes(publication)))
375- b.ResetTimer()
376- for range b.N {
377- last, err = fixture.d.incrementalPublication(capture)
378- if err != nil {
379- b.Fatal(err)
380- }
381- }
382- b.StopTimer()
383- if _, err := snapcodec.UnmarshalManifest(last.Manifest); err != nil {
384- b.Fatalf("snapshot publication produced invalid manifest: %v", err)
385- }
386- b.ReportMetric(float64(len(last.Manifest)), "manifestbytes/op")
387- b.ReportMetric(float64(snapshotObjectBytes(last)), "objectbytes/op")
388- b.ReportMetric(float64(len(last.Objects)), "objects/op")
389- })
426+type snapshotBenchmarkScenario struct {
427+ name string
428+ size domain.Size
429+ historyRows int
430+ baseline bool
431+ mutate func(*performanceFixture, int)
432+ unchanged bool
433+ cellLimited bool
434+}
435+
436+var snapshotBenchmarkScenarios = []snapshotBenchmarkScenario{
437+ {name: "initial-10k-x-120", size: domain.Size{Cols: 120, Rows: 40}, historyRows: 10_000},
438+ {name: "unchanged", size: domain.Size{Cols: 120, Rows: 40}, historyRows: 10_000, baseline: true, unchanged: true},
439+ {name: "visible-only", size: domain.Size{Cols: 120, Rows: 40}, historyRows: 10_000, baseline: true, mutate: mutateBenchmarkVisible},
440+ // Leave one row below the retention cap so the mutation changes only the
441+ // mutable tail and cannot evict a sealed chunk.
442+ {name: "tail-only", size: domain.Size{Cols: 120, Rows: 40}, historyRows: 9_999, baseline: true, mutate: mutateBenchmarkTail},
443+ {name: "new-sealed-chunk", size: domain.Size{Cols: 120, Rows: 40}, historyRows: 10_000, baseline: true, mutate: mutateBenchmarkSealedChunk},
444+ {name: "cell-limited-293-columns", size: domain.Size{Cols: 293, Rows: 40}, historyRows: 10_000, cellLimited: true},
445+}
446+
447+func benchmarkIncrementalSnapshotRepository(b *testing.B, scenario snapshotBenchmarkScenario) {
448+ var (
449+ metrics countingSnapshotMetrics
450+ peakCacheBytes int
451+ )
452+ b.ReportAllocs()
453+ b.ResetTimer()
454+ for operation := 0; b.Loop(); operation++ {
455+ // A new fixture is deliberately outside the timed region. It gives every
456+ // iteration the same filesystem state: initial has no generation,
457+ // unchanged/visible/tail/sealed begin after one persisted generation.
458+ // Reusing one fixture would eventually turn a tail into a sealed chunk
459+ // and dilute initial-write bytes over later idempotent publications.
460+ b.StopTimer()
461+ fixture := newPerformanceFixture(b, performanceConfig{size: scenario.size, panes: 1, historyRows: scenario.historyRows})
462+ validateSnapshotBenchmarkFixture(b, fixture, scenario)
463+ generation := uint64(1)
464+ if scenario.baseline {
465+ publishBenchmarkSnapshot(b, fixture, generation)
466+ generation++
467+ fixture.snapshots.reset()
468+ }
469+ b.StartTimer()
470+ if scenario.mutate != nil {
471+ scenario.mutate(fixture, operation)
472+ }
473+ publishBenchmarkSnapshot(b, fixture, generation)
474+ b.StopTimer()
475+
476+ metrics = addCountingSnapshotMetrics(metrics, fixture.snapshots.metrics())
477+ peakCacheBytes = max(peakCacheBytes, benchmarkSnapshotCacheBytes(fixture.sess))
478+ // B.Loop requires the timer to be running at the next iteration.
479+ b.StartTimer()
480+ }
481+ b.StopTimer()
482+ if scenario.unchanged && metrics.historyBlobBytes != 0 {
483+ b.Fatalf("unchanged snapshot wrote %d history blob bytes", metrics.historyBlobBytes)
484+ }
485+ if peakCacheBytes > snapshotChunkCacheLimit {
486+ b.Fatalf("snapshot cache peak = %d, limit = %d", peakCacheBytes, snapshotChunkCacheLimit)
487+ }
488+ benchmarkReportSnapshotRepositoryMetrics(b, metrics, b.N, peakCacheBytes)
489+}
490+
491+func validateSnapshotBenchmarkFixture(b *testing.B, fixture *performanceFixture, scenario snapshotBenchmarkScenario) {
492+ b.Helper()
493+ if !fixture.hasHistoryTopology(1, 1, scenario.historyRows) && !scenario.cellLimited {
494+ b.Fatal("invalid incremental snapshot fixture")
495+ }
496+ if !scenario.cellLimited {
497+ return
498+ }
499+ fixture.activePane.mu.Lock()
500+ rows, cells, capCells := fixture.activePane.history.Len(), fixture.activePane.history.Cells(), fixture.activePane.history.CellCap()
501+ fixture.activePane.mu.Unlock()
502+ if rows >= scenario.historyRows || cells > capCells {
503+ b.Fatalf("293-column fixture did not enforce cell limit: rows=%d cells=%d cap=%d", rows, cells, capCells)
504+ }
505+}
506+
507+func addCountingSnapshotMetrics(a, b countingSnapshotMetrics) countingSnapshotMetrics {
508+ return countingSnapshotMetrics{
509+ writes: a.writes + b.writes,
510+ objectBytes: a.objectBytes + b.objectBytes,
511+ historyBlobBytes: a.historyBlobBytes + b.historyBlobBytes,
512+ manifestBytes: a.manifestBytes + b.manifestBytes,
513+ headBytes: a.headBytes + b.headBytes,
514+ }
515+}
516+
517+func publishBenchmarkSnapshot(b testing.TB, fixture *performanceFixture, generation uint64) {
518+ b.Helper()
519+ capture, ok := fixture.d.captureSnapshotState(fixture.sess, generation)
520+ if !ok {
521+ b.Fatal("snapshot capture unexpectedly rejected benchmark fixture")
522+ }
523+ publication, err := fixture.d.incrementalPublication(capture)
524+ if err != nil {
525+ b.Fatal(err)
526+ }
527+ if err := fixture.snapshots.Publish(context.Background(), publication); err != nil {
528+ b.Fatal(err)
529+ }
530+}
531+
532+func mutateBenchmarkVisible(fixture *performanceFixture, operation int) {
533+ fixture.activePane.mu.Lock()
534+ fixture.activePane.screen.Write([]byte(fmt.Sprintf("\x1b[1;1Hvisible-%08d", operation)))
535+ fixture.activePane.mu.Unlock()
536+}
537+
538+func mutateBenchmarkTail(fixture *performanceFixture, operation int) {
539+ fixture.activePane.mu.Lock()
540+ defer fixture.activePane.mu.Unlock()
541+ row := make([]renderer.Cell, fixture.activePane.screen.Frame.Width)
542+ for column := range row {
543+ row[column] = renderer.Cell{Rune: rune('a' + (operation+column)%26)}
544+ }
545+ if err := fixture.activePane.history.Append(row); err != nil {
546+ fixture.t.Fatal(err)
547+ }
548+}
549+
550+func mutateBenchmarkSealedChunk(fixture *performanceFixture, operation int) {
551+ for row := 0; row < 256; row++ {
552+ mutateBenchmarkTail(fixture, operation*256+row)
553+ }
554+}
555+
556+func benchmarkSnapshotCacheBytes(sess *session) int {
557+ sess.snapshotMu.Lock()
558+ defer sess.snapshotMu.Unlock()
559+ if sess.snapshotChunkCache == nil {
560+ return 0
561+ }
562+ return sess.snapshotChunkCache.used
563+}
564+
565+func benchmarkReportSnapshotRepositoryMetrics(b *testing.B, metrics countingSnapshotMetrics, operations int, peakCacheBytes int) {
566+ b.Helper()
567+ if operations == 0 {
568+ return
390569 }
570+ perOperation := float64(operations)
571+ b.ReportMetric(float64(metrics.objectBytes)/perOperation, "objectbytes/op")
572+ b.ReportMetric(float64(metrics.historyBlobBytes)/perOperation, "historyblobbytes/op")
573+ b.ReportMetric(float64(metrics.manifestBytes)/perOperation, "manifestbytes/op")
574+ b.ReportMetric(float64(metrics.headBytes)/perOperation, "headbytes/op")
575+ b.ReportMetric(float64(peakCacheBytes), "peakcachebytes")
391576 }
392577
393578 func benchmarkDaemonSnapshotRestore(b *testing.B) {
@@ -805,7 +990,7 @@ func (f *performanceFixture) configureTab(tb *tab, tabIndex, paneCount, historyR
805990 for _, p := range tb.panes {
806991 p.mu.Lock()
807992 width := p.screen.Frame.Width
808- for row := 0; p.history.Len() < historyRows; row++ {
993+ for row := 0; p.history.Len() < historyRows && row < historyRows+p.screen.Frame.Height; row++ {
809994 p.screen.Write([]byte(performanceFullWidthRow(width, tabIndex, row) + "\r\n"))
810995 }
811996 p.mu.Unlock()
@@ -1037,24 +1222,50 @@ func (t *countingOutputTransport) lastPayload() []byte {
10371222 return t.last
10381223 }
10391224
1225+// snapshotHeadBytes is the on-disk VEVH header (magic, generation, and
1226+// manifest digest) written by the filesystem repository for every generation.
1227+const snapshotHeadBytes = 4 + 8 + 32
1228+
10401229 type countingSnapshotMetrics struct {
1041- writes, manifestBytes, objectBytes uint64
1230+ writes, objectBytes, historyBlobBytes, manifestBytes, headBytes uint64
10421231 }
10431232 type countingSnapshotRepository struct {
10441233 mu sync.Mutex
10451234 countingSnapshotMetrics
1046- last []byte
1235+ objects map[string]map[ports.SnapshotDigest]struct{}
1236+ last []byte
10471237 }
10481238
1239+// Publish models the bytes written by the filesystem repository: immutable
1240+// VEVO objects are written once per session and each generation writes a VEVM
1241+// manifest plus the mutable VEVH pointer. It intentionally does not measure
1242+// directory metadata, temporary files, or fsyncs.
10491243 func (s *countingSnapshotRepository) Publish(_ context.Context, publication ports.SnapshotPublication) error {
10501244 s.mu.Lock()
1245+ defer s.mu.Unlock()
1246+ if s.objects == nil {
1247+ s.objects = make(map[string]map[ports.SnapshotDigest]struct{})
1248+ }
1249+ objects := s.objects[publication.Name]
1250+ if objects == nil {
1251+ objects = make(map[ports.SnapshotDigest]struct{})
1252+ s.objects[publication.Name] = objects
1253+ }
10511254 s.writes++
10521255 s.manifestBytes += uint64(len(publication.Manifest))
1256+ s.headBytes += snapshotHeadBytes
10531257 for _, object := range publication.Objects {
1258+ if _, exists := objects[object.Digest]; exists {
1259+ continue
1260+ }
1261+ objects[object.Digest] = struct{}{}
10541262 s.objectBytes += uint64(len(object.Data))
1263+ kind, _, err := snapcodec.PreflightObject(object.Data)
1264+ if err == nil && kind == snapcodec.HistoryChunk {
1265+ s.historyBlobBytes += uint64(len(object.Data))
1266+ }
10551267 }
10561268 s.last = publication.Manifest
1057- s.mu.Unlock()
10581269 return nil
10591270 }
10601271 func (*countingSnapshotRepository) List(context.Context) ([]string, error) { return nil, nil }
@@ -14,6 +14,7 @@ import (
14 "github.com/bnema/vev/internal/ports"14 "github.com/bnema/vev/internal/ports"
15 "github.com/bnema/vev/internal/usecase/layout"15 "github.com/bnema/vev/internal/usecase/layout"
16 snapcodec "github.com/bnema/vev/internal/usecase/snapshot"16 snapcodec "github.com/bnema/vev/internal/usecase/snapshot"
17+ "github.com/bnema/vev/pkg/renderer"
17 )18 )
18 19
19 func TestCountingSnapshotRepositoryPublishCountsAndRetainsManifest(t *testing.T) {20 func TestCountingSnapshotRepositoryPublishCountsAndRetainsManifest(t *testing.T) {
@@ -22,13 +23,78 @@ func TestCountingSnapshotRepositoryPublishCountsAndRetainsManifest(t *testing.T)
22 object := []byte{0x01, 0x02}23 object := []byte{0x01, 0x02}
23 24
24 require.NoError(t, repository.Publish(context.Background(), ports.SnapshotPublication{Name: "session", Manifest: payload, Objects: []ports.SnapshotObject{{Data: object}}}))25 require.NoError(t, repository.Publish(context.Background(), ports.SnapshotPublication{Name: "session", Manifest: payload, Objects: []ports.SnapshotObject{{Data: object}}}))
25- require.Equal(t, countingSnapshotMetrics{writes: 1, manifestBytes: uint64(len(payload)), objectBytes: uint64(len(object))}, repository.metrics())26+ require.Equal(t, countingSnapshotMetrics{writes: 1, manifestBytes: uint64(len(payload)), objectBytes: uint64(len(object)), headBytes: snapshotHeadBytes}, repository.metrics())
26 require.Equal(t, payload, repository.lastPayload())27 require.Equal(t, payload, repository.lastPayload())
27 28
28 payload[0] = 0x0129 payload[0] = 0x01
29 require.Equal(t, payload, repository.lastPayload(), "the counting sink must retain the payload slice header, not copy it")30 require.Equal(t, payload, repository.lastPayload(), "the counting sink must retain the payload slice header, not copy it")
30 }31 }
31 32
33+func TestCountingSnapshotRepositoryDoesNotRewriteKnownObjects(t *testing.T) {
34+ repository := &countingSnapshotRepository{}
35+ object, err := snapcodec.MarshalObject(snapcodec.HistoryChunk, []byte{0x01})
36+ require.NoError(t, err)
37+ publication := ports.SnapshotPublication{Name: "session", Manifest: []byte("manifest"), Objects: []ports.SnapshotObject{object}}
38+
39+ require.NoError(t, repository.Publish(context.Background(), publication))
40+ repository.reset()
41+ require.NoError(t, repository.Publish(context.Background(), publication))
42+
43+ require.Zero(t, repository.metrics().objectBytes, "filesystem repositories retain immutable content-addressed objects")
44+}
45+
46+func TestIncrementalSnapshotMetricsWriteNoUnchangedHistoryBlobsAndBoundCache(t *testing.T) {
47+ fixture := newPerformanceFixture(t, performanceConfig{size: domain.Size{Cols: 120, Rows: 40}, panes: 1, historyRows: 10_000})
48+
49+ publishBenchmarkSnapshot(t, fixture, 1)
50+ fixture.snapshots.reset()
51+ publishBenchmarkSnapshot(t, fixture, 2)
52+
53+ metrics := fixture.snapshots.metrics()
54+ require.Zero(t, metrics.historyBlobBytes)
55+ require.Zero(t, metrics.objectBytes)
56+ require.Positive(t, metrics.manifestBytes)
57+ require.Equal(t, uint64(snapshotHeadBytes), metrics.headBytes)
58+ require.LessOrEqual(t, benchmarkSnapshotCacheBytes(fixture.sess), snapshotChunkCacheLimit)
59+}
60+
61+func TestIncrementalSnapshotMetricScenarios(t *testing.T) {
62+ for _, tt := range []struct {
63+ name string
64+ historyRows int
65+ mutate func(*performanceFixture, int)
66+ wantHistory bool
67+ }{
68+ {name: "tail-only", historyRows: 9_999, mutate: mutateBenchmarkTail},
69+ {name: "new-sealed-chunk", historyRows: 10_000, mutate: mutateBenchmarkSealedChunk, wantHistory: true},
70+ } {
71+ t.Run(tt.name, func(t *testing.T) {
72+ fixture := newPerformanceFixture(t, performanceConfig{size: domain.Size{Cols: 120, Rows: 40}, panes: 1, historyRows: tt.historyRows})
73+ publishBenchmarkSnapshot(t, fixture, 1)
74+ fixture.snapshots.reset()
75+ tt.mutate(fixture, 0)
76+ publishBenchmarkSnapshot(t, fixture, 2)
77+
78+ metrics := fixture.snapshots.metrics()
79+ if tt.wantHistory {
80+ require.Positive(t, metrics.historyBlobBytes)
81+ } else {
82+ require.Zero(t, metrics.historyBlobBytes)
83+ }
84+ require.LessOrEqual(t, benchmarkSnapshotCacheBytes(fixture.sess), snapshotChunkCacheLimit)
85+ })
86+ }
87+}
88+
89+func TestPerformanceFixtureCellLimitedHistory(t *testing.T) {
90+ fixture := newPerformanceFixture(t, performanceConfig{size: domain.Size{Cols: 293, Rows: 40}, panes: 1, historyRows: 10_000})
91+ fixture.activePane.mu.Lock()
92+ rows, cells, capCells := fixture.activePane.history.Len(), fixture.activePane.history.Cells(), fixture.activePane.history.CellCap()
93+ fixture.activePane.mu.Unlock()
94+ require.Less(t, rows, 10_000)
95+ require.LessOrEqual(t, cells, capCells)
96+}
97+
32 func TestCountingOutputTransportCountsOpaquePayloadAndRejectsShortPayload(t *testing.T) {98 func TestCountingOutputTransportCountsOpaquePayloadAndRejectsShortPayload(t *testing.T) {
33 transport := &countingOutputTransport{}99 transport := &countingOutputTransport{}
34 100
@@ -219,10 +285,16 @@ func BenchmarkDaemonHistorySnapshotCapture(b *testing.B) {
219 benchmarkDaemonSnapshotCapture(b)285 benchmarkDaemonSnapshotCapture(b)
220 }286 }
221 287
222-// BenchmarkDaemonHistorySnapshotEncode measures incremental publication from an288+// BenchmarkDaemonIncrementalSnapshotRepository measures the complete
223-// already immutable capture, without queueing or persistence.289+// content-addressed publication path against a filesystem-equivalent byte
224-func BenchmarkDaemonHistorySnapshotEncode(b *testing.B) {290+// counter. Each scenario reports persisted VEVO, VEVM, and VEVH bytes, plus
225- benchmarkDaemonSnapshotEncode(b)291+// allocation/time and the per-session encoded-history cache high-water mark.
292+func BenchmarkDaemonIncrementalSnapshotRepository(b *testing.B) {
293+ for _, scenario := range snapshotBenchmarkScenarios {
294+ b.Run(scenario.name, func(b *testing.B) {
295+ benchmarkIncrementalSnapshotRepository(b, scenario)
296+ })
297+ }
226 }298 }
227 299
228 // BenchmarkDaemonHistorySnapshotRestore measures terminal-state restoration300 // BenchmarkDaemonHistorySnapshotRestore measures terminal-state restoration
@@ -351,43 +423,156 @@ func benchmarkDaemonSnapshotCapture(b *testing.B) {
351 }423 }
352 }424 }
353 425
354-func benchmarkDaemonSnapshotEncode(b *testing.B) {426+type snapshotBenchmarkScenario struct {
355- for _, topology := range daemonSnapshotTopologies {427+ name string
356- b.Run(topology.name, func(b *testing.B) {428+ size domain.Size
357- fixture := newPerformanceFixture(b, performanceConfig{size: domain.Size{Cols: 120, Rows: 40}, tabs: topology.tabs, panes: topology.panes, historyRows: 10_000})429+ historyRows int
358- if !fixture.hasHistoryTopology(topology.tabs, topology.panes, 10_000) {430+ baseline bool
359- b.Fatal("invalid daemon snapshot publication fixture")431+ mutate func(*performanceFixture, int)
360- }432+ unchanged bool
361- capture, ok := fixture.d.captureSnapshotState(fixture.sess, 1)433+ cellLimited bool
362- if !ok || !validBenchmarkCapture(capture) {434+}
363- b.Fatal("invalid snapshot publication fixture")435+
364- }436+var snapshotBenchmarkScenarios = []snapshotBenchmarkScenario{
365- publication, err := fixture.d.incrementalPublication(capture)437+ {name: "initial-10k-x-120", size: domain.Size{Cols: 120, Rows: 40}, historyRows: 10_000},
366- if err != nil {438+ {name: "unchanged", size: domain.Size{Cols: 120, Rows: 40}, historyRows: 10_000, baseline: true, unchanged: true},
367- b.Fatal(err)439+ {name: "visible-only", size: domain.Size{Cols: 120, Rows: 40}, historyRows: 10_000, baseline: true, mutate: mutateBenchmarkVisible},
368- }440+ // Leave one row below the retention cap so the mutation changes only the
369- if _, err := snapcodec.UnmarshalManifest(publication.Manifest); err != nil || len(publication.Objects) == 0 {441+ // mutable tail and cannot evict a sealed chunk.
370- b.Fatalf("invalid incremental snapshot publication fixture: %v", err)442+ {name: "tail-only", size: domain.Size{Cols: 120, Rows: 40}, historyRows: 9_999, baseline: true, mutate: mutateBenchmarkTail},
371- }443+ {name: "new-sealed-chunk", size: domain.Size{Cols: 120, Rows: 40}, historyRows: 10_000, baseline: true, mutate: mutateBenchmarkSealedChunk},
372- var last ports.SnapshotPublication444+ {name: "cell-limited-293-columns", size: domain.Size{Cols: 293, Rows: 40}, historyRows: 10_000, cellLimited: true},
373- b.ReportAllocs()445+}
374- b.SetBytes(int64(snapshotPublicationBytes(publication)))446+
375- b.ResetTimer()447+func benchmarkIncrementalSnapshotRepository(b *testing.B, scenario snapshotBenchmarkScenario) {
376- for range b.N {448+ var (
377- last, err = fixture.d.incrementalPublication(capture)449+ metrics countingSnapshotMetrics
378- if err != nil {450+ peakCacheBytes int
379- b.Fatal(err)451+ )
380- }452+ b.ReportAllocs()
381- }453+ b.ResetTimer()
382- b.StopTimer()454+ for operation := 0; b.Loop(); operation++ {
383- if _, err := snapcodec.UnmarshalManifest(last.Manifest); err != nil {455+ // A new fixture is deliberately outside the timed region. It gives every
384- b.Fatalf("snapshot publication produced invalid manifest: %v", err)456+ // iteration the same filesystem state: initial has no generation,
385- }457+ // unchanged/visible/tail/sealed begin after one persisted generation.
386- b.ReportMetric(float64(len(last.Manifest)), "manifestbytes/op")458+ // Reusing one fixture would eventually turn a tail into a sealed chunk
387- b.ReportMetric(float64(snapshotObjectBytes(last)), "objectbytes/op")459+ // and dilute initial-write bytes over later idempotent publications.
388- b.ReportMetric(float64(len(last.Objects)), "objects/op")460+ b.StopTimer()
389- })461+ fixture := newPerformanceFixture(b, performanceConfig{size: scenario.size, panes: 1, historyRows: scenario.historyRows})
462+ validateSnapshotBenchmarkFixture(b, fixture, scenario)
463+ generation := uint64(1)
464+ if scenario.baseline {
465+ publishBenchmarkSnapshot(b, fixture, generation)
466+ generation++
467+ fixture.snapshots.reset()
468+ }
469+ b.StartTimer()
470+ if scenario.mutate != nil {
471+ scenario.mutate(fixture, operation)
472+ }
473+ publishBenchmarkSnapshot(b, fixture, generation)
474+ b.StopTimer()
475+
476+ metrics = addCountingSnapshotMetrics(metrics, fixture.snapshots.metrics())
477+ peakCacheBytes = max(peakCacheBytes, benchmarkSnapshotCacheBytes(fixture.sess))
478+ // B.Loop requires the timer to be running at the next iteration.
479+ b.StartTimer()
480+ }
481+ b.StopTimer()
482+ if scenario.unchanged && metrics.historyBlobBytes != 0 {
483+ b.Fatalf("unchanged snapshot wrote %d history blob bytes", metrics.historyBlobBytes)
484+ }
485+ if peakCacheBytes > snapshotChunkCacheLimit {
486+ b.Fatalf("snapshot cache peak = %d, limit = %d", peakCacheBytes, snapshotChunkCacheLimit)
487+ }
488+ benchmarkReportSnapshotRepositoryMetrics(b, metrics, b.N, peakCacheBytes)
489+}
490+
491+func validateSnapshotBenchmarkFixture(b *testing.B, fixture *performanceFixture, scenario snapshotBenchmarkScenario) {
492+ b.Helper()
493+ if !fixture.hasHistoryTopology(1, 1, scenario.historyRows) && !scenario.cellLimited {
494+ b.Fatal("invalid incremental snapshot fixture")
495+ }
496+ if !scenario.cellLimited {
497+ return
498+ }
499+ fixture.activePane.mu.Lock()
500+ rows, cells, capCells := fixture.activePane.history.Len(), fixture.activePane.history.Cells(), fixture.activePane.history.CellCap()
501+ fixture.activePane.mu.Unlock()
502+ if rows >= scenario.historyRows || cells > capCells {
503+ b.Fatalf("293-column fixture did not enforce cell limit: rows=%d cells=%d cap=%d", rows, cells, capCells)
504+ }
505+}
506+
507+func addCountingSnapshotMetrics(a, b countingSnapshotMetrics) countingSnapshotMetrics {
508+ return countingSnapshotMetrics{
509+ writes: a.writes + b.writes,
510+ objectBytes: a.objectBytes + b.objectBytes,
511+ historyBlobBytes: a.historyBlobBytes + b.historyBlobBytes,
512+ manifestBytes: a.manifestBytes + b.manifestBytes,
513+ headBytes: a.headBytes + b.headBytes,
514+ }
515+}
516+
517+func publishBenchmarkSnapshot(b testing.TB, fixture *performanceFixture, generation uint64) {
518+ b.Helper()
519+ capture, ok := fixture.d.captureSnapshotState(fixture.sess, generation)
520+ if !ok {
521+ b.Fatal("snapshot capture unexpectedly rejected benchmark fixture")
522+ }
523+ publication, err := fixture.d.incrementalPublication(capture)
524+ if err != nil {
525+ b.Fatal(err)
526+ }
527+ if err := fixture.snapshots.Publish(context.Background(), publication); err != nil {
528+ b.Fatal(err)
529+ }
530+}
531+
532+func mutateBenchmarkVisible(fixture *performanceFixture, operation int) {
533+ fixture.activePane.mu.Lock()
534+ fixture.activePane.screen.Write([]byte(fmt.Sprintf("\x1b[1;1Hvisible-%08d", operation)))
535+ fixture.activePane.mu.Unlock()
536+}
537+
538+func mutateBenchmarkTail(fixture *performanceFixture, operation int) {
539+ fixture.activePane.mu.Lock()
540+ defer fixture.activePane.mu.Unlock()
541+ row := make([]renderer.Cell, fixture.activePane.screen.Frame.Width)
542+ for column := range row {
543+ row[column] = renderer.Cell{Rune: rune('a' + (operation+column)%26)}
544+ }
545+ if err := fixture.activePane.history.Append(row); err != nil {
546+ fixture.t.Fatal(err)
547+ }
548+}
549+
550+func mutateBenchmarkSealedChunk(fixture *performanceFixture, operation int) {
551+ for row := 0; row < 256; row++ {
552+ mutateBenchmarkTail(fixture, operation*256+row)
553+ }
554+}
555+
556+func benchmarkSnapshotCacheBytes(sess *session) int {
557+ sess.snapshotMu.Lock()
558+ defer sess.snapshotMu.Unlock()
559+ if sess.snapshotChunkCache == nil {
560+ return 0
561+ }
562+ return sess.snapshotChunkCache.used
563+}
564+
565+func benchmarkReportSnapshotRepositoryMetrics(b *testing.B, metrics countingSnapshotMetrics, operations int, peakCacheBytes int) {
566+ b.Helper()
567+ if operations == 0 {
568+ return
390 }569 }
570+ perOperation := float64(operations)
571+ b.ReportMetric(float64(metrics.objectBytes)/perOperation, "objectbytes/op")
572+ b.ReportMetric(float64(metrics.historyBlobBytes)/perOperation, "historyblobbytes/op")
573+ b.ReportMetric(float64(metrics.manifestBytes)/perOperation, "manifestbytes/op")
574+ b.ReportMetric(float64(metrics.headBytes)/perOperation, "headbytes/op")
575+ b.ReportMetric(float64(peakCacheBytes), "peakcachebytes")
391 }576 }
392 577
393 func benchmarkDaemonSnapshotRestore(b *testing.B) {578 func benchmarkDaemonSnapshotRestore(b *testing.B) {
@@ -805,7 +990,7 @@ func (f *performanceFixture) configureTab(tb *tab, tabIndex, paneCount, historyR
805 for _, p := range tb.panes {990 for _, p := range tb.panes {
806 p.mu.Lock()991 p.mu.Lock()
807 width := p.screen.Frame.Width992 width := p.screen.Frame.Width
808- for row := 0; p.history.Len() < historyRows; row++ {993+ for row := 0; p.history.Len() < historyRows && row < historyRows+p.screen.Frame.Height; row++ {
809 p.screen.Write([]byte(performanceFullWidthRow(width, tabIndex, row) + "\r\n"))994 p.screen.Write([]byte(performanceFullWidthRow(width, tabIndex, row) + "\r\n"))
810 }995 }
811 p.mu.Unlock()996 p.mu.Unlock()
@@ -1037,24 +1222,50 @@ func (t *countingOutputTransport) lastPayload() []byte {
1037 return t.last1222 return t.last
1038 }1223 }
1039 1224
1225+// snapshotHeadBytes is the on-disk VEVH header (magic, generation, and
1226+// manifest digest) written by the filesystem repository for every generation.
1227+const snapshotHeadBytes = 4 + 8 + 32
1228+
1040 type countingSnapshotMetrics struct {1229 type countingSnapshotMetrics struct {
1041- writes, manifestBytes, objectBytes uint641230+ writes, objectBytes, historyBlobBytes, manifestBytes, headBytes uint64
1042 }1231 }
1043 type countingSnapshotRepository struct {1232 type countingSnapshotRepository struct {
1044 mu sync.Mutex1233 mu sync.Mutex
1045 countingSnapshotMetrics1234 countingSnapshotMetrics
1046- last []byte1235+ objects map[string]map[ports.SnapshotDigest]struct{}
1236+ last []byte
1047 }1237 }
1048 1238
1239+// Publish models the bytes written by the filesystem repository: immutable
1240+// VEVO objects are written once per session and each generation writes a VEVM
1241+// manifest plus the mutable VEVH pointer. It intentionally does not measure
1242+// directory metadata, temporary files, or fsyncs.
1049 func (s *countingSnapshotRepository) Publish(_ context.Context, publication ports.SnapshotPublication) error {1243 func (s *countingSnapshotRepository) Publish(_ context.Context, publication ports.SnapshotPublication) error {
1050 s.mu.Lock()1244 s.mu.Lock()
1245+ defer s.mu.Unlock()
1246+ if s.objects == nil {
1247+ s.objects = make(map[string]map[ports.SnapshotDigest]struct{})
1248+ }
1249+ objects := s.objects[publication.Name]
1250+ if objects == nil {
1251+ objects = make(map[ports.SnapshotDigest]struct{})
1252+ s.objects[publication.Name] = objects
1253+ }
1051 s.writes++1254 s.writes++
1052 s.manifestBytes += uint64(len(publication.Manifest))1255 s.manifestBytes += uint64(len(publication.Manifest))
1256+ s.headBytes += snapshotHeadBytes
1053 for _, object := range publication.Objects {1257 for _, object := range publication.Objects {
1258+ if _, exists := objects[object.Digest]; exists {
1259+ continue
1260+ }
1261+ objects[object.Digest] = struct{}{}
1054 s.objectBytes += uint64(len(object.Data))1262 s.objectBytes += uint64(len(object.Data))
1263+ kind, _, err := snapcodec.PreflightObject(object.Data)
1264+ if err == nil && kind == snapcodec.HistoryChunk {
1265+ s.historyBlobBytes += uint64(len(object.Data))
1266+ }
1055 }1267 }
1056 s.last = publication.Manifest1268 s.last = publication.Manifest
1057- s.mu.Unlock()
1058 return nil1269 return nil
1059 }1270 }
1060 func (*countingSnapshotRepository) List(context.Context) ([]string, error) { return nil, nil }1271 func (*countingSnapshotRepository) List(context.Context) ([]string, error) { return nil, nil }
D internal/usecase/snapshot/benchmark_test.go +0 -124
@@ -1,124 +0,0 @@
1-package snapshot
2-
3-import (
4- "testing"
5-
6- "github.com/bnema/vev/internal/usecase/layout"
7- "github.com/bnema/vev/pkg/renderer"
8- "github.com/bnema/vev/pkg/vt"
9-)
10-
11-var (
12- benchmarkV3BytesSink []byte
13- benchmarkV3SessionSink Session
14-)
15-
16-func BenchmarkSnapshotV3Marshal10KRows(b *testing.B) {
17- session, encoded := benchmarkV3Session(b)
18- b.ReportAllocs()
19- b.SetBytes(int64(len(encoded)))
20- b.ResetTimer()
21- for b.Loop() {
22- var err error
23- benchmarkV3BytesSink, err = Marshal(session)
24- if err != nil {
25- b.Fatal(err)
26- }
27- }
28- b.StopTimer()
29- if _, err := Unmarshal(benchmarkV3BytesSink); err != nil {
30- b.Fatalf("marshal produced an invalid v3 snapshot: %v", err)
31- }
32-}
33-
34-func BenchmarkSnapshotV3Unmarshal10KRows(b *testing.B) {
35- _, encoded := benchmarkV3Session(b)
36- b.ReportAllocs()
37- b.SetBytes(int64(len(encoded)))
38- b.ResetTimer()
39- for b.Loop() {
40- var err error
41- benchmarkV3SessionSink, err = Unmarshal(encoded)
42- if err != nil {
43- b.Fatal(err)
44- }
45- }
46- b.StopTimer()
47- if len(benchmarkV3SessionSink.Tabs) != 1 || len(benchmarkV3SessionSink.Tabs[0].Panes) != 1 || len(benchmarkV3SessionSink.Tabs[0].Panes[0].SealedChunks) != 40 {
48- b.Fatal("unmarshal lost canonical 10k-row snapshot data")
49- }
50-}
51-
52-func benchmarkV3Session(t testing.TB) (Session, []byte) {
53- t.Helper()
54- const (
55- cols = 120
56- rows = 40
57- historyRows = 10_000
58- chunkRows = 256
59- )
60- history := vt.NewHistory(vt.HistoryConfig{MaxRows: historyRows, ChunkRows: chunkRows})
61- for row := range historyRows {
62- cells := make([]renderer.Cell, cols)
63- for col := range cells {
64- cells[col] = renderer.Cell{Rune: rune('a' + (row+col)%26)}
65- }
66- if err := history.Append(cells); err != nil {
67- t.Fatal(err)
68- }
69- }
70- sealed, tail, err := vt.MarshalSealedHistory(history.SealAndView())
71- if err != nil {
72- t.Fatal(err)
73- }
74- visibleFrame := renderer.NewFrame(cols, rows)
75- for y := range rows {
76- for x := range cols {
77- visibleFrame.Set(x, y, renderer.Cell{Rune: rune('A' + (x+y)%26)})
78- }
79- }
80- visible, err := vt.MarshalVisible(visibleFrame)
81- if err != nil {
82- t.Fatal(err)
83- }
84- session := Session{
85- Name: "benchmark",
86- CreatedAt: 1,
87- Tabs: []Tab{{
88- StableID: "tab-1",
89- Cols: cols,
90- Rows: rows,
91- NextPaneID: 2,
92- Focus: "pane-1",
93- Tree: layout.NewTree("pane-1"),
94- Panes: []Pane{{
95- ID: "pane-1",
96- StableID: "pane-1",
97- Cwd: "/benchmark",
98- SealedChunks: sealed,
99- Tail: tail,
100- Visible: visible,
101- }},
102- }},
103- }
104- encoded, err := Marshal(session)
105- if err != nil {
106- t.Fatal(err)
107- }
108- decoded, err := Unmarshal(encoded)
109- if err != nil {
110- t.Fatal(err)
111- }
112- paneCount := 0
113- decodedChunks := 0
114- if len(decoded.Tabs) == 1 {
115- paneCount = len(decoded.Tabs[0].Panes)
116- if paneCount == 1 {
117- decodedChunks = len(decoded.Tabs[0].Panes[0].SealedChunks)
118- }
119- }
120- if len(sealed) != (historyRows+chunkRows-1)/chunkRows || paneCount != 1 || decodedChunks != len(sealed) {
121- t.Fatalf("invalid v3 benchmark fixture: chunks=%d tabs=%d panes=%d decoded chunks=%d", len(sealed), len(decoded.Tabs), paneCount, decodedChunks)
122- }
123- return session, encoded
124-}
@@ -1,124 +0,0 @@
1-package snapshot
2-
3-import (
4- "testing"
5-
6- "github.com/bnema/vev/internal/usecase/layout"
7- "github.com/bnema/vev/pkg/renderer"
8- "github.com/bnema/vev/pkg/vt"
9-)
10-
11-var (
12- benchmarkV3BytesSink []byte
13- benchmarkV3SessionSink Session
14-)
15-
16-func BenchmarkSnapshotV3Marshal10KRows(b *testing.B) {
17- session, encoded := benchmarkV3Session(b)
18- b.ReportAllocs()
19- b.SetBytes(int64(len(encoded)))
20- b.ResetTimer()
21- for b.Loop() {
22- var err error
23- benchmarkV3BytesSink, err = Marshal(session)
24- if err != nil {
25- b.Fatal(err)
26- }
27- }
28- b.StopTimer()
29- if _, err := Unmarshal(benchmarkV3BytesSink); err != nil {
30- b.Fatalf("marshal produced an invalid v3 snapshot: %v", err)
31- }
32-}
33-
34-func BenchmarkSnapshotV3Unmarshal10KRows(b *testing.B) {
35- _, encoded := benchmarkV3Session(b)
36- b.ReportAllocs()
37- b.SetBytes(int64(len(encoded)))
38- b.ResetTimer()
39- for b.Loop() {
40- var err error
41- benchmarkV3SessionSink, err = Unmarshal(encoded)
42- if err != nil {
43- b.Fatal(err)
44- }
45- }
46- b.StopTimer()
47- if len(benchmarkV3SessionSink.Tabs) != 1 || len(benchmarkV3SessionSink.Tabs[0].Panes) != 1 || len(benchmarkV3SessionSink.Tabs[0].Panes[0].SealedChunks) != 40 {
48- b.Fatal("unmarshal lost canonical 10k-row snapshot data")
49- }
50-}
51-
52-func benchmarkV3Session(t testing.TB) (Session, []byte) {
53- t.Helper()
54- const (
55- cols = 120
56- rows = 40
57- historyRows = 10_000
58- chunkRows = 256
59- )
60- history := vt.NewHistory(vt.HistoryConfig{MaxRows: historyRows, ChunkRows: chunkRows})
61- for row := range historyRows {
62- cells := make([]renderer.Cell, cols)
63- for col := range cells {
64- cells[col] = renderer.Cell{Rune: rune('a' + (row+col)%26)}
65- }
66- if err := history.Append(cells); err != nil {
67- t.Fatal(err)
68- }
69- }
70- sealed, tail, err := vt.MarshalSealedHistory(history.SealAndView())
71- if err != nil {
72- t.Fatal(err)
73- }
74- visibleFrame := renderer.NewFrame(cols, rows)
75- for y := range rows {
76- for x := range cols {
77- visibleFrame.Set(x, y, renderer.Cell{Rune: rune('A' + (x+y)%26)})
78- }
79- }
80- visible, err := vt.MarshalVisible(visibleFrame)
81- if err != nil {
82- t.Fatal(err)
83- }
84- session := Session{
85- Name: "benchmark",
86- CreatedAt: 1,
87- Tabs: []Tab{{
88- StableID: "tab-1",
89- Cols: cols,
90- Rows: rows,
91- NextPaneID: 2,
92- Focus: "pane-1",
93- Tree: layout.NewTree("pane-1"),
94- Panes: []Pane{{
95- ID: "pane-1",
96- StableID: "pane-1",
97- Cwd: "/benchmark",
98- SealedChunks: sealed,
99- Tail: tail,
100- Visible: visible,
101- }},
102- }},
103- }
104- encoded, err := Marshal(session)
105- if err != nil {
106- t.Fatal(err)
107- }
108- decoded, err := Unmarshal(encoded)
109- if err != nil {
110- t.Fatal(err)
111- }
112- paneCount := 0
113- decodedChunks := 0
114- if len(decoded.Tabs) == 1 {
115- paneCount = len(decoded.Tabs[0].Panes)
116- if paneCount == 1 {
117- decodedChunks = len(decoded.Tabs[0].Panes[0].SealedChunks)
118- }
119- }
120- if len(sealed) != (historyRows+chunkRows-1)/chunkRows || paneCount != 1 || decodedChunks != len(sealed) {
121- t.Fatalf("invalid v3 benchmark fixture: chunks=%d tabs=%d panes=%d decoded chunks=%d", len(sealed), len(decoded.Tabs), paneCount, decodedChunks)
122- }
123- return session, encoded
124-}

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