perf: measure historical directory token churn - #50
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📝 SummarySummary by CodeRabbit
WalkthroughThis change adds a directory-token benchmark runner, fixture calibration tests, reproduction and interpretation documentation, and a report of retained measurements. The test script is included in linting and runs through ChangesDirectory-token benchmark
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Other Sequence Diagram(s)sequenceDiagram
participant BenchmarkScript as benchmark-directory-tokens.sh
participant GitLocks as git-locks CLI
participant GitStore
participant NativeTime
participant Results
BenchmarkScript->>GitStore: create and inventory fixture
BenchmarkScript->>NativeTime: measure CLI operation
NativeTime->>GitLocks: run check, claim, list, or doctor
GitLocks->>GitStore: read or update refs
NativeTime->>Results: record elapsed time, RSS, exit status, and output count
BenchmarkScript->>Results: write fixture metadata and timing summaries
Merge Risk: 🔵 Low · up to The local suite includes the new calibration, but the Docker suite does not. Add it and its timing dependency to restore consistent test coverage; this is a bounded merge risk. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 2 files. (7 skipped: 7 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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An inherited GIT_LOCKS_TRACE added file I/O to every measured command, and an inherited GIT_LOCKS_PAUSE_* gate would hang the matrix. The runner and the calibration test now unset the hook variables and GIT_LOCKS_HOME. The test also points TMPDIR at its own directory so a failed quick run's retained scratch store is cleaned up with the rest. Refs #39
…E note to Limits The PR description records that the 2026-09-22 timing run coincided with extreme host RAM and disk exhaustion, but the committed report, protocol and CHANGELOG presented its latencies as findings and placed that pressure only before the matrix started. Carry the status into the docs, correct the reuse object count (9,999 of 10,000 loose records are unreachable), and move the benchmark pointer out of the License section into Limits, stated. Refs #39
…churn # Conflicts: # CHANGELOG.md # Makefile
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Review comments at @Makefile:
- Line 21: Update the test-docker recipe to install GNU time in the Alpine
container and run test/directory-token-churn.sh as part of its calibration
sequence.
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docs/benchmarks/results/2026-09-22/fixtures.csvis excluded by!**/*.csvdocs/benchmarks/results/2026-09-22/observations.csvis excluded by!**/*.csvdocs/benchmarks/results/2026-09-22/summary.csvis excluded by!**/*.csv
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CHANGELOG.mdMakefileREADME.mddocs/benchmarks/directory-tokens-results.mddocs/benchmarks/directory-tokens.mddocs/benchmarks/results/2026-09-22/environment.txtdocs/benchmarks/results/2026-09-22/hardware.txtdocs/benchmarks/results/2026-09-22/native-time.txtscripts/benchmark-directory-tokens.shtest/directory-token-churn.sh
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docs/benchmarks/directory-tokens-results.md
[style] ~3-~3: The double modal “needs recorded” is nonstandard (only accepted in certain dialects). Consider “to be recorded”.
Context: ...entative performance. A fresh run needs recorded host preflight and monitoring during me...
(NEEDS_FIXED)
[grammar] ~44-~44: Use a hyphen to join words.
Context: ...he variation, including the 6.811-second wide 10k check outlier. These results...
(QB_NEW_EN_HYPHEN)
🔇 Additional comments (7)
test/directory-token-churn.sh (1)
1-152: LGTM!docs/benchmarks/directory-tokens.md (1)
1-41: LGTM!docs/benchmarks/directory-tokens-results.md (1)
1-48: LGTM!docs/benchmarks/results/2026-09-22/environment.txt (1)
1-12: LGTM!docs/benchmarks/results/2026-09-22/hardware.txt (1)
1-6: LGTM!README.md (1)
464-464: LGTM!CHANGELOG.md (1)
9-9: LGTM!
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Measurement status: resource-confounded initial run; fresh baseline pending. The workstation owner reported that the original timing run coincided with extreme RAM and disk exhaustion. Preserve the raw observations as a record of that run, but do not treat the latency values or ratios below as representative performance. The earlier report did not record concurrent system memory-pressure/swap telemetry, so the resource contribution cannot be quantified retrospectively. A fresh run will require recorded host preflight and monitoring during measurement.
A released store with 10,000 wide directory tokens and 10,000 reachable records measured a median
checklatency of 3.641 seconds, with zero job or path refs. Empty-store controls measured 0.140 seconds before and 0.094 seconds after the matrix. This PR retains a calibrated generator, an informational runner, raw observations, and a bounded report so historical directory state can be measured alongside live-lock count.The study contains 135 native macOS observations: nine scenarios, five operations, and three repetitions. Every measured command exited 0, expected output counts matched, and every post-operation ref fingerprint matched its initial state. Wide/deep/reuse workloads distinguish retained refs, distinct reachable records, and unreachable historical objects; a synthetic live 1k control provides a separate comparison.
Validation: observed RED before implementing fixture creation, missing-store refusal, and the quick timing matrix. Small wide/deep/reuse fixtures match actual CLI claim/release records and refs except for acquisition IDs. Independent counts, deliberate contamination, invalid inputs, existing-store preservation, 12 seed-39 shape samples, and all 25 quick-matrix observations pass. The normal pre-push main suite passes 452 tests, 0 failures, followed by the benchmark calibration; lint passes.
The measured code is frozen at
fe7cdb5;e28f480adds only results and documentation. Native macOS metadata and exact binary/generator blob IDs are retained. Setup and cleanup were excluded from timing. Caches were not cleared, scenario order was fixed, and the shared host drifted, so the report makes no SLA or causal multiplier claim. The largest observed setup working footprint was 157.3 MiB. The 200 MiB check detects excess after allocation; it is not a preventive disk quota. No timing CI threshold, runtime optimization, or retention-policy change is introduced.Fixes #39.