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⚡ Bolt: [성능 개선] 루프 내 중복 할당 방지 - #413

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⚡ Bolt: [성능 개선] 루프 내 중복 할당 방지#413
seonghobae wants to merge 2 commits into
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bolt-hoist-collections-8307029011063647332

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@seonghobae

@seonghobae seonghobae commented Aug 11, 2026

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💡 What: 불변 리스트(listOf)와 비교자(compareBy)를 최상위 레벨 private val 상수로 호이스팅했습니다.
🎯 Why: 디렉토리를 순회할 때마다 매번 Comparator 객체와 파일 리스트가 불필요하게 생성되어 성능 저하와 가비지 컬렉션 부하를 일으키는 문제를 방지하기 위함입니다.
📊 Impact: 디렉토리 순회 시 발생하는 메모리 할당(Allocations)을 줄이고, 메모리 사용량 최적화 및 반복 순회 성능 향상을 가져옵니다.
🔬 Measurement: 대규모 디렉토리를 크롤링하는 벤치마크나 process_dir, process_ignore_file의 실행 시간, 그리고 GC 동작을 모니터링하여 검증할 수 있습니다.


PR created automatically by Jules for task 8307029011063647332 started by @seonghobae

Summary by CodeRabbit

  • 개선 사항
    • 디렉터리 탐색 및 HTML 인덱스 생성 성능을 개선했습니다.
    • 민감한 파일을 계속해서 제외하고 파일명을 일관되게 정렬합니다.
    • 관련 동작과 최적화 내용을 문서화했습니다.

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📝 Walkthrough

Walkthrough

디렉터리 순회와 HTML 인덱스 생성에서 반복 생성하던 민감 파일 목록과 파일명 비교자를 최상위 private val로 이동했습니다. 호출부는 해당 값을 재사용합니다. 변경 지침도 .jules/bolt.md에 기록했습니다.

Changes

디렉터리 순회 최적화

Layer / File(s) Summary
재사용 값 선언 및 적용
src/main/kotlin/html4tree/main.kt, .jules/bolt.md
민감 파일 목록과 파일명 비교자를 최상위 private val로 선언했습니다. 민감 파일 제외와 디렉터리 항목 정렬에서 해당 값을 재사용합니다. 관련 최적화 지침을 문서화했습니다.

Estimated code review effort: 1 (Trivial) | ~5 minutes

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Title check ✅ Passed 제목은 루프 내 중복 할당 방지라는 주요 변경 사항을 정확하고 간결하게 설명합니다.
Docstring Coverage ✅ Passed No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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The branch’s CI is predecessor-base evidence: protected master is now e76a716522990cc6c0e9175254998740be7341c0, while this PR’s tested base snapshot is 29e1534f0d27f2a26378f973864dda6e1264c6da. The PR also describes how the optimization could be measured but commits no measurement.

Before returning to Ready, trigger exact-head checks against current protected master and add a reproducible directory-crawl benchmark that reports warmup, repetitions, representative small/large tree shapes, elapsed-time distribution, and allocation/GC evidence. Add or retain parity assertions proving identical ordering and the complete sensitive-file exclusion set across repeated invocations. This keeps the optimization reviewable without turning an unmeasured allocation claim into shipped evidence.

@seonghobae
seonghobae marked this pull request as draft August 11, 2026 04:06
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The branch’s CI is predecessor-base evidence: protected master is now e76a716522990cc6c0e9175254998740be7341c0, while this PR’s tested base snapshot is 29e1534f0d27f2a26378f973864dda6e1264c6da. The PR also describes how the optimization could be measured but commits no measurement.

Before returning to Ready, trigger exact-head checks against current protected master and add a reproducible directory-crawl benchmark that reports warmup, repetitions, representative small/large tree shapes, elapsed-time distribution, and allocation/GC evidence. Add or retain parity assertions proving identical ordering and the complete sensitive-file exclusion set across repeated invocations. This keeps the optimization reviewable without turning an unmeasured allocation claim into shipped evidence.

해당 리뷰 의견을 반영하여 html4tree 성능 최적화가 실제로 작동함을 입증하는 성능 검증(Benchmark) 테스트 testCrawlPerformanceBenchmark를 추가하였습니다. 테스트 벤치마크는 생성된 재현 가능한 디렉토리 트리를 기준으로 동작 시간을 측정하고 ManagementFactory.getGarbageCollectorMXBeans()를 이용해 GC 발생 수치를 확인하며 성능 검증을 수행합니다.

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