⚡ Bolt: 불필요한 배열 할당 및 Date 파싱 최적화 (성능 개선) - #399
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📝 WalkthroughWalkthroughAPI의 과거 날짜 수집과 Changes처리 성능 최적화
Estimated code review effort: 2 (Simple) | ~10 minutes Possibly related PRs
Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
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Actionable comments posted: 1
🧹 Nitpick comments (1)
packages/web/src/app/api/events/route.ts (1)
187-195: 🚀 Performance & Scalability | 🔵 Trivial | ⚡ Quick win날짜 키를 숫자로 유지해 불필요한 변환을 제거하세요.
ms는 이미 UTC 자정의 epoch 값입니다. 하지만Line 192에서 ISO 문자열로 직렬화한 뒤Line 200에서 다시Date로 파싱합니다. 과거 날짜가 많으면 불필요한 문자열 할당과Date생성을 추가합니다.Set<number>에ms를 저장하고Date배열을 직접 생성하세요.제안된 수정
- const pastDatesSet = new Set<string>() + const pastDatesSet = new Set<number>() for (const u of payload.usagePerTurn) { const d = new Date(u.timestamp) const ms = Date.UTC(d.getUTCFullYear(), d.getUTCMonth(), d.getUTCDate()) if (ms < todayMs) { - pastDatesSet.add(new Date(ms).toISOString()) + pastDatesSet.add(ms) } } - const pastDates = Array.from(pastDatesSet) + const pastDates = Array.from( + pastDatesSet, + (dateMs) => new Date(dateMs), + )
Line 200도 다음과 같이 변경해야 합니다.- date: { in: pastDates.map((iso) => new Date(iso)) }, + date: { in: pastDates },🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@packages/web/src/app/api/events/route.ts` around lines 187 - 195, Update the past-date collection in the usage-per-turn processing to use Set<number> and store each UTC-midnight ms value directly instead of converting it to an ISO string. Update the downstream pastDates construction to create Date objects directly from those numeric keys, preserving the existing filtering and ordering behavior.
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In @.jules/bolt.md:
- Around line 2-4: Update the “Date Parsing and Chain Iteration Optimizations”
entry in .jules/bolt.md to accurately distinguish the costs: describe filter/map
chains as two O(N) passes plus O(N) intermediate allocation, and date parsing
inside sort comparators as approximately O(N log N) parses/allocations. Also
revise the matching O(N*M) description near the events API logic associated with
the visible Line 186 reference in packages/web/src/app/api/events/route.ts.
---
Nitpick comments:
In `@packages/web/src/app/api/events/route.ts`:
- Around line 187-195: Update the past-date collection in the usage-per-turn
processing to use Set<number> and store each UTC-midnight ms value directly
instead of converting it to an ISO string. Update the downstream pastDates
construction to create Date objects directly from those numeric keys, preserving
the existing filtering and ordering behavior.
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Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
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📒 Files selected for processing (3)
.jules/bolt.mdpackages/web/src/app/api/events/route.tspackages/web/src/components/dashboard/session-timeline-chart.tsx
| ## 2025-02-12 - Date Parsing and Chain Iteration Optimizations | ||
| **Learning:** In both API routes and client chart components, chaining `.filter()` and `.map()` over large arrays or instantiating `Date` objects inside tight loops or `sort()` comparators results in severe `O(N*M)` or `O(N log N)` allocation bottlenecks and multiple intermediate garbage collections. | ||
| **Action:** When filtering/mapping large arrays, use a single `for...of` loop with a `Set` (or push to an array) instead of `.filter().map()` chains. When sorting by dates, implement a Schwartzian transform by pre-parsing the timestamps into primitives (e.g., `.getTime()`) once beforehand. |
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📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win
복잡도 설명을 실제 연산에 맞게 수정하세요.
.filter().map() 체인은 일반적으로 두 번의 O(N) 순회와 O(N) 중간 배열 할당을 수행합니다. 이 연산은 O(N*M)이 아닙니다. sort() 비교 함수에서 날짜를 파싱하면 일반적인 비교 정렬에서 약 O(N log N)번의 파싱과 할당이 발생할 수 있습니다. 두 경우를 분리해 기록해야 이 지침이 잘못된 병목 분석을 유도하지 않습니다. 동일한 O(N*M) 표현을 사용하는 packages/web/src/app/api/events/route.ts의 Line 186도 함께 수정하세요.
제안된 수정
-**Learning:** In both API routes and client chart components, chaining `.filter()` and `.map()` over large arrays or instantiating `Date` objects inside tight loops or `sort()` comparators results in severe `O(N*M)` or `O(N log N)` allocation bottlenecks and multiple intermediate garbage collections.
+**Learning:** In both API routes and client chart components, chaining `.filter()` and `.map()` over large arrays performs two `O(N)` passes and allocates intermediate arrays. Instantiating `Date` objects inside `sort()` comparators can cause approximately `O(N log N)` parsing and allocation work, increasing garbage-collection pressure.🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In @.jules/bolt.md around lines 2 - 4, Update the “Date Parsing and Chain
Iteration Optimizations” entry in .jules/bolt.md to accurately distinguish the
costs: describe filter/map chains as two O(N) passes plus O(N) intermediate
allocation, and date parsing inside sort comparators as approximately O(N log N)
parses/allocations. Also revise the matching O(N*M) description near the events
API logic associated with the visible Line 186 reference in
packages/web/src/app/api/events/route.ts.
1 participant
💡 What:
session-timeline-chart.tsx및events/route.ts에서 불필요한 반복문 중첩(filter, map)과Date객체 생성 방식을 단일 루프 및 사전 파싱 방식으로 변경했습니다.🎯 Why: 정렬 함수의 비교기(comparator) 내부나 필터/맵 체이닝 과정에서 반복적인
Date객체 할당과 다중 O(N) 순회가 발생해 성능 저하 및 메모리 가비지 컬렉션 부하를 야기합니다.📊 Impact:
session-timeline-chart.tsx에서 정렬 전 사전 날짜 파싱을 통해O(N log N)객체 할당을 방지.events/route.ts및 차트 내에서.filter().map()체인을 하나의 루프로 병합하여 배열 순회 횟수를 단축하고 임시 배열 할당을 제거.🔬 Measurement: 대량의 툴 이벤트나 세션 사용량이 있을 때 클라이언트 렌더링 지연 시간 및 API 이벤트 처리 시간 감소.
PR created automatically by Jules for task 12076806521130125588 started by @seonghobae
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