# Complete - m-performance-hotspot-optimization/05+04_go_sustained_memory_metric

## 완료 일시

2026-06-06

## 요약

Go sustained stress harness의 latency sample 보관을 deterministic bounded reservoir sampling으로 제한해 30분 sustained memory peak가 harness sample 누적 artifact인지 분리할 수 있게 함. 1 loop, 최종 판정 PASS.

## 루프 이력

| Plan | Review | Verdict | 메모 |
|------|--------|---------|------|
| `plan_cloud_G07_0.log` | `code_review_cloud_G07_0.log` | PASS | sustained row schema와 stability hard gate를 유지하면서 request count와 percentile sample count를 분리. Required/Suggested 0. |

## 구현/정리 내용

- `go/bench/stress.go`: `boundedLatencyCollector`와 `maxSustainedLatencySamples=100000`을 추가해 sustained profile이 모든 latency sample을 무제한 보관하지 않게 했다.
- `go/bench/stress.go`: `summarizeWithCount`로 throughput/request count는 전체 성공 request count를 사용하고 p50/p95/p99는 bounded sample snapshot으로 계산하도록 분리했다.
- `go/bench/stress.go`: sustained memory metric이 sample cap 제약의 영향을 받는다는 코드 주석을 추가했다.

## 최종 검증

- `cd go && go test -count=1 ./...` - PASS; root package PASS, crosstest/example/packets packages no test files, `go/test` PASS.
- `bash agent-ops/skills/project/run-proto-socket-test-matrix/scripts/run_stress.sh --quick --lang go --transport tcp --profile sustained` - PASS; review 재현 record `agent-test/runs/20260605-195820-proto-socket-stress-quick.md`, Go TCP sustained stability violations 0.
- `bash agent-ops/skills/project/run-proto-socket-test-matrix/scripts/run_performance.sh --quick` - PASS; implementation record `agent-test/runs/20260605-194011-proto-socket-performance-quick.md`, same-language/cross-language/typescript-gateway PASS, regression_result SKIPPED.
- `rg --sort path -n "sustained \\| duration=.* \\| Go \\| tcp|sustained \\| duration=.* \\| Go \\| ws|regression_result:|warning rows:" agent-test/runs/20260605-194011-proto-socket-performance-quick.md` - PASS; Go TCP/WS sustained rows are PASS with stability violations 0, regression_result SKIPPED.
- `git diff --check` - PASS; 출력 없음.

## Roadmap Completion

- Milestone: `agent-roadmap/milestones/performance-hotspot-optimization.md`
- Completed task ids:
  - `go-sustained-memory-metric`: PASS; evidence=`plan_cloud_G07_0.log`, `code_review_cloud_G07_0.log`; verification=`agent-test/runs/20260605-195820-proto-socket-stress-quick.md`, `agent-test/runs/20260605-194011-proto-socket-performance-quick.md`
- Not completed task ids: 없음

## 잔여 Nit

- 없음

## 후속 작업

- 없음
