2025-12-17 21:08:17 +09:00
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# CURRENT_TASK(Rolling, SSOT)
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2025-12-12 16:26:42 +09:00
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2025-12-18 07:47:44 +09:00
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## 0) 今の「正」(SSOT)
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2025-12-16 05:35:11 +09:00
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2025-12-18 09:11:56 +09:00
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- **性能比較の正**: FAST PGO build(`make pgo-fast-full` → `bench_random_mixed_hakmem_minimal_pgo`)+ **WarmPool=16**
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2025-12-18 09:32:43 +09:00
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- Phase 75(C5/C6 inline slots)は presets に昇格済み
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- Phase 75-4 で FAST PGO rebase を実施し **C5+C6=ON が +3.16% (GO)** を確認(ただし **FAST PGO baseline 自体が Phase 69 から大きく後退**している疑い → Phase 75-5 で PGO 再生成が必要)
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2025-12-16 15:01:56 +09:00
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- **安全・互換の正**: Standard build(`make bench_random_mixed_hakmem`)
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- **観測の正**: OBSERVE build(`make perf_observe`)
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2025-12-18 07:47:44 +09:00
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- **スコアカード(目標/現在値)**: `docs/analysis/PERFORMANCE_TARGETS_SCORECARD.md`
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2025-12-18 09:11:56 +09:00
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- **FAST baseline(SSOT)**: `docs/analysis/PERFORMANCE_TARGETS_SCORECARD.md` を正とする(Phase 69: 62.63M ops/s = 51.77% of mimalloc)
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2025-12-18 09:32:43 +09:00
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- **Phase 75 の計測(Standard)**: `bench_random_mixed_hakmem` で **A/B +5.41%** を確認(Phase 75-3 4-point matrix)
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- **Phase 75 の計測(FAST PGO)**: `bench_random_mixed_hakmem_minimal_pgo` で **A/B +3.16%** を確認(Phase 75-4 4-point matrix)
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2025-12-18 09:11:56 +09:00
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- 次の目標: **M2 = 55%**(gap は FAST baseline を基準に判断する)
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- **Mixed 10-run SSOT(ハーネス)**: `scripts/run_mixed_10_cleanenv.sh`
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- デフォルト `BENCH_BIN=./bench_random_mixed_hakmem`(Standard)
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- FAST PGO は `BENCH_BIN=./bench_random_mixed_hakmem_minimal_pgo` を明示する
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- 既定: `ITERS=20000000 WS=400`、`HAKMEM_WARM_POOL_SIZE=16`、`HAKMEM_TINY_C5_INLINE_SLOTS=1`、`HAKMEM_TINY_C6_INLINE_SLOTS=1`
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2025-12-18 05:55:47 +09:00
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2025-12-18 07:47:44 +09:00
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## 1) 迷子防止(経路/観測)
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2025-12-18 05:55:47 +09:00
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2025-12-18 07:47:44 +09:00
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“経路が踏まれていない最適化” を防ぐための最小手順。
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2025-12-18 05:55:47 +09:00
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2025-12-18 07:47:44 +09:00
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- **Route Banner(経路の誤認を潰す)**: `HAKMEM_ROUTE_BANNER=1`
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- 出力: Route assignments(backend route kind)+ cache config(`unified_cache_enabled` / `warm_pool_max_per_class`)
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- **Refill観測のSSOT**: `docs/analysis/PHASE70_REFILL_OBSERVABILITY_PREREQS_SSOT.md`
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- WS=400(Mixed SSOT)では miss が極小 → `unified_cache_refill()` 最適化は **凍結(ROIゼロ)**
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2025-12-18 05:55:47 +09:00
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2025-12-18 07:47:44 +09:00
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## 2) 直近の結論(要点だけ)
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2025-12-18 05:55:47 +09:00
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2025-12-18 07:47:44 +09:00
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- **Phase 69(WarmPool sweep)**: `HAKMEM_WARM_POOL_SIZE=16` が **強GO(+3.26%)**、baseline 昇格済み。
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- 設計: `docs/analysis/PHASE69_REFILL_TUNING_0_DESIGN.md`
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- 結果: `docs/analysis/PHASE69_REFILL_TUNING_1_RESULTS.md`
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- **Phase 70(観測SSOT)**: 統計の見える化/前提ゲート確立。WS=400 SSOT では refill は冷たい。
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- SSOT: `docs/analysis/PHASE70_REFILL_OBSERVABILITY_PREREQS_SSOT.md`
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- **Phase 71/73(WarmPool=16 の勝ち筋確定)**: 勝ち筋は **instruction/branch の微減**(perf stat で確定)。
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- 詳細: `docs/analysis/PHASE70_71_WARMPOOL16_ANALYSIS.md`
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- **Phase 72(ENV knob ROI枯れ)**: WarmPool=16 を超える ENV-only 勝ち筋なし → **構造(コード)で攻める段階**。
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2025-12-18 05:55:47 +09:00
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2025-12-18 07:47:44 +09:00
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## 3) 運用ルール(Box Theory + layout tax 対策)
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2025-12-18 05:55:47 +09:00
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2025-12-18 07:47:44 +09:00
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- 変更は必ず **箱 + 境界1箇所 + ENVで戻せる** で積む(Fail-fast、最小可視化)。
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- A/B は **同一バイナリでENVトグル**が原則(別バイナリ比較は layout が混ざる)。
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2025-12-18 10:22:24 +09:00
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- SSOT運用(ころころ防止): `docs/analysis/PHASE75_6_SSOT_POLICY_FAST_PGO_VS_STANDARD.md`
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2025-12-18 07:47:44 +09:00
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- “削除して速い” は封印(link-out/大削除は layout tax で符号反転しやすい)→ **compile-out** を優先。
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- 診断: `scripts/box/layout_tax_forensics_box.sh` / `docs/analysis/PHASE67A_LAYOUT_TAX_FORENSICS_SSOT.md`
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2025-12-18 05:55:47 +09:00
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2025-12-18 07:47:44 +09:00
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## 4) 次の指示書(Active)
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2025-12-18 05:55:47 +09:00
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2025-12-18 07:47:44 +09:00
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### Phase 74(構造): UnifiedCache hit-path を短くする ✅ **P1 (LOCALIZE) 凍結**
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2025-12-18 05:55:47 +09:00
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2025-12-18 07:47:44 +09:00
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**前提**:
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- WS=400 SSOT では UnifiedCache miss が極小 → refill最適化は ROIゼロ。
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- WarmPool=16 の勝ちは instruction/branch 微減 → hit-path を短くするのが正攻法。
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2025-12-18 05:55:47 +09:00
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2025-12-18 07:47:44 +09:00
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**Phase 74-1: LOCALIZE (ENV-gated)** ✅ **完了 (NEUTRAL +0.50%)**
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- ENV: `HAKMEM_TINY_UC_LOCALIZE=0/1`
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- Runtime branch overhead で instructions/branches **増加** (+0.7%/+0.4%)
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- 判定: **NEUTRAL (+0.50%)**
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2025-12-18 06:11:21 +09:00
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2025-12-18 07:47:44 +09:00
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**Phase 74-2: LOCALIZE (compile-time gate)** ✅ **完了 (NEUTRAL -0.87%)**
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- Build flag: `HAKMEM_TINY_UC_LOCALIZE_COMPILED=0/1` (default 0)
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- Runtime branch 削除 → instructions/branches **改善** (-0.6%/-2.3%) ✓
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- しかし **cache-misses +86%** (register pressure / spill) → throughput **-0.87%**
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- 切り分け成功: **LOCALIZE本体は勝ち、cache-miss 増加で相殺**
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- 判定: **NEUTRAL (-0.87%)** → **P1 (LOCALIZE) 凍結**
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2025-12-18 06:11:21 +09:00
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2025-12-18 07:47:44 +09:00
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**結論**:
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- P1 (LOCALIZE) は default OFF で凍結(dependency chain 削減の ROI 低い)
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- 次: **Phase 74-3 (P0: FASTAPI)** へ進む
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2025-12-18 06:11:21 +09:00
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2025-12-18 08:22:09 +09:00
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**Phase 74-3: P0 (FASTAPI)** ✅ **完了 (NEUTRAL +0.32%)**
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2025-12-18 06:11:21 +09:00
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2025-12-18 07:47:44 +09:00
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**Goal**: `unified_cache_enabled()` / `lazy-init` / `stats` 判定を **hot loop の外へ追い出す**
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2025-12-18 03:44:51 +09:00
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2025-12-18 07:47:44 +09:00
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**Approach**:
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- `unified_cache_push_fast()` / `unified_cache_pop_fast()` API 追加
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- 前提: "valid/enabled/no-stats" を caller 側で保証
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- Fail-fast: 想定外の状態なら slow path へ fallback(境界1箇所)
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- ENV gate: `HAKMEM_TINY_UC_FASTAPI=0/1` (default 0, research box)
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2025-12-17 16:27:06 +09:00
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2025-12-18 08:22:09 +09:00
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**Results** (10-run Mixed SSOT, WS=400):
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- Throughput: **+0.32%** (NEUTRAL, below +1.0% GO threshold)
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- cache-misses: **-16.31%** (positive signal, insufficient throughput gain)
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2025-12-18 06:11:21 +09:00
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2025-12-18 08:22:09 +09:00
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**判定**: **NEUTRAL (+0.32%)** → **P0 (FASTAPI) 凍結**
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2025-12-18 06:11:21 +09:00
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2025-12-18 07:47:44 +09:00
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**参考**:
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- 設計: `docs/analysis/PHASE74_UNIFIEDCACHE_HITPATH_STRUCTURAL_OPT_0_DESIGN.md`
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- 指示書: `docs/analysis/PHASE74_UNIFIEDCACHE_HITPATH_STRUCTURAL_OPT_1_NEXT_INSTRUCTIONS.md`
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2025-12-18 08:22:09 +09:00
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- 結果 (P1/P0): `docs/analysis/PHASE74_UNIFIEDCACHE_HITPATH_STRUCTURAL_OPT_2_RESULTS.md`
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---
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2025-12-18 09:11:56 +09:00
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## Phase 75(構造): Hot-class Inline Slots (P2) ✅ **完了(Standard A/B)**
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2025-12-18 08:22:09 +09:00
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**Goal**: C4-C7 の統計分析 → targeted optimization 戦略決定
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**前提** (Phase 74 learnings):
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- UnifiedCache hit-path optimization の ROI が低い ← register pressure / cache-miss effects
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- 次の軸: **per-class 特性を活用** → TLS-direct inline slots で branch elimination
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**Phase 75-0: Per-Class Analysis** ✅ **完了**
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Per-class Unified-STATS (Mixed SSOT, WS=400, HAKMEM_MEASURE_UNIFIED_CACHE=1):
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| Class | Capacity | Occupied | Hits | Pushes | Total Ops | Hit % | % of C4-C7 |
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|-------|----------|----------|------|--------|-----------|-------|-----------|
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| C6 | 128 | 127 | 2,750,854 | 2,750,855 | **5,501,709** | 100% | **57.2%** |
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| C5 | 128 | 127 | 1,373,604 | 1,373,605 | **2,747,209** | 100% | **28.5%** |
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| C4 | 64 | 63 | 687,563 | 687,564 | **1,375,127** | 100% | **14.3%** |
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| C7 | ? | ? | ? | ? | **?** | ? | **?** |
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**Key findings**:
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1. C6 圧倒的支配: 57.2% の操作 (2.75M hits)
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2. 全クラス 100% hit rate (refill inactive in SSOT)
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3. Cache occupancy near-capacity (98-99%)
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2025-12-18 08:39:48 +09:00
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**Phase 75-1: C6-only Inline Slots** ✅ **完了 (GO +2.87%)**
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2025-12-18 08:22:09 +09:00
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2025-12-18 08:39:48 +09:00
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**Approach**: Modular box theory design with single decision point at TLS init
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2025-12-18 08:22:09 +09:00
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2025-12-18 08:39:48 +09:00
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**Implementation** (5 new boxes + test script):
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- ENV gate box: `HAKMEM_TINY_C6_INLINE_SLOTS=0/1` (lazy-init, default OFF)
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- TLS extension: 128-slot ring buffer (1KB per thread, zero overhead when OFF)
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- Fast-path API: `c6_inline_push()` / `c6_inline_pop()` (always_inline, 1-2 cycles)
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- Integration: Minimal (2 boundary points: alloc/free for C6 class only)
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- Backward compatible: Legacy code intact, fail-fast to unified_cache
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**Results** (10-run Mixed SSOT, WS=400):
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- Baseline (C6 inline OFF): **44.24 M ops/s**
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- Treatment (C6 inline ON): **45.51 M ops/s**
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- Delta: **+1.27 M ops/s (+2.87%)**
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**Decision**: ✅ **GO** (exceeds +1.0% strict threshold)
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**Mechanism**: Branch elimination on unified_cache for C6 (57.2% of C4-C7 ops)
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2025-12-18 08:22:09 +09:00
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**参考**:
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2025-12-18 08:39:48 +09:00
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- Per-class分析: `docs/analysis/PHASE75_PERCLASS_ANALYSIS_0_SSOT.md`
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- 結果: `docs/analysis/PHASE75_C6_INLINE_SLOTS_1_RESULTS.md`
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---
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2025-12-18 08:53:01 +09:00
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**Phase 75-2: C5 Inline Slots** ✅ **完了 (GO +1.10%)**
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2025-12-18 08:39:48 +09:00
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2025-12-18 08:53:01 +09:00
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**Goal**: C5-only isolated measurement (28.5% of C4-C7) for individual contribution
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2025-12-18 08:39:48 +09:00
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2025-12-18 08:53:01 +09:00
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**Approach**: Replicate C6 pattern with careful isolation
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2025-12-18 08:39:48 +09:00
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- Add C5 ring buffer (128 slots, 1KB TLS)
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2025-12-18 08:53:01 +09:00
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- ENV gate: `HAKMEM_TINY_C5_INLINE_SLOTS=0/1` (default OFF)
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- Test strategy: C5-only (baseline C5=OFF+C6=ON, treatment C5=ON+C6=ON)
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- Integration: alloc/free boundary points (C5 FIRST, then C6, then unified_cache)
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**Results** (10-run Mixed SSOT, WS=400):
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- Baseline (C5=OFF, C6=ON): **44.26 M ops/s** (σ=0.37)
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- Treatment (C5=ON, C6=ON): **44.74 M ops/s** (σ=0.54)
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- Delta: **+0.49 M ops/s (+1.10%)**
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**Decision**: ✅ **GO** (C5 individual contribution validated)
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**Cumulative Performance**:
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- Phase 75-1 (C6): +2.87%
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- Phase 75-2 (C5 isolated): +1.10%
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- Combined potential: ~+3.97% (if additive)
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**参考**:
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- 実装詳細: `docs/analysis/PHASE75_2_C5_INLINE_SLOTS_IMPLEMENTATION.md`
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---
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**Phase 75-3: C5+C6 Interaction Test (4-Point Matrix A/B)** ✅ **完了 (STRONG GO +5.41%)**
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**Goal**: Comprehensive interaction test + final promotion decision
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**Approach**: 4-point matrix A/B test (single binary, ENV-only configuration)
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- Point A (C5=0, C6=0): Baseline
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- Point B (C5=1, C6=0): C5 solo
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- Point C (C5=0, C6=1): C6 solo
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- Point D (C5=1, C6=1): C5+C6 combined
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**Results** (10-run per point, Mixed SSOT, WS=400):
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- **Point A (baseline)**: 42.36 M ops/s
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- **Point B (C5 solo)**: 43.54 M ops/s (+2.79% vs A)
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- **Point C (C6 solo)**: 44.25 M ops/s (+4.46% vs A)
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- **Point D (C5+C6)**: 44.65 M ops/s (+5.41% vs A) **[MAIN TARGET]**
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**Additivity Analysis**:
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- Expected additive (B+C-A): 45.43 M ops/s
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- Actual (D): 44.65 M ops/s
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- Sub-additivity: **1.72%** (near-perfect additivity, minimal negative interaction)
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**Perf Stat Validation (D vs A)**:
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- Instructions: -6.1% (function call elimination confirmed)
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- Branches: -6.1% (matches instruction reduction)
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- Cache-misses: -31.5% (improved locality, NOT +86% like Phase 74-2)
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- Throughput: +5.41% (net positive)
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**Decision**: ✅ **STRONG GO (+5.41%)**
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- D vs A: +5.41% >> 3.0% threshold
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- Sub-additivity: 1.72% << 20% acceptable
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- Phase 73 thesis validated: instructions/branches DOWN, throughput UP
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**Promotion Completed**:
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1. `core/bench_profile.h`: Added C5+C6 defaults to `bench_apply_mixed_tinyv3_c7_common()`
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2. `scripts/run_mixed_10_cleanenv.sh`: Added C5+C6 ENV defaults
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3. C5+C6 inline slots now **promoted to preset defaults** for MIXED_TINYV3_C7_SAFE
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2025-12-18 09:11:56 +09:00
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**Phase 75 Complete**: C5+C6 inline slots (129-256B) deliver +5.41% proven gain **on Standard binary**(`bench_random_mixed_hakmem`)。
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- FAST PGO baseline(スコアカード)を更新する前に、`BENCH_BIN=./bench_random_mixed_hakmem_minimal_pgo` で **同条件の A/B(C5/C6 OFF/ON)** を再計測すること。
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2025-12-18 08:53:01 +09:00
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2025-12-18 09:32:43 +09:00
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### Phase 75-4(FAST PGO rebase)✅ 完了
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- 結果: **+3.16% (GO)**(4-point matrix、outlier 除外後)
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- 詳細: `docs/analysis/PHASE75_4_FAST_PGO_REBASE_RESULTS.md`
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- 重要: Phase 69 の FAST baseline (62.63M) と比較して **現行 FAST PGO baseline が大きく低い**疑い(PGO profile staleness / training mismatch / build drift)
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### Phase 75-5(PGO 再生成)🟥 次のActive(HIGH PRIORITY)
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目的:
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- C5/C6 inline slots を含む現行コードに対して PGO training を再生成し、Phase 69 クラスの FAST baseline を取り戻す。
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手順(骨子):
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1. PGO training を “C5/C6=ON” 前提で回す(training 時に `HAKMEM_TINY_C5_INLINE_SLOTS=1` / `HAKMEM_TINY_C6_INLINE_SLOTS=1` を必ず設定)
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2. `make pgo-fast-full` で `bench_random_mixed_hakmem_minimal_pgo` を再生成
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3. 10-run で baseline を再測定し、Phase 75-4 の Point A/D を再計測
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4. Layout tax / drift の疑いが出たら `scripts/box/layout_tax_forensics_box.sh` で原因分類
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2025-12-18 08:53:01 +09:00
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**参考**:
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- 4-point matrix 結果: `docs/analysis/PHASE75_3_C5_C6_INTERACTION_RESULTS.md`
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- Test script: `scripts/phase75_3_matrix_test.sh`
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2025-12-18 06:11:21 +09:00
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2025-12-18 07:47:44 +09:00
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## 5) アーカイブ
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2025-12-17 16:34:03 +09:00
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2025-12-17 21:08:17 +09:00
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- 詳細ログ: `CURRENT_TASK_ARCHIVE_20251210.md`
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2025-12-18 07:47:44 +09:00
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- 整理前スナップショット: `docs/analysis/CURRENT_TASK_ARCHIVE.md`
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