871034da1f
Results: - A/B test: +2.72% on Mixed (10-run, clean env) - Baseline: 48.89M ops/s - Optimized: 50.22M ops/s - Improvement: +1.33M ops/s (+2.72%) - Stability: Standard deviation reduced by 60.8% (2.44M → 955K ops/s) Strategy: - Transplant C0-C3 "second hot" path to monolithic free_tiny_fast() - Early-exit within monolithic (no hot/cold split) - FastLane free now benefits from C0-C3 direct path Success factors: 1. Performance improvement: +2.72% (2.7x GO threshold) 2. Stability improvement: 2.6x more stable (stdev 60.8% reduction) 3. Learned from Phase 7 failure: - Phase 7: Function split (hot/cold) → NO-GO - Phase 9: Early-exit within monolithic → GO 4. FastLane free compatibility: C0-C3 direct path now works with FastLane 5. Policy snapshot overhead reduction: C0-C3 (48% of Mixed) skip route lookup Implementation: - Patch 1: ENV gate box (free_tiny_fast_mono_dualhot_env_box.h) - ENV: HAKMEM_FREE_TINY_FAST_MONO_DUALHOT=0/1 (default 0) - Probe window: 64 (avoid bench_profile putenv race) - Patch 2: Early-exit in free_tiny_fast() (malloc_tiny_fast.h) - Conditions: class_idx <= 3, !LARSON_FIX, route==LEGACY - Direct call: tiny_legacy_fallback_free_base() - Patch 3: Visibility (free_path_stats_box.h) - mono_dualhot_hit counter (compile-out in release) - Patch 4: cleanenv extension (run_mixed_10_cleanenv.sh) - ENV leak protection Files modified: - core/bench_profile.h: add to MIXED_TINYV3_C7_SAFE preset - core/front/malloc_tiny_fast.h: early-exit insertion - core/box/free_path_stats_box.h: counter - core/box/free_tiny_fast_mono_dualhot_env_box.h: NEW (ENV gate) - scripts/run_mixed_10_cleanenv.sh: ENV leak protection Health check: PASSED (all profiles) Promotion: Added to MIXED_TINYV3_C7_SAFE preset (default ON, opt-out) Rollback: HAKMEM_FREE_TINY_FAST_MONO_DUALHOT=0 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Docs Overview
このフォルダは hakmem の設計・計測・運用メモを体系化して管理する場所です。
- INDEX.md: 目次（各ドキュメントへのリンク）
- benchmarks/: ベンチマーク手順とスイープ結果の保存先
- specs/: 現在の仕様（SACS‑3/HW/ENV）を集約
- roadmap/: これからの実装計画・優先度・タスク
運用ルール（提案）
- 1つの変更/計測のまとまりにつき1ファイル（or 1フォルダ）
- 再現コマンド・環境変数・ハード構成は必ず記載
- 大きな連続出力はファイルへ保存し、本文からは抜粋/要約を記載