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Target: Eliminate E1 lazy init check overhead (3.22% self%) - E1 consolidated ENV gates but lazy check remained in hot path - Strategy: __attribute__((constructor(101))) for pre-main init Implementation: - ENV gate: HAKMEM_ENV_SNAPSHOT_CTOR=0/1 (default 0, research box) - core/box/hakmem_env_snapshot_box.c: Constructor function added - Reads ENV before main() when CTOR=1 - Refresh also syncs gate state for bench_profile putenv - core/box/hakmem_env_snapshot_box.h: Dual-mode enabled check - CTOR=1 fast path: direct global read (no lazy branch) - CTOR=0 fallback: legacy lazy init (rollback safe) - Branch hints adjusted for default OFF baseline A/B Test Results (Mixed, 10-run, 20M iters, E1=1): - Baseline (CTOR=0): 44.28M ops/s (mean), 44.60M ops/s (median) - Optimized (CTOR=1): 46.38M ops/s (mean), 46.53M ops/s (median) - Improvement: +4.75% mean, +4.35% median Decision: GO (+4.75% >> +0.5% threshold) - Expected +0.5-1.5%, achieved +4.75% - Lazy init branch overhead was larger than expected - Action: Keep as research box (default OFF), evaluate promotion Phase 4 Cumulative: - E1 (ENV Snapshot): +3.92% - E2 (Alloc Per-Class): -0.21% (NEUTRAL, frozen) - E3-4 (Constructor Init): +4.75% - Total Phase 4: ~+8.5% Deliverables: - docs/analysis/PHASE4_E3_ENV_CONSTRUCTOR_INIT_DESIGN.md - docs/analysis/PHASE4_E3_ENV_CONSTRUCTOR_INIT_NEXT_INSTRUCTIONS.md - docs/analysis/PHASE4_COMPREHENSIVE_STATUS_ANALYSIS.md - docs/analysis/PHASE4_EXECUTIVE_SUMMARY.md - scripts/verify_health_profiles.sh (sanity check script) - CURRENT_TASK.md (E3-4 complete, next instructions) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
69 lines
2.2 KiB
Markdown
69 lines
2.2 KiB
Markdown
# Phase 4 Status - Executive Summary
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**Date**: 2025-12-14
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**Status**: E1 GO（opt-in）, E2 FROZEN, E3-4 GO（opt-in）
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**Baseline**: Mixed 20M/ws=400（E1/E3-4 の ON/OFF に依存。結果は各 A/B セクション参照）
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---
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## Quick Status
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### E2 Decision: FREEZE ✅ (NEUTRAL)
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**Result**: -0.21% mean, -0.62% median (NEUTRAL)
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**Why Freeze?**
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- Alloc route optimization saturated by Phase 3 C3 (static routing)
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- Free DUALHOT worked (+13%) because it skipped expensive ops
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- Alloc DUALHOT doesn't work (-0.21%) because route already cached
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- **Lesson**: Per-class specialization only helps when bypassing uncached overhead
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**Action**: Keep as research box (default OFF), no further investigation
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---
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## E1/E3-4 Results (Mixed A/B)
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### E1: ENV Snapshot Consolidation ✅ GO (opt-in)
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**Result**: +3.92% avg, +4.01% median
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**ENV**: `HAKMEM_ENV_SNAPSHOT=1`（default OFF）
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### E3-4: ENV Constructor Init ✅ GO (opt-in)
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**Result**: +4.75% mean, +4.35% median（E1=1 前提）
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**ENV**: `HAKMEM_ENV_SNAPSHOT=1 HAKMEM_ENV_SNAPSHOT_CTOR=1`（default OFF）
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**Note**: “constructor での pre-main init” を効かせたい場合はプロセス起動前に ENV を設定（bench_profile putenv だけでは遅い）
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---
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## Phase 4 Cumulative Status
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**Active**:
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- E1 (ENV Snapshot): +3.92% ✅ GO（opt-in）
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- E3-4 (ENV CTOR): +4.75% ✅ GO（opt-in, requires E1）
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**Frozen**:
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- D3 (Alloc Gate Shape): +0.56% ⚪
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- E2 (Alloc Per-Class FastPath): -0.21% ⚪
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## Next Actions
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1. E3-4 の “hint/refresh” 調整後に 10-run 再確認（昇格前の最終ゲート）
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2. GO 維持なら `ENV_PROFILE_PRESETS.md` と `CURRENT_TASK.md` に “E1+E3-4 の推奨セット” を明記
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3. E1/E3-4 ON の状態で perf を取り直して次の芯を選ぶ（alloc gate / free_tiny_fast_cold など）
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---
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## Key Lessons
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1. **Route optimization saturated**: C3 already cached routes, E2 no benefit
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2. **Shape optimization plateaued**: D3 +0.56% neutral, branch prediction saturated
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3. **ENV consolidation successful**: E1 +3.92%, constructor init is next step
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4. **Different optimization vectors needed**: Move beyond route/shape to init/dispatch overhead
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---
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**Full Analysis**: `/mnt/workdisk/public_share/hakmem/docs/analysis/PHASE4_COMPREHENSIVE_STATUS_ANALYSIS.md`
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