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Phase 3 C3: Static Routing A/B Test ADOPT (+2.20% Mixed gain)
Step 2 & 3 Complete:
- A/B test (Mixed 10-run): STATIC_ROUTE=0 (38.91M) → =1 (39.77M) = +2.20% avg
- Median gain: +1.98%
- Result: ✅ GO (exceeds +1.0% threshold)
- Decision: ✅ ADOPT into MIXED_TINYV3_C7_SAFE preset
- bench_profile.h line 77: HAKMEM_TINY_STATIC_ROUTE=1 default
- Learner auto-disables static route when HAKMEM_SMALL_LEARNER_V7_ENABLED=1
Implementation Summary:
- core/box/tiny_static_route_box.{h,c}: Research box (Step 1A)
- core/front/malloc_tiny_fast.h: Route lookup integration (Step 1B, lines 249-256)
- core/bench_profile.h: Bench sync + preset adoption
Cumulative Phase 2-3 Gains:
- B3 (Routing shape): +2.89%
- B4 (Wrapper split): +1.47%
- C3 (Static routing): +2.20%
- Total: ~6.8% (35.2M → ~39.8M ops/s)
Next: Phase 3 C1 (TLS Prefetch, expected +2-4%)
🤖 Generated with Claude Code
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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2025-12-13 18:46:11 +09:00 |
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Phase 3 C3: Tiny Static Routing Box Implementation (Step 1A)
Research Box Implementation:
- core/box/tiny_static_route_box.h: TinyStaticRoute struct & API
- core/box/tiny_static_route_box.c: Static route table management
- Makefile: Added tiny_static_route_box.o to 3 OBJS lists
Design:
- ENV gate: HAKMEM_TINY_STATIC_ROUTE=0/1 (default: 0)
- Learner auto-disable: If HAKMEM_TINY_LEARNER_ENABLED=1, force OFF
- Constructor priority: 102 (runs after wrapper_env_ctor at 101)
- Thread-safe: Atomic CAS for exactly-once initialization
Baseline Profiling (Step 0 Complete):
- Throughput: 46.2M ops/s (10M iterations × 400 ws)
- Instructions/cycle: 2.11 insn/cycle
- Frontend stalls: 10.62% (memory latency bottleneck)
- Cache-misses: 3.46% of references
Expected C3 gain: +5-8% (policy_snapshot bypass)
Next Steps (Step 1B onwards):
1. Integrate static route into malloc_tiny_fast_for_class()
2. A/B test: Mixed 10-run, expect +1% minimum for GO
3. Decision: GO if +1%, NO-GO if -1%, else freeze
Status:
✅ Phase 2 (B3+B4): +4.4% cumulative
✅ Phase 3 planning & C3 Step 0-1A complete
⏳ Phase 3 C3 Step 1B-3 pending (malloc integration & testing)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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2025-12-13 18:04:14 +09:00 |
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