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cbb35ee27f
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Phase 13 v1 + E5-2 retest: Both NEUTRAL, freeze as research boxes
Phase 13 v1: Header Write Elimination (C7 preserve header)
- Verdict: NEUTRAL (+0.78%)
- Implementation: HAKMEM_TINY_C7_PRESERVE_HEADER ENV gate (default OFF)
- Makes C7 nextptr offset conditional (0→1 when enabled)
- 4-point matrix A/B test results:
* Case A (baseline): 51.49M ops/s
* Case B (WRITE_ONCE=1): 52.07M ops/s (+1.13%)
* Case C (C7_PRESERVE=1): 51.36M ops/s (-0.26%)
* Case D (both): 51.89M ops/s (+0.78% NEUTRAL)
- Action: Freeze as research box (default OFF, manual opt-in)
Phase 5 E5-2: Header Write-Once retest (promotion test)
- Verdict: NEUTRAL (+0.54%)
- Motivation: Phase 13 Case B showed +1.13%, re-tested with dedicated 20-run
- Results (20-run):
* Case A (baseline): 51.10M ops/s
* Case B (WRITE_ONCE=1): 51.37M ops/s (+0.54%)
- Previous test: +0.45% (consistent with NEUTRAL)
- Action: Keep as research box (default OFF, manual opt-in)
Key findings:
- Header write tax optimization shows consistent NEUTRAL results
- Neither Phase 13 v1 nor E5-2 reaches GO threshold (+1.0%)
- Both implemented as reversible ENV gates for future research
Files changed:
- New: core/box/tiny_c7_preserve_header_env_box.{c,h}
- Modified: core/box/tiny_layout_box.h (C7 offset conditional)
- Modified: core/tiny_nextptr.h, core/box/tiny_header_box.h (comments)
- Modified: core/bench_profile.h (refresh sync)
- Modified: Makefile (add new .o files)
- Modified: scripts/run_mixed_10_cleanenv.sh (add C7_PRESERVE ENV)
- Docs: PHASE13_*, PHASE5_E5_2_HEADER_WRITE_ONCE_* (design/results)
Next: Phase 14 (Pointer-chase reduction, tcache-style intrusive LIFO)
🤖 Generated with Claude Code
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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2025-12-15 00:32:25 +09:00 |
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d54893ea1d
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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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c2716f5c01
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Implement Phase 2: Headerless Allocator Support (Partial)
- Feature: Added HAKMEM_TINY_HEADERLESS toggle (A/B testing)
- Feature: Implemented Headerless layout logic (Offset=0)
- Refactor: Centralized layout definitions in tiny_layout_box.h
- Refactor: Abstracted pointer arithmetic in free path via ptr_conversion_box.h
- Verification: sh8bench passes in Headerless mode (No TLS_SLL_HDR_RESET)
- Known Issue: Regression in Phase 1 mode due to blind pointer conversion logic
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2025-12-03 12:11:27 +09:00 |
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a6aeeb7a4e
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Phase 1 Refactoring Complete: Box-based Logic Consolidation ✅
Summary:
- Task 1.1 ✅: Created tiny_layout_box.h for centralized class/header definitions
- Task 1.2 ✅: Updated tiny_nextptr.h to use layout Box (bitmasking optimization)
- Task 1.3 ✅: Enhanced ptr_conversion_box.h with Phantom Types support
- Task 1.4 ✅: Implemented test_phantom.c for Debug-mode type checking
Verification Results (by Task Agent):
- Box Pattern Compliance: ⭐⭐⭐⭐⭐ (5/5) - MISSION/DESIGN documented
- Type Safety: ⭐⭐⭐⭐⭐ (5/5) - Phantom Types working as designed
- Test Coverage: ⭐⭐⭐☆☆ (3/5) - Compile-time tests OK, runtime tests planned
- Performance: 0 bytes, 0 cycles overhead in Release build
- Build Status: ✅ Success (526KB libhakmem.so, zero warnings)
Key Achievements:
1. Single Source of Truth principle fully implemented
2. Circular dependency eliminated (layout→header→nextptr→conversion)
3. Release build: 100% inlining, zero overhead
4. Debug build: Full type checking with Phantom Types
5. HAK_RET_ALLOC macro migrated to Box API
Known Issues (unrelated to Phase 1):
- TLS_SLL_HDR_RESET from sh8bench (existing, will be resolved in Phase 2)
Next Steps:
- Phase 2 readiness: ✅ READY
- Recommended: Create migration guide + runtime test suite
- Alignment guarantee will be addressed in Phase 2 (Headerless layout)
🤖 Generated with Claude Code + Gemini (implementation) + Task Agent (verification)
Co-Authored-By: Gemini <gemini@example.com>
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-12-03 11:38:11 +09:00 |
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