Moe Charm (CI)
bb70d422dc
Phase 13-B: TinyHeapV2 supply path with dual-mode A/B framework (Stealing vs Leftover)
Summary:
- Implemented free path supply with ENV-gated A/B modes (HAKMEM_TINY_HEAP_V2_LEFTOVER_MODE)
- Mode 0 (Stealing, default): L0 gets freed blocks first → +18% @ 32B
- Mode 1 (Leftover): L1 primary owner, L0 gets leftovers → Box-clean but -5% @ 16B
- Decision: Default to Stealing for performance (ChatGPT analysis: L0 doesn't corrupt learning layer signals)
Performance (100K iterations, workset=128):
- 16B: 43.9M → 45.6M ops/s (+3.9%)
- 32B: 41.9M → 49.6M ops/s (+18.4%) ✅
- 64B: 51.2M → 51.5M ops/s (+0.6%)
- 100% magazine hit rate (supply from free path working correctly)
Implementation:
- tiny_free_fast_v2.inc.h: Dual-mode supply (lines 134-166)
- tiny_heap_v2.h: Add tiny_heap_v2_leftover_mode() flag + rationale doc
- tiny_alloc_fast.inc.h: Alloc hook with tiny_heap_v2_alloc_by_class()
- CURRENT_TASK.md: Updated Phase 13-B status (complete) with A/B results
ENV flags:
- HAKMEM_TINY_HEAP_V2=1 # Enable TinyHeapV2
- HAKMEM_TINY_HEAP_V2_LEFTOVER_MODE=0 # Mode 0 (Stealing, default)
- HAKMEM_TINY_HEAP_V2_CLASS_MASK=0xE # C1-C3 only (skip C0 -5% regression)
- HAKMEM_TINY_HEAP_V2_STATS=1 # Print statistics
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
2025-11-15 16:28:40 +09:00
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