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b2724e6f5d
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Phase ALLOC-TINY-FAST-DUALHOT-1: WIP (regression), FREE DUALHOT confirmed +13%
**ALLOC-TINY-FAST-DUALHOT-1** (this phase):
- Implementation: malloc_tiny_fast() C0-C3 early-exit with policy snapshot skip
- ENV: HAKMEM_TINY_ALLOC_DUALHOT=0/1 (default OFF)
- A/B Result: -1.17% median regression (Mixed, 10-run)
- Root Cause: Branch prediction penalty on C4-C7 outweighs policy skip benefit
- Decision: Freeze as research box (default OFF)
- Difference from FREE: ALLOC requires structural changes (per-class paths)
**FREE-TINY-FAST-DUALHOT-1** (verified):
- A/B Confirmation: +13.00% improvement (42.08M → 47.81M ops/s, Mixed, 10-run)
- Success Criteria: +2% target ACHIEVED
- Health Check: PASS (verify_health_profiles.sh, ENV OFF/ON)
- Safety: HAKMEM_TINY_LARSON_FIX guard in place
- Decision: Promotion to MIXED_TINYV3_C7_SAFE profile candidate
**Next Steps**:
- Profile adoption of FREE DUALHOT for MIXED workload
- No further deep-dive on ALLOC optimization (deferred to future phases)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-12-13 05:10:45 +09:00 |
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0a7400d7d3
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Phase ALLOC-TINY-FAST-DUALHOT-1: C0-C3 alloc direct path (WIP, -2% regression)
Add C0-C3 early-exit optimization to malloc_tiny_fast() similar to
FREE-TINY-FAST-DUALHOT-1. Skip policy snapshot for C0-C3 classes.
A/B Result (10-run, Mixed TINYV3_C7_SAFE):
- Baseline: 47.27M ops/s (median)
- Optimized: 46.10M ops/s (median)
- Result: -2.00% (regression, needs investigation)
ENV: HAKMEM_TINY_ALLOC_DUALHOT=0/1 (default OFF)
Implementation:
- core/front/malloc_tiny_fast.h: alloc_dualhot_enabled() + early-exit
- Design: docs/analysis/ALLOC_TINY_FAST_DUALHOT_1_DESIGN.md
Status: Research box (default OFF), needs root cause analysis
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-12-13 04:28:52 +09:00 |
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