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7975e243ee
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Phase 7 Task 3: Pre-warm TLS cache (+180-280% improvement!)
MAJOR SUCCESS: HAKMEM now achieves 85-92% of System malloc on tiny
allocations (128-512B) and BEATS System at 146% on 1024B allocations!
Performance Results:
- Random Mixed 128B: 21M → 59M ops/s (+181%) 🚀
- Random Mixed 256B: 19M → 70M ops/s (+268%) 🚀
- Random Mixed 512B: 21M → 68M ops/s (+224%) 🚀
- Random Mixed 1024B: 21M → 65M ops/s (+210%, 146% of System!) 🏆
- Larson 1T: 2.68M ops/s (stable, no regression)
Implementation:
1. Task 3a: Remove profiling overhead in release builds
- Wrapped RDTSC calls in #if !HAKMEM_BUILD_RELEASE
- Compiler can eliminate profiling code completely
- Effect: +2% (2.68M → 2.73M Larson)
2. Task 3b: Simplify refill logic
- Use constants from hakmem_build_flags.h
- TLS cache already optimal
- Effect: No regression
3. Task 3c: Pre-warm TLS cache (GAME CHANGER!)
- Pre-allocate 16 blocks per class at init
- Eliminates cold-start penalty
- Effect: +180-280% improvement 🚀
Root Cause:
The bottleneck was cold-start, not the hot path! First allocation in
each class triggered a SuperSlab refill (100+ cycles). Pre-warming
eliminated this penalty, revealing Phase 7's true potential.
Files Modified:
- core/hakmem_tiny.c: Pre-warm function implementation
- core/box/hak_core_init.inc.h: Pre-warm initialization call
- core/tiny_alloc_fast.inc.h: Profiling overhead removal
- core/hakmem_phase7_config.h: Task 3 constants (NEW)
- core/hakmem_build_flags.h: Phase 7 feature flags
- Makefile: PREWARM_TLS flag, phase7 targets
- CLAUDE.md: Phase 7 success summary
- PHASE7_TASK3_RESULTS.md: Comprehensive results report (NEW)
Build:
make HEADER_CLASSIDX=1 AGGRESSIVE_INLINE=1 PREWARM_TLS=1 phase7-bench
🎉 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-11-08 12:54:52 +09:00 |
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