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f88e51e45b
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Phase 12: Strategic Pause Results - Critical Finding
Completed Strategic Pause investigation with shocking discovery:
- System malloc (glibc ptmalloc2): 86.58M ops/s
- hakmem (Phase 10): 52.88M ops/s
- Gap: **+63.7%** 🚨
Baseline (Phase 10):
- Mean: 51.76M ops/s (10-run, CV 1.03%)
- Health check: PASS
- Perf stat: IPC 2.22, branch miss 2.48%, good cache locality
Allocator comparison:
- hakmem: 52.43M ops/s (RSS: 33.8MB)
- jemalloc: 48.60M ops/s (RSS: 35.6MB) [-7.3%]
- system malloc: 85.96M ops/s [+63.9%] 🚨
Gap analysis (5 hypotheses):
1. Header write overhead (400M writes) - Expected ROI: +10-20%
2. Thread cache implementation (tcache vs TinyUnifiedCache) - Expected ROI: +20-30%
3. Metadata access pattern (indirection overhead) - Expected ROI: +5-10%
4. Classification overhead (LUT + routing) - Expected ROI: +5%
5. Freelist management (header vs chunk placement) - Expected ROI: +5%
Recommendation: Proceed to Phase 13 (Header Write Elimination)
- Most direct overhead (400M writes per 200M iters)
- Measurable with perf
- Clear ROI (+10-20% expected)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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2025-12-14 21:17:48 +09:00 |
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