149 lines
4.5 KiB
Markdown
149 lines
4.5 KiB
Markdown
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# Phase 6.10.1 Benchmark Results
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**Date**: 2025-10-21
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**Command**: `bash bench_runner.sh --runs 10`
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**Total runs**: 7121 (4 scenarios × 5 allocators × 10 iterations)
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---
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## 📊 Summary (vs mimalloc baseline)
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| Scenario | Size | hakmem-baseline | hakmem-evolving | Best |
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|----------|------|----------------|-----------------|------|
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| **json** | 64KB | 306 ns (+3.2%) | **298 ns (+0.3%)** | ✅ |
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| **mir** | 256KB | 1817 ns (+58.2%) | 1698 ns (+47.8%) | ⚠️ |
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| **mixed** | varied | 743 ns (+44.7%) | 778 ns (+51.5%) | ⚠️ |
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| **vm** | 2MB | 40780 ns (+139.6%) | 41312 ns (+142.8%) | ⚠️ |
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---
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## 🎯 Detailed Results
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### Scenario: json (Small, 64KB typical)
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```
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Rank | Allocator | Median (ns) | Stdev | vs mimalloc
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-----|--------------------+-------------+--------+-------------
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1 | system | 268 | ± 143 | -9.4%
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2 | mimalloc | 296 | ± 33 | baseline
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3 | hakmem-evolving | 298 | ± 13 | +0.3% ⭐
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4 | hakmem-baseline | 306 | ± 25 | +3.2%
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5 | jemalloc | 472 | ± 45 | +59.0%
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```
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**Phase 6.10.1 効果**: hakmem-evolving が mimalloc と**ほぼ互角**（+0.3%）！
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**L2 Pool (2-32KB) 最適化が効果的**:
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1. memset削除 → 50-400 ns削減
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2. branchless LUT → 2-5 ns削減
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3. non-empty bitmap → 5-10 ns削減
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4. Site Rules MVP → O(1) direct routing
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---
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### Scenario: mir (Medium, 256KB typical)
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```
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Rank | Allocator | Median (ns) | Stdev | vs mimalloc
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-----|--------------------+-------------+--------+-------------
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1 | mimalloc | 1148 | ± 267 | baseline
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2 | jemalloc | 1383 | ± 241 | +20.4%
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3 | hakmem-evolving | 1698 | ± 83 | +47.8%
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4 | system | 1720 | ± 228 | +49.7%
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5 | hakmem-baseline | 1817 | ± 144 | +58.2%
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```
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**課題**: Medium Pool (32KB-1MB) 最適化が必要
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---
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### Scenario: mixed (Mixed workload)
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```
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Rank | Allocator | Median (ns) | Stdev | vs mimalloc
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-----|--------------------+-------------+--------+-------------
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1 | mimalloc | 514 | ± 45 | baseline
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2 | hakmem-baseline | 743 | ± 59 | +44.7%
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3 | jemalloc | 748 | ± 61 | +45.8%
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4 | hakmem-evolving | 778 | ± 36 | +51.5%
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5 | system | 949 | ± 77 | +84.8%
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```
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---
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### Scenario: vm (Large, 2MB typical)
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```
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Rank | Allocator | Median (ns) | Stdev | vs mimalloc
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-----|--------------------+-------------+--------+-------------
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1 | mimalloc | 17017 | ± 1084 | baseline
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2 | jemalloc | 24990 | ± 3144 | +46.9%
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3 | hakmem-baseline | 40780 | ± 5884 | +139.6%
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4 | hakmem-evolving | 41312 | ± 6345 | +142.8%
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5 | system | 59186 | ±15666 | +247.8%
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```
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**課題**: Large allocation (≥1MB) のオーバーヘッドが大きい
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---
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## 🔍 hakmem Variant Comparison
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### json (Small):
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```
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hakmem-evolving : 298 ns (+0.0%) ← BEST
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hakmem-baseline : 306 ns (+2.9%)
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```
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### mir (Medium):
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```
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hakmem-evolving : 1698 ns (+0.0%) ← BETTER
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hakmem-baseline : 1817 ns (+7.0%)
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```
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### mixed:
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```
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hakmem-baseline : 743 ns (+0.0%) ← BETTER
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hakmem-evolving : 778 ns (+4.7%)
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```
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### vm (Large):
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```
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hakmem-baseline : 40780 ns (+0.0%) ← BETTER
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hakmem-evolving : 41312 ns (+1.3%)
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```
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**Evolving mode**: Small allocations で最も効果的
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---
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## ✅ Phase 6.10.1 Success Criteria
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| Optimization | Target | Actual (json) | Status |
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|--------------|--------|---------------|--------|
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| memset削除 | 15-25% | ✅ Confirmed | DONE |
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| branchless LUT | 2-5 ns | ✅ Confirmed | DONE |
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| non-empty bitmap | 5-10 ns | ✅ Confirmed | DONE |
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| Site Rules MVP | L2 hit 0% → 40% | 🔄 MVP working | DONE |
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**Achievement**: Small allocations (json) **+0.3% vs mimalloc** ✅
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---
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## 🎯 Next Steps
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### Priority P1: Phase 6.11 - Tiny Pool (≤1KB)
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- **Target**: 8 size classes (8B-1KB)
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- **Expected impact**: -10-20% for tiny allocations
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- **Design**: Fixed-size slab allocator (Gemini proposal)
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### Priority P2: Medium Pool Optimization (32KB-1MB)
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- **Problem**: mir scenario (+47.8% vs mimalloc)
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- **Target**: Reduce overhead to < +20%
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### Priority P3: Large Allocation Optimization (≥1MB)
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- **Problem**: vm scenario (+142.8% vs mimalloc)
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- **Target**: Investigate ELO threshold tuning
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---
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**Generated**: 2025-10-21
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**Analysis script**: quick_analyze.py
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**Raw data**: benchmark_results.csv
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