cachekit 0.7.0

High-performance cache primitives with pluggable eviction policies (LRU, LFU, FIFO, 2Q, Clock-PRO, S3-FIFO) and optional metrics.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142

# Benchmark Results

**Quick Links**: [📊 Interactive Charts](charts.html) | [📁 Raw JSON](results.json)

---

## Environment

- **Date**: 2026-03-31T11:16:20.376961007+00:00
- **Commit**: `860f36d607fe3953f7d289d1efeae7a55e3dd0f5`
- **Branch**: `HEAD`
- **Dirty**: false
- **Rustc**: rustc 1.94.1 (e408947bf 2026-03-25)
- **Host**: x86_64-unknown-linux-gnu
- **CPU**: Intel(R) Xeon(R) Platinum 8370C CPU @ 2.80GHz

## Configuration

- **Capacity**: 4096
- **Universe**: 16384
- **Operations**: 200000
- **Seed**: 42

## Hit Rate Comparison

| Policy | Flash Crowd | HotSet 90/10 | Latest | Scan | Scan Resistance | Scrambled Zipfian | Uniform | Zipfian 1.0 |
|--------|-------:|-------:|-------:|-------:|-------:|-------:|-------:|-------:|
| **2Q** | 89.36% | 90.63% | 31.55% | 0.00% | 16.04% | 90.71% | 24.78% | 82.37% |
| **Clock** | 88.74% | 90.65% | 34.96% | 0.00% | 17.63% | 90.45% | 24.66% | 80.75% |
| **Clock-Pro** | 89.14% | 90.65% | 30.55% | 0.00% | 21.09% | 90.38% | 24.77% | 81.54% |
| **FIFO** | 86.74% | 86.16% | 35.49% | 0.00% | 15.58% | 87.58% | 24.64% | 76.77% |
| **Heap-LFU** | 85.32% | 90.67% | 26.51% | 22.52% | 23.42% | 90.03% | 24.67% | 74.81% |
| **LFU** | 89.40% | 90.64% | 25.82% | 0.00% | 20.28% | 91.13% | 24.61% | 82.57% |
| **LIFO** | 63.08% | 90.66% | 26.08% | 24.22% | 29.10% | 90.18% | 24.76% | 80.25% |
| **LRU** | 88.50% | 90.65% | 35.45% | 0.00% | 16.75% | 90.22% | 24.62% | 80.17% |
| **LRU-K** | 89.40% | 90.64% | 25.91% | 0.00% | 20.28% | 91.13% | 24.61% | 82.57% |
| **MFU** | 41.69% | 37.18% | 24.89% | 18.44% | 23.42% | 59.85% | 24.66% | 31.99% |
| **MRU** | 39.71% | 38.07% | 24.90% | 24.22% | 28.90% | 59.53% | 24.74% | 33.10% |
| **NRU** | 88.17% | 90.66% | 26.35% | 24.21% | 29.10% | 90.20% | 24.74% | 80.29% |
| **Random** | 86.84% | 86.34% | 32.85% | 1.82% | 20.72% | 87.70% | 24.66% | 76.98% |
| **S3-FIFO** | 89.48% | 90.63% | 30.35% | 0.00% | 23.18% | 90.95% | 24.73% | 82.49% |
| **SLRU** | 89.40% | 90.63% | 30.95% | 0.00% | 16.92% | 90.89% | 24.75% | 82.57% |

## Throughput (Million ops/sec)

| Policy | HotSet 90/10 | Uniform | Zipfian 1.0 |
|--------|-------:|-------:|-------:|
| **2Q** | 12.99 | 17.99 | 8.86 |
| **Clock** | 13.94 | 18.09 | 9.24 |
| **Clock-Pro** | 13.00 | 10.19 | 8.21 |
| **FIFO** | 11.71 | 11.81 | 7.97 |
| **Heap-LFU** | 8.11 | 7.62 | 6.02 |
| **LFU** | 8.07 | 8.53 | 5.63 |
| **LIFO** | 15.54 | 21.60 | 9.96 |
| **LRU** | 11.88 | 17.29 | 8.58 |
| **LRU-K** | 12.12 | 13.31 | 8.30 |
| **MFU** | 10.29 | 11.25 | 7.94 |
| **MRU** | 16.21 | 18.85 | 11.43 |
| **NRU** | 13.71 | 0.62 | 7.18 |
| **Random** | 15.18 | 17.70 | 9.71 |
| **S3-FIFO** | 12.79 | 12.35 | 8.35 |
| **SLRU** | 13.09 | 17.63 | 8.90 |

## Latency P99 (nanoseconds)

| Policy | HotSet 90/10 | Uniform | Zipfian 1.0 |
|--------|-------:|-------:|-------:|
| **2Q** | 76 | 133 | 98 |
| **Clock** | 91 | 131 | 120 |
| **Clock-Pro** | 219 | 359 | 313 |
| **FIFO** | 170 | 210 | 194 |
| **Heap-LFU** | 284 | 355 | 309 |
| **LFU** | 188 | 389 | 219 |
| **LIFO** | 60 | 90 | 76 |
| **LRU** | 88 | 123 | 109 |
| **LRU-K** | 129 | 196 | 147 |
| **MFU** | 187 | 214 | 208 |
| **MRU** | 96 | 129 | 101 |
| **NRU** | 199 | 11535 | 590 |
| **Random** | 93 | 126 | 108 |
| **S3-FIFO** | 142 | 243 | 188 |
| **SLRU** | 73 | 136 | 103 |

## Scan Resistance

| Policy | Baseline | During Scan | Recovery | Score |
|--------|----------|-------------|----------|-------|
| **2Q** | 79.66% | 7.69% | 78.54% | 0.986 |
| **Clock** | 79.66% | 6.90% | 68.54% | 0.860 |
| **Clock-Pro** | 79.66% | 7.69% | 78.78% | 0.989 |
| **FIFO** | 78.36% | 9.22% | 68.55% | 0.875 |
| **Heap-LFU** | 79.21% | 21.89% | 75.79% | 0.957 |
| **LFU** | 79.66% | 7.69% | 78.54% | 0.986 |
| **LIFO** | 79.75% | 19.48% | 80.80% | 1.013 |
| **LRU** | 79.65% | 7.03% | 68.54% | 0.861 |
| **LRU-K** | 79.66% | 7.69% | 78.54% | 0.986 |
| **MFU** | 75.51% | 20.18% | 32.87% | 0.435 |
| **MRU** | 74.88% | 20.67% | 46.96% | 0.627 |
| **NRU** | 79.75% | 19.48% | 80.86% | 1.014 |
| **Random** | 79.55% | 11.72% | 68.53% | 0.861 |
| **S3-FIFO** | 79.66% | 7.69% | 78.82% | 0.989 |
| **SLRU** | 79.66% | 7.69% | 78.54% | 0.986 |

*Score = Recovery/Baseline (1.0 = perfect recovery)*

## Adaptation Speed

| Policy | Stable Hit Rate | Ops to 50% | Ops to 80% |
|--------|-----------------|------------|------------|
| **2Q** | 33.50% | 3072 | 11264 |
| **Clock** | 49.32% | 3072 | 6144 |
| **Clock-Pro** | 36.04% | 8192 | 11264 |
| **FIFO** | 52.25% | 3072 | 6144 |
| **Heap-LFU** | 9.86% | 2048 | 2048 |
| **LFU** | 9.08% | 1024 | 2048 |
| **LIFO** | 0.20% | 5120 | 16384 |
| **LRU** | 49.32% | 3072 | 5120 |
| **LRU-K** | 9.08% | 1024 | 2048 |
| **MFU** | 3.71% | 1024 | 2048 |
| **MRU** | 0.20% | 5120 | 16384 |
| **NRU** | 0.20% | 5120 | 16384 |
| **Random** | 45.02% | 4096 | 8192 |
| **S3-FIFO** | 46.48% | 8192 | 11264 |
| **SLRU** | 27.73% | 3072 | 11264 |

*Lower ops-to-X% is better (faster adaptation)*

## Policy Selection Guide

| Use Case | Recommended Policy | Why |
|----------|-------------------|-----|
| **General purpose, skewed workloads** | LRU, LFU, S3-FIFO | Best hit rates on Zipfian/skewed patterns |
| **Scan-heavy workloads** | S3-FIFO, Heap-LFU | Scan-resistant, protect hot entries |
| **Low latency required** | LRU, Clock | Fastest operations, O(1) overhead |
| **Memory constrained** | LRU, Clock | Minimal metadata overhead |
| **Frequency-aware** | LFU, Heap-LFU, LRU-K | Track access frequency for better decisions |
| **Shifting patterns** | S3-FIFO, 2Q | Adapt to changing access patterns |
| **Multi-access patterns** | 2Q, S3-FIFO | Handle mixed one-hit and frequent items |

---

*Generated from `results.json` (schema v1.0.0)*