71 lines
2.7 KiB
Markdown
71 lines
2.7 KiB
Markdown
A data structure for optimistic concurrency control on ranges of bitwise-lexicographically-ordered keys.
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Intended to replace FoundationDB's skip list.
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# FoundationDB's benchmark
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## Skip list
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```
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New conflict set: 4.189 sec
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0.298 Mtransactions/sec
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1.194 Mkeys/sec
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Detect only: 3.990 sec
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0.313 Mtransactions/sec
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1.253 Mkeys/sec
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Skiplist only: 2.849 sec
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0.439 Mtransactions/sec
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1.755 Mkeys/sec
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Performance counters:
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Build: 0.0913
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Add: 0.0998
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Detect: 3.99
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D.Sort: 0.808
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D.Combine: 0.0309
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D.CheckRead: 1.67
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D.CheckIntraBatch: 0.0305
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D.MergeWrite: 1.18
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D.RemoveBefore: 0.265
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```
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## Radix tree (this implementation)
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```
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New conflict set: 2.965 sec
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0.422 Mtransactions/sec
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1.686 Mkeys/sec
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Detect only: 2.761 sec
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0.453 Mtransactions/sec
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1.811 Mkeys/sec
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Skiplist only: 1.580 sec
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0.791 Mtransactions/sec
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3.165 Mkeys/sec
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Performance counters:
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Build: 0.0902
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Add: 0.107
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Detect: 2.76
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D.Sort: 0.809
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D.Combine: 0.0309
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D.CheckRead: 0.658
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D.CheckIntraBatch: 0.0294
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D.MergeWrite: 0.921
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D.RemoveBefore: 0.305
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```
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# Our benchmark
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| ns/op | op/s | err% | total | benchmark
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|--------------------:|--------------------:|--------:|----------:|:----------
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| 263.10 | 3,800,889.33 | 1.6% | 0.64 | `skip list (point reads)`
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| 256.36 | 3,900,800.96 | 1.7% | 0.61 | `skip list (prefix reads)`
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| 526.95 | 1,897,714.85 | 1.6% | 1.23 | `skip list (range reads)`
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| 546.54 | 1,829,676.97 | 0.5% | 1.31 | `skip list (point writes)`
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| 539.23 | 1,854,511.73 | 0.5% | 1.29 | `skip list (prefix writes)`
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| 266.68 | 3,749,799.99 | 0.6% | 0.65 | `skip list (range writes)`
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| 18.31 | 54,612,706.60 | 0.4% | 0.04 | `radix tree (point reads)`
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| 48.78 | 20,498,870.77 | 0.2% | 0.12 | `radix tree (prefix reads)`
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| 347.16 | 2,880,474.86 | 0.9% | 0.83 | `radix tree (range reads)`
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| 34.80 | 28,734,706.67 | 3.6% | 0.09 | `radix tree (point writes)`
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| 70.34 | 14,216,970.16 | 1.4% | 0.17 | `radix tree (prefix writes)`
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| 82.41 | 12,134,555.86 | 1.0% | 0.20 | `radix tree (range writes)`
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