Andrew Noyes
70e3377eac
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Tests / Release [gcc] total: 471, passed: 471
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Reference build: <a href="https://jenkins.weaselab.dev/job/weaselab/job/conflict-set/job/main/37//gcc">weaselab » conflict-set » main #37</a>
Tests / Coverage total: 469, passed: 469
weaselab/conflict-set/pipeline/head This commit looks good
Don't try to make sense of the diff - the benchmark itself changed too
72 lines
2.9 KiB
Markdown
72 lines
2.9 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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| 325.60 | 3,071,225.77 | 4.8% | 0.77 | `skip list (point reads)`
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| 297.15 | 3,365,278.10 | 1.7% | 0.72 | `skip list (prefix reads)`
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| 408.79 | 2,446,222.23 | 1.0% | 1.03 | `skip list (range reads)`
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| 261.88 | 3,818,471.08 | 1.3% | 0.73 | `skip list (point writes)`
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| 253.54 | 3,944,191.08 | 0.1% | 0.61 | `skip list (prefix writes)`
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| 258.73 | 3,865,078.52 | 0.8% | 0.62 | `skip list (range writes)`
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| 489.56 | 2,042,648.19 | 1.8% | 0.01 | `skip list (monotonic increasing point writes)`
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| 14.83 | 67,446,579.75 | 0.1% | 0.04 | `radix tree (point reads)`
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| 59.68 | 16,756,917.37 | 0.1% | 0.14 | `radix tree (prefix reads)`
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| 287.32 | 3,480,485.22 | 1.2% | 0.69 | `radix tree (range reads)`
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| 46.59 | 21,461,855.59 | 0.2% | 0.12 | `radix tree (point writes)`
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| 83.70 | 11,946,755.99 | 0.1% | 0.20 | `radix tree (prefix writes)`
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| 100.75 | 9,925,723.26 | 0.6% | 0.25 | `radix tree (range writes)`
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| 118.37 | 8,448,345.29 | 0.6% | 0.01 | `radix tree (monotonic increasing point writes)` |