Andrew Noyes
34cd210907
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Tests / Clang total: 1337, passed: 1337
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Tests / Release [gcc,aarch64] total: 997, passed: 997
Tests / Coverage total: 1004, passed: 1004
Code Coverage #### Project Overview
No changes detected, that affect the code coverage.
* Line Coverage: 98.71% (1606/1627)
* Branch Coverage: 65.58% (1471/2243)
* Complexity Density: 0.00
* Lines of Code: 1627
#### Quality Gates Summary
Output truncated.
weaselab/conflict-set/pipeline/head This commit looks good
108 lines
3.8 KiB
Markdown
108 lines
3.8 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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Hardware for all benchmarks is a mac m1 2020.
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# FoundationDB's benchmark
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## Skip list
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```
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New conflict set: 1.957 sec
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0.639 Mtransactions/sec
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2.555 Mkeys/sec
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Detect only: 1.845 sec
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0.678 Mtransactions/sec
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2.710 Mkeys/sec
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Skiplist only: 1.263 sec
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0.990 Mtransactions/sec
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3.960 Mkeys/sec
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Performance counters:
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Build: 0.0546
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Add: 0.0563
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Detect: 1.84
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D.Sort: 0.412
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D.Combine: 0.0141
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D.CheckRead: 0.671
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D.CheckIntraBatch: 0.0068
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D.MergeWrite: 0.592
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D.RemoveBefore: 0.146
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```
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## Radix tree (this implementation)
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```
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New conflict set: 1.366 sec
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0.915 Mtransactions/sec
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3.660 Mkeys/sec
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Detect only: 1.248 sec
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1.002 Mtransactions/sec
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4.007 Mkeys/sec
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Skiplist only: 0.573 sec
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2.182 Mtransactions/sec
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8.730 Mkeys/sec
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Performance counters:
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Build: 0.0594
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Add: 0.0572
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Detect: 1.25
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D.Sort: 0.418
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D.Combine: 0.0149
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D.CheckRead: 0.232
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D.CheckIntraBatch: 0.0067
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D.MergeWrite: 0.341
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D.RemoveBefore: 0.232
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```
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# Our benchmark
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## Skip list
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| ns/op | op/s | err% | total | benchmark
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|--------------------:|--------------------:|--------:|----------:|:----------
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| 245.99 | 4,065,232.81 | 0.3% | 0.01 | `point reads`
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| 265.93 | 3,760,430.49 | 0.2% | 0.01 | `prefix reads`
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| 485.30 | 2,060,569.50 | 0.2% | 0.01 | `range reads`
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| 449.60 | 2,224,195.17 | 0.4% | 0.01 | `point writes`
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| 441.76 | 2,263,688.18 | 1.1% | 0.01 | `prefix writes`
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| 245.42 | 4,074,647.54 | 2.4% | 0.02 | `range writes`
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| 572.80 | 1,745,810.06 | 1.3% | 0.01 | `monotonic increasing point writes`
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| 154,819.33 | 6,459.14 | 0.9% | 0.01 | `worst case for radix tree`
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## Radix tree (this implementation)
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| ns/op | op/s | err% | total | benchmark
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|--------------------:|--------------------:|--------:|----------:|:----------
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| 19.17 | 52,163,930.66 | 0.1% | 0.01 | `point reads`
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| 23.68 | 42,224,388.21 | 0.7% | 0.01 | `prefix reads`
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| 63.30 | 15,797,506.06 | 0.9% | 0.01 | `range reads`
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| 29.66 | 33,720,994.74 | 0.3% | 0.01 | `point writes`
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| 43.50 | 22,987,781.25 | 1.0% | 0.01 | `prefix writes`
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| 50.00 | 20,000,000.00 | 0.8% | 0.01 | `range writes`
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| 103.25 | 9,684,786.47 | 2.9% | 0.01 | `monotonic increasing point writes`
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| 1,181,500.00 | 846.38 | 2.3% | 0.01 | `worst case for radix tree`
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# "Real data" test
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Point queries only, best of three runs. Gc ratio is the ratio of time spent doing garbage collection to time spent adding writes or doing garbage collection. Lower is better.
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## skip list
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```
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Check: 11.3385 seconds, 329.718 MB/s, Add: 5.35612 seconds, 131.072 MB/s, Gc ratio: 45.7173%
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```
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## radix tree
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```
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Check: 2.48583 seconds, 1503.93 MB/s, Add: 2.12768 seconds, 329.954 MB/s, Gc ratio: 41.7943%
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```
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## hash table
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(The hash table implementation doesn't work on range queries, and its purpose is to provide an idea of how fast point queries can be)
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```
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Check: 1.83386 seconds, 2038.6 MB/s, Add: 0.601411 seconds, 1167.32 MB/s, Gc ratio: 48.9776%
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```
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