Andrew Noyes
6da9cbdec9
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Code Coverage #### Project Overview
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* Line Coverage: 98.00% (1812/1849)
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60 lines
4.4 KiB
Markdown
60 lines
4.4 KiB
Markdown
A data structure for optimistic concurrency control on ranges of bitwise-lexicographically-ordered keys.
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Intended as an alternative to FoundationDB's skip list.
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Hardware for all benchmarks is an AMD Ryzen 9 7900 with (2x32GB) 5600MT/s CL28-34-34-89 1.35V RAM
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# Microbenchmark
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## Skip list
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| ns/op | op/s | err% | ins/op | cyc/op | IPC | bra/op | miss% | total | benchmark
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|--------------------:|--------------------:|--------:|----------------:|----------------:|-------:|---------------:|--------:|----------:|:----------
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| 172.03 | 5,812,791.77 | 0.4% | 3,130.62 | 879.00 | 3.562 | 509.23 | 0.0% | 0.01 | `point reads`
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| 167.44 | 5,972,130.71 | 0.2% | 3,065.14 | 862.27 | 3.555 | 494.30 | 0.0% | 0.01 | `prefix reads`
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| 238.77 | 4,188,130.84 | 0.9% | 3,589.93 | 1,259.30 | 2.851 | 637.12 | 0.0% | 0.01 | `range reads`
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| 424.01 | 2,358,426.70 | 0.2% | 5,620.05 | 2,242.35 | 2.506 | 854.80 | 1.7% | 0.01 | `point writes`
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| 418.45 | 2,389,780.56 | 0.4% | 5,525.07 | 2,211.05 | 2.499 | 831.71 | 1.7% | 0.01 | `prefix writes`
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| 254.87 | 3,923,568.88 | 2.6% | 3,187.01 | 1,366.50 | 2.332 | 529.11 | 2.7% | 0.02 | `range writes`
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| 675.96 | 1,479,374.50 | 3.3% | 7,735.41 | 3,468.60 | 2.230 | 1,386.02 | 1.8% | 0.01 | `monotonic increasing point writes`
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| 137,986.20 | 7,247.10 | 0.6% | 789,752.33 | 699,462.00 | 1.129 | 144,824.14 | 0.0% | 0.01 | `worst case for radix tree`
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| 21.63 | 46,231,564.03 | 1.0% | 448.00 | 107.14 | 4.181 | 84.00 | 0.0% | 0.01 | `create and destroy`
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## Radix tree (this implementation)
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| ns/op | op/s | err% | ins/op | cyc/op | IPC | bra/op | miss% | total | benchmark
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|--------------------:|--------------------:|--------:|----------------:|----------------:|-------:|---------------:|--------:|----------:|:----------
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| 12.42 | 80,500,398.66 | 0.8% | 180.38 | 61.57 | 2.930 | 41.51 | 0.4% | 0.01 | `point reads`
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| 15.17 | 65,917,580.99 | 0.2% | 279.47 | 74.95 | 3.729 | 55.54 | 0.3% | 0.01 | `prefix reads`
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| 38.16 | 26,202,393.91 | 0.1% | 803.07 | 189.13 | 4.246 | 141.68 | 0.2% | 0.01 | `range reads`
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| 20.20 | 49,504,615.44 | 0.4% | 363.00 | 100.35 | 3.617 | 49.81 | 0.3% | 0.01 | `point writes`
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| 41.99 | 23,816,559.99 | 0.3% | 799.27 | 209.63 | 3.813 | 154.32 | 0.1% | 0.01 | `prefix writes`
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| 46.28 | 21,607,605.88 | 1.5% | 953.79 | 231.47 | 4.121 | 168.34 | 0.0% | 0.01 | `range writes`
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| 80.99 | 12,347,449.98 | 0.9% | 1,501.97 | 406.50 | 3.695 | 281.89 | 0.1% | 0.01 | `monotonic increasing point writes`
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| 318,010.00 | 3,144.56 | 1.0% | 3,994,511.50 | 1,657,831.50 | 2.409 | 805,969.50 | 0.0% | 0.01 | `worst case for radix tree`
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| 75.85 | 13,183,612.56 | 0.5% | 1,590.01 | 385.64 | 4.123 | 258.00 | 0.0% | 0.01 | `create and destroy`
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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: 4.47891 seconds, 364.05 MB/s, Add: 4.55599 seconds, 123.058 MB/s, Gc ratio: 37.1145%
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```
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## radix tree
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```
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Check: 0.963721 seconds, 1691.93 MB/s, Add: 1.3288 seconds, 421.924 MB/s, Gc ratio: 42.8819%
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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: 0.804094 seconds, 2027.81 MB/s, Add: 0.652952 seconds, 858.645 MB/s, Gc ratio: 35.3885%
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```
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