Andrew Noyes
e6c39981b9
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Tests / Clang total: 1420, passed: 1420
Clang |Total|New|Outstanding|Fixed|Trend
|:-:|:-:|:-:|:-:|:-:
|0|0|0|0|:clap:
Tests / Debug total: 1418, passed: 1418
Tests / SIMD fallback total: 1420, passed: 1420
Tests / Release [gcc] total: 1420, passed: 1420
GNU C Compiler (gcc) |Total|New|Outstanding|Fixed|Trend
|:-:|:-:|:-:|:-:|:-:
|0|0|0|0|:clap:
Tests / Release [gcc,aarch64] total: 1057, passed: 1057
Tests / Coverage total: 1067, passed: 1067
Code Coverage #### Project Overview
No changes detected, that affect the code coverage.
* Line Coverage: 99.34% (1817/1829)
* Branch Coverage: 67.49% (1503/2227)
* Complexity Density: 0.00
* Lines of Code: 1829
#### Quality Gates Summary
Output truncated.
weaselab/conflict-set/pipeline/head This commit looks good
A data structure for optimistic concurrency control on ranges of bitwise-lexicographically-ordered keys.
Intended as an alternative to FoundationDB's skip list.
Hardware for all benchmarks is an AMD Ryzen 9 7900 with (2x32GB) 5600MT/s CL28-34-34-89 1.35V RAM
Microbenchmark
Skip list
| ns/op | op/s | err% | ins/op | cyc/op | IPC | bra/op | miss% | total | benchmark |
|---|---|---|---|---|---|---|---|---|---|
| 172.03 | 5,812,791.77 | 0.4% | 3,130.62 | 879.00 | 3.562 | 509.23 | 0.0% | 0.01 | point reads |
| 167.44 | 5,972,130.71 | 0.2% | 3,065.14 | 862.27 | 3.555 | 494.30 | 0.0% | 0.01 | prefix reads |
| 238.77 | 4,188,130.84 | 0.9% | 3,589.93 | 1,259.30 | 2.851 | 637.12 | 0.0% | 0.01 | range reads |
| 424.01 | 2,358,426.70 | 0.2% | 5,620.05 | 2,242.35 | 2.506 | 854.80 | 1.7% | 0.01 | point writes |
| 418.45 | 2,389,780.56 | 0.4% | 5,525.07 | 2,211.05 | 2.499 | 831.71 | 1.7% | 0.01 | prefix writes |
| 254.87 | 3,923,568.88 | 2.6% | 3,187.01 | 1,366.50 | 2.332 | 529.11 | 2.7% | 0.02 | range writes |
| 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 |
| 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 |
| 21.63 | 46,231,564.03 | 1.0% | 448.00 | 107.14 | 4.181 | 84.00 | 0.0% | 0.01 | create and destroy |
Radix tree (this implementation)
| ns/op | op/s | err% | ins/op | cyc/op | IPC | bra/op | miss% | total | benchmark |
|---|---|---|---|---|---|---|---|---|---|
| 12.42 | 80,500,398.66 | 0.8% | 180.38 | 61.57 | 2.930 | 41.51 | 0.4% | 0.01 | point reads |
| 15.17 | 65,917,580.99 | 0.2% | 279.47 | 74.95 | 3.729 | 55.54 | 0.3% | 0.01 | prefix reads |
| 38.16 | 26,202,393.91 | 0.1% | 803.07 | 189.13 | 4.246 | 141.68 | 0.2% | 0.01 | range reads |
| 20.20 | 49,504,615.44 | 0.4% | 363.00 | 100.35 | 3.617 | 49.81 | 0.3% | 0.01 | point writes |
| 41.99 | 23,816,559.99 | 0.3% | 799.27 | 209.63 | 3.813 | 154.32 | 0.1% | 0.01 | prefix writes |
| 46.28 | 21,607,605.88 | 1.5% | 953.79 | 231.47 | 4.121 | 168.34 | 0.0% | 0.01 | range writes |
| 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 |
| 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 |
| 75.85 | 13,183,612.56 | 0.5% | 1,590.01 | 385.64 | 4.123 | 258.00 | 0.0% | 0.01 | create and destroy |
"Real data" test
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.
skip list
Check: 4.47891 seconds, 364.05 MB/s, Add: 4.55599 seconds, 123.058 MB/s, Gc ratio: 37.1145%
radix tree
Check: 0.963721 seconds, 1691.93 MB/s, Add: 1.3288 seconds, 421.924 MB/s, Gc ratio: 42.8819%
hash table
(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)
Check: 0.804094 seconds, 2027.81 MB/s, Add: 0.652952 seconds, 858.645 MB/s, Gc ratio: 35.3885%