Andrew Noyes
0a850f22e9
All checks were successful
Tests / Clang total: 2264, passed: 2264
Clang |Total|New|Outstanding|Fixed|Trend
|:-:|:-:|:-:|:-:|:-:
|0|0|0|0|:clap:
Tests / Debug total: 2262, passed: 2262
Tests / SIMD fallback total: 2264, passed: 2264
Tests / Release [gcc] total: 2264, passed: 2264
GNU C Compiler (gcc) |Total|New|Outstanding|Fixed|Trend
|:-:|:-:|:-:|:-:|:-:
|0|0|0|0|:clap:
Tests / Release [gcc,aarch64] total: 1690, passed: 1690
Tests / Coverage total: 1700, passed: 1700
Code Coverage #### Project Overview
No changes detected, that affect the code coverage.
* Line Coverage: 99.34% (1809/1821)
* Branch Coverage: 67.61% (1476/2183)
* Complexity Density: 0.00
* Lines of Code: 1821
#### Quality Gates Summary
Output truncated.
weaselab/conflict-set/pipeline/head This commit looks good
61 lines
4.4 KiB
Markdown
61 lines
4.4 KiB
Markdown
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
|
|
|--------------------:|--------------------:|--------:|----------------:|----------------:|-------:|---------------:|--------:|----------:|:----------
|
|
| 10.80 | 92,600,541.52 | 0.6% | 180.38 | 54.49 | 3.310 | 41.51 | 0.4% | 0.01 | `point reads`
|
|
| 15.00 | 66,687,691.68 | 0.4% | 278.44 | 76.44 | 3.642 | 55.56 | 0.3% | 0.01 | `prefix reads`
|
|
| 36.81 | 27,163,394.61 | 0.4% | 795.06 | 187.91 | 4.231 | 142.67 | 0.2% | 0.01 | `range reads`
|
|
| 18.14 | 55,137,674.01 | 1.2% | 338.19 | 92.86 | 3.642 | 42.81 | 0.4% | 0.01 | `point writes`
|
|
| 33.19 | 30,127,119.71 | 0.1% | 681.03 | 170.05 | 4.005 | 98.68 | 0.2% | 0.01 | `prefix writes`
|
|
| 37.37 | 26,759,432.70 | 1.9% | 779.70 | 195.45 | 3.989 | 114.21 | 0.0% | 0.01 | `range writes`
|
|
| 74.36 | 13,448,582.47 | 1.9% | 1,425.68 | 389.08 | 3.664 | 258.88 | 0.1% | 0.01 | `monotonic increasing point writes`
|
|
| 316,928.00 | 3,155.29 | 1.5% | 3,992,986.00 | 1,699,813.00 | 2.349 | 806,226.50 | 0.0% | 0.01 | `worst case for radix tree`
|
|
| 75.26 | 13,286,517.16 | 0.5% | 1,590.01 | 386.67 | 4.112 | 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: 0.910234 seconds, 1791.35 MB/s, Add: 1.25908 seconds, 445.287 MB/s, Gc ratio: 44.0415%
|
|
```
|
|
|
|
## 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%
|
|
```
|