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This commit is contained in:
andrew
2026-07-14 14:32:08 -04:00
parent 7c6c116713
commit 9b7199567b
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@@ -2,7 +2,16 @@ A data structure for optimistic concurrency control on ranges of bitwise-lexicog
Intended as an alternative to FoundationDB's skip list. 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 Hardware for all benchmarks is an AMD Ryzen 9 7900 with (2x32GB) 5600MT/s CL28-34-34-89 1.35V RAM.
```
$ clang++ --version
Ubuntu clang version 21.1.8 (6ubuntu1)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm-21/bin
```
# Microbenchmark # Microbenchmark
@@ -10,44 +19,45 @@ Hardware for all benchmarks is an AMD Ryzen 9 7900 with (2x32GB) 5600MT/s CL28-3
| ns/op | op/s | err% | ins/op | cyc/op | IPC | bra/op | miss% | total | benchmark | 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` | 171.37 | 5,835,467.28 | 0.5% | 2,915.46 | 629.31 | 4.633 | 502.91 | 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` | 168.16 | 5,946,774.62 | 0.5% | 2,859.73 | 619.03 | 4.620 | 488.59 | 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` | 245.86 | 4,067,294.63 | 0.3% | 3,508.97 | 904.82 | 3.878 | 627.73 | 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` | 381.14 | 2,623,691.76 | 0.2% | 5,127.16 | 1,402.60 | 3.655 | 830.59 | 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` | 376.24 | 2,657,887.07 | 0.3% | 5,062.85 | 1,381.07 | 3.666 | 811.68 | 1.6% | 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` | 257.09 | 3,889,688.44 | 3.8% | 3,010.09 | 949.42 | 3.170 | 521.34 | 2.9% | 0.01 | `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` | 629.71 | 1,588,026.28 | 4.0% | 6,809.60 | 2,320.32 | 2.935 | 1,247.08 | 1.3% | 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` | 126,164.50 | 7,926.16 | 1.7% | 772,460.25 | 463,264.67 | 1.667 | 141,512.00 | 0.2% | 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` | 15.33 | 65,217,669.23 | 0.4% | 299.00 | 56.45 | 5.297 | 64.00 | 0.0% | 0.01 | `create and destroy`
## Radix tree (this implementation) ## Radix tree (this implementation)
| ns/op | op/s | err% | ins/op | cyc/op | IPC | bra/op | miss% | total | benchmark | ns/op | op/s | err% | ins/op | cyc/op | IPC | bra/op | miss% | total | benchmark
|--------------------:|--------------------:|--------:|----------------:|----------------:|-------:|---------------:|--------:|----------:|:---------- |--------------------:|--------------------:|--------:|----------------:|----------------:|-------:|---------------:|--------:|----------:|:----------
| 11.18 | 89,455,125.34 | 0.6% | 185.37 | 57.08 | 3.248 | 41.51 | 0.4% | 0.01 | `point reads` | 12.81 | 78,088,759.03 | 0.7% | 187.38 | 47.15 | 3.974 | 33.70 | 0.5% | 0.01 | `point reads`
| 14.53 | 68,800,688.89 | 0.4% | 282.41 | 74.80 | 3.776 | 55.06 | 0.3% | 0.01 | `prefix reads` | 16.77 | 59,626,501.14 | 0.4% | 277.61 | 61.74 | 4.497 | 44.76 | 0.4% | 0.01 | `prefix reads`
| 36.54 | 27,367,576.87 | 0.2% | 798.06 | 188.90 | 4.225 | 141.69 | 0.2% | 0.01 | `range reads` | 42.45 | 23,556,818.87 | 0.4% | 856.96 | 156.09 | 5.490 | 126.22 | 0.2% | 0.01 | `range reads`
| 16.69 | 59,912,106.02 | 0.6% | 314.57 | 86.29 | 3.645 | 39.84 | 0.4% | 0.01 | `point writes` | 15.76 | 63,453,196.94 | 0.3% | 249.89 | 58.04 | 4.306 | 33.21 | 0.5% | 0.01 | `point writes`
| 30.09 | 33,235,744.07 | 0.5% | 591.33 | 155.92 | 3.793 | 82.69 | 0.2% | 0.01 | `prefix writes` | 29.71 | 33,662,499.39 | 0.1% | 509.14 | 109.33 | 4.657 | 70.26 | 0.5% | 0.01 | `prefix writes`
| 35.77 | 27,956,388.03 | 1.4% | 682.25 | 187.63 | 3.636 | 96.12 | 0.1% | 0.01 | `range writes` | 35.77 | 27,956,388.03 | 0.8% | 614.18 | 131.72 | 4.663 | 85.57 | 0.1% | 0.01 | `range writes`
| 74.04 | 13,505,408.41 | 2.7% | 1,448.95 | 392.10 | 3.695 | 260.53 | 0.1% | 0.01 | `monotonic increasing point writes` | 80.13 | 12,480,456.47 | 1.5% | 1,279.04 | 294.90 | 4.337 | 234.68 | 0.1% | 0.01 | `monotonic increasing point writes`
| 330,984.50 | 3,021.29 | 1.9% | 3,994,153.50 | 1,667,309.00 | 2.396 | 806,019.50 | 0.0% | 0.01 | `worst case for radix tree` | 360,748.00 | 2,772.02 | 2.6% | 4,401,835.00 | 1,318,754.00 | 3.338 | 728,537.00 | 0.0% | 0.01 | `worst case for radix tree`
| 92.46 | 10,814,961.65 | 0.5% | 1,800.00 | 463.41 | 3.884 | 297.00 | 0.0% | 0.01 | `create and destroy` | 90.69 | 11,027,103.45 | 1.0% | 1,686.00 | 333.80 | 5.051 | 284.00 | 0.0% | 0.01 | `create and destroy`
# "Real data" test # "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. Point queries only. 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 ## skip list
``` ```
Check: 4.47891 seconds, 364.05 MB/s, Add: 4.55599 seconds, 123.058 MB/s, Gc ratio: 37.1145% Check: 4.42779 seconds, 368.253 MB/s, Add: 4.64942 seconds, 120.586 MB/s, Gc ratio: 28.8784%, Peak idle memory: 5.51735e+06
``` ```
## radix tree ## radix tree
``` ```
Check: 0.953012 seconds, 1710.94 MB/s, Add: 1.30025 seconds, 431.188 MB/s, Gc ratio: 43.9816%, Peak idle memory: 2.28375e+06 Check: 0.891163 seconds, 1829.69 MB/s, Add: 1.23064 seconds, 455.579 MB/s, Gc ratio: 42.9417%, Peak idle memory: 2.28333e+06
``` ```
## hash table ## hash table
@@ -55,5 +65,6 @@ Check: 0.953012 seconds, 1710.94 MB/s, Add: 1.30025 seconds, 431.188 MB/s, Gc ra
(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) (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% Check: 0.858484 seconds, 1899.33 MB/s, Add: 0.632886 seconds, 885.868 MB/s, Gc ratio: 41.252%, Peak idle memory: 0
``` ```