Andrew Noyes
359f6f0042
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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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| 11.04 | 90,614,308.12 | 0.8% | 180.38 | 55.13 | 3.272 | 41.51 | 0.4% | 0.01 | `point reads`
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| 14.96 | 66,843,629.12 | 0.4% | 274.41 | 74.73 | 3.672 | 55.05 | 0.3% | 0.01 | `prefix reads`
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| 37.06 | 26,982,847.61 | 0.2% | 791.04 | 185.28 | 4.269 | 142.67 | 0.2% | 0.01 | `range reads`
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| 17.89 | 55,887,365.73 | 0.6% | 335.54 | 89.79 | 3.737 | 43.84 | 0.4% | 0.01 | `point writes`
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| 31.85 | 31,394,336.65 | 0.3% | 615.32 | 159.63 | 3.855 | 87.69 | 0.2% | 0.01 | `prefix writes`
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| 36.17 | 27,647,221.45 | 0.6% | 705.11 | 182.80 | 3.857 | 100.62 | 0.1% | 0.01 | `range writes`
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| 79.01 | 12,656,457.78 | 0.7% | 1,498.35 | 402.46 | 3.723 | 270.50 | 0.1% | 0.01 | `monotonic increasing point writes`
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| 303,667.50 | 3,293.08 | 1.1% | 3,931,273.00 | 1,612,702.50 | 2.438 | 806,223.33 | 0.0% | 0.01 | `worst case for radix tree`
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| 83.70 | 11,947,443.83 | 0.7% | 1,738.03 | 429.06 | 4.051 | 270.01 | 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: 0.958985 seconds, 1700.28 MB/s, Add: 1.35083 seconds, 415.044 MB/s, Gc ratio: 44.4768%, Peak idle memory: 2.33588e+06
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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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