diff --git a/README.md b/README.md index b2c5f8e..9bec6d9 100644 --- a/README.md +++ b/README.md @@ -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. -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 @@ -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 |--------------------:|--------------------:|--------:|----------------:|----------------:|-------:|---------------:|--------:|----------:|:---------- -| 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` +| 171.37 | 5,835,467.28 | 0.5% | 2,915.46 | 629.31 | 4.633 | 502.91 | 0.0% | 0.01 | `point reads` +| 168.16 | 5,946,774.62 | 0.5% | 2,859.73 | 619.03 | 4.620 | 488.59 | 0.0% | 0.01 | `prefix reads` +| 245.86 | 4,067,294.63 | 0.3% | 3,508.97 | 904.82 | 3.878 | 627.73 | 0.0% | 0.01 | `range reads` +| 381.14 | 2,623,691.76 | 0.2% | 5,127.16 | 1,402.60 | 3.655 | 830.59 | 1.7% | 0.01 | `point 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` +| 257.09 | 3,889,688.44 | 3.8% | 3,010.09 | 949.42 | 3.170 | 521.34 | 2.9% | 0.01 | `range 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` +| 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` +| 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) + | 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` -| 14.53 | 68,800,688.89 | 0.4% | 282.41 | 74.80 | 3.776 | 55.06 | 0.3% | 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` -| 16.69 | 59,912,106.02 | 0.6% | 314.57 | 86.29 | 3.645 | 39.84 | 0.4% | 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` -| 35.77 | 27,956,388.03 | 1.4% | 682.25 | 187.63 | 3.636 | 96.12 | 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` -| 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` -| 92.46 | 10,814,961.65 | 0.5% | 1,800.00 | 463.41 | 3.884 | 297.00 | 0.0% | 0.01 | `create and destroy` +| 12.81 | 78,088,759.03 | 0.7% | 187.38 | 47.15 | 3.974 | 33.70 | 0.5% | 0.01 | `point reads` +| 16.77 | 59,626,501.14 | 0.4% | 277.61 | 61.74 | 4.497 | 44.76 | 0.4% | 0.01 | `prefix reads` +| 42.45 | 23,556,818.87 | 0.4% | 856.96 | 156.09 | 5.490 | 126.22 | 0.2% | 0.01 | `range reads` +| 15.76 | 63,453,196.94 | 0.3% | 249.89 | 58.04 | 4.306 | 33.21 | 0.5% | 0.01 | `point 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 | 0.8% | 614.18 | 131.72 | 4.663 | 85.57 | 0.1% | 0.01 | `range 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` +| 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` +| 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 -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 ``` -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 ``` -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 @@ -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) ``` -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 ``` +