| 1 | const Benchmark = require('benchmark') |
| 2 | const { generateRandomInteger, LIST_FORMATTER } = require('./benchmark-utils') |
| 3 | |
| 4 | const suite = new Benchmark.Suite() |
| 5 | |
| 6 | /** |
| 7 | * @param numberOfWorkers |
| 8 | * @param maxNumberOfTasksPerWorker |
| 9 | */ |
| 10 | function generateRandomTasksMap ( |
| 11 | numberOfWorkers, |
| 12 | maxNumberOfTasksPerWorker = 10 |
| 13 | ) { |
| 14 | const tasksArray = [] |
| 15 | for (let i = 0; i < numberOfWorkers; i++) { |
| 16 | const task = [i, generateRandomInteger(maxNumberOfTasksPerWorker)] |
| 17 | tasksArray.push(task) |
| 18 | } |
| 19 | return new Map(tasksArray) |
| 20 | } |
| 21 | |
| 22 | const tasksMap = generateRandomTasksMap(60, 20) |
| 23 | |
| 24 | /** |
| 25 | * @param tasksMap |
| 26 | */ |
| 27 | function loopSelect (tasksMap) { |
| 28 | let minValue = Infinity |
| 29 | let minKey |
| 30 | for (const [key, value] of tasksMap) { |
| 31 | if (value === 0) { |
| 32 | return key |
| 33 | } else if (value < minValue) { |
| 34 | minKey = key |
| 35 | minValue = value |
| 36 | } |
| 37 | } |
| 38 | return [minKey, minValue] |
| 39 | } |
| 40 | |
| 41 | /** |
| 42 | * @param tasksMap |
| 43 | */ |
| 44 | function arraySortSelect (tasksMap) { |
| 45 | const tasksArray = Array.from(tasksMap) |
| 46 | return tasksArray.sort((a, b) => { |
| 47 | if (a[1] < b[1]) { |
| 48 | return -1 |
| 49 | } else if (a[1] > b[1]) { |
| 50 | return 1 |
| 51 | } |
| 52 | return 0 |
| 53 | })[0] |
| 54 | } |
| 55 | |
| 56 | const defaultComparator = (a, b) => { |
| 57 | return a < b |
| 58 | } |
| 59 | |
| 60 | const defaultPivotIndexSelect = (leftIndex, rightIndex) => { |
| 61 | return leftIndex + Math.floor((rightIndex - leftIndex) / 2) |
| 62 | } |
| 63 | |
| 64 | const randomPivotIndexSelect = (leftIndex, rightIndex) => { |
| 65 | return generateRandomInteger(leftIndex, rightIndex) |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * @param array |
| 70 | * @param index1 |
| 71 | * @param index2 |
| 72 | */ |
| 73 | function swap (array, index1, index2) { |
| 74 | const tmp = array[index1] |
| 75 | array[index1] = array[index2] |
| 76 | array[index2] = tmp |
| 77 | } |
| 78 | |
| 79 | /** |
| 80 | * @param array |
| 81 | * @param leftIndex |
| 82 | * @param rightIndex |
| 83 | * @param pivotIndex |
| 84 | * @param compare |
| 85 | */ |
| 86 | function partition ( |
| 87 | array, |
| 88 | leftIndex, |
| 89 | rightIndex, |
| 90 | pivotIndex, |
| 91 | compare = defaultComparator |
| 92 | ) { |
| 93 | const pivotValue = array[pivotIndex] |
| 94 | swap(array, pivotIndex, rightIndex) |
| 95 | let storeIndex = leftIndex |
| 96 | for (let i = leftIndex; i < rightIndex; i++) { |
| 97 | if (compare(array[i], pivotValue)) { |
| 98 | swap(array, storeIndex, i) |
| 99 | storeIndex++ |
| 100 | } |
| 101 | } |
| 102 | swap(array, rightIndex, storeIndex) |
| 103 | return storeIndex |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * @param array |
| 108 | * @param k |
| 109 | * @param leftIndex |
| 110 | * @param rightIndex |
| 111 | * @param compare |
| 112 | * @param pivotIndexSelect |
| 113 | */ |
| 114 | function selectLoop ( |
| 115 | array, |
| 116 | k, |
| 117 | leftIndex, |
| 118 | rightIndex, |
| 119 | compare = defaultComparator, |
| 120 | pivotIndexSelect = defaultPivotIndexSelect |
| 121 | ) { |
| 122 | while (true) { |
| 123 | if (leftIndex === rightIndex) return array[leftIndex] |
| 124 | let pivotIndex = pivotIndexSelect(leftIndex, rightIndex) |
| 125 | pivotIndex = partition(array, leftIndex, rightIndex, pivotIndex, compare) |
| 126 | if (k === pivotIndex) { |
| 127 | return array[k] |
| 128 | } else if (k < pivotIndex) { |
| 129 | rightIndex = pivotIndex - 1 |
| 130 | } else { |
| 131 | leftIndex = pivotIndex + 1 |
| 132 | } |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | /** |
| 137 | * @param array |
| 138 | * @param k |
| 139 | * @param leftIndex |
| 140 | * @param rightIndex |
| 141 | * @param compare |
| 142 | * @param pivotIndexSelect |
| 143 | */ |
| 144 | function selectRecursion ( |
| 145 | array, |
| 146 | k, |
| 147 | leftIndex, |
| 148 | rightIndex, |
| 149 | compare = defaultComparator, |
| 150 | pivotIndexSelect = defaultPivotIndexSelect |
| 151 | ) { |
| 152 | if (leftIndex === rightIndex) return array[leftIndex] |
| 153 | let pivotIndex = pivotIndexSelect(leftIndex, rightIndex) |
| 154 | pivotIndex = partition(array, leftIndex, rightIndex, pivotIndex, compare) |
| 155 | if (k === pivotIndex) { |
| 156 | return array[k] |
| 157 | } else if (k < pivotIndex) { |
| 158 | return selectRecursion(array, k, leftIndex, pivotIndex - 1, compare) |
| 159 | } else { |
| 160 | return selectRecursion(array, k, pivotIndex + 1, rightIndex, k, compare) |
| 161 | } |
| 162 | } |
| 163 | |
| 164 | /** |
| 165 | * @param tasksMap |
| 166 | */ |
| 167 | function quickSelectLoop (tasksMap) { |
| 168 | const tasksArray = Array.from(tasksMap) |
| 169 | |
| 170 | return selectLoop(tasksArray, 0, 0, tasksArray.length - 1, (a, b) => { |
| 171 | return a[1] < b[1] |
| 172 | }) |
| 173 | } |
| 174 | |
| 175 | /** |
| 176 | * @param tasksMap |
| 177 | */ |
| 178 | function quickSelectLoopRandomPivot (tasksMap) { |
| 179 | const tasksArray = Array.from(tasksMap) |
| 180 | |
| 181 | return selectLoop( |
| 182 | tasksArray, |
| 183 | 0, |
| 184 | 0, |
| 185 | tasksArray.length - 1, |
| 186 | (a, b) => { |
| 187 | return a[1] < b[1] |
| 188 | }, |
| 189 | randomPivotIndexSelect |
| 190 | ) |
| 191 | } |
| 192 | |
| 193 | /** |
| 194 | * @param tasksMap |
| 195 | */ |
| 196 | function quickSelectRecursion (tasksMap) { |
| 197 | const tasksArray = Array.from(tasksMap) |
| 198 | |
| 199 | return selectRecursion(tasksArray, 0, 0, tasksArray.length - 1, (a, b) => { |
| 200 | return a[1] < b[1] |
| 201 | }) |
| 202 | } |
| 203 | |
| 204 | /** |
| 205 | * @param tasksMap |
| 206 | */ |
| 207 | function quickSelectRecursionRandomPivot (tasksMap) { |
| 208 | const tasksArray = Array.from(tasksMap) |
| 209 | |
| 210 | return selectRecursion( |
| 211 | tasksArray, |
| 212 | 0, |
| 213 | 0, |
| 214 | tasksArray.length - 1, |
| 215 | (a, b) => { |
| 216 | return a[1] < b[1] |
| 217 | }, |
| 218 | randomPivotIndexSelect |
| 219 | ) |
| 220 | } |
| 221 | |
| 222 | // console.log(Array.from(tasksMap)) |
| 223 | // console.log(loopSelect(tasksMap)) |
| 224 | // console.log(arraySortSelect(tasksMap)) |
| 225 | // console.log(quickSelectLoop(tasksMap)) |
| 226 | // console.log(quickSelectLoopRandomPivot(tasksMap)) |
| 227 | // console.log(quickSelectRecursion(tasksMap)) |
| 228 | // console.log(quickSelectRecursionRandomPivot(tasksMap)) |
| 229 | |
| 230 | suite |
| 231 | .add('Loop select', function () { |
| 232 | loopSelect(tasksMap) |
| 233 | }) |
| 234 | .add('Array sort select', function () { |
| 235 | arraySortSelect(tasksMap) |
| 236 | }) |
| 237 | .add('Quick select loop', function () { |
| 238 | quickSelectLoop(tasksMap) |
| 239 | }) |
| 240 | .add('Quick select loop with random pivot', function () { |
| 241 | quickSelectLoopRandomPivot(tasksMap) |
| 242 | }) |
| 243 | .add('Quick select recursion', function () { |
| 244 | quickSelectRecursion(tasksMap) |
| 245 | }) |
| 246 | .add('Quick select recursion with random pivot', function () { |
| 247 | quickSelectRecursionRandomPivot(tasksMap) |
| 248 | }) |
| 249 | .on('cycle', function (event) { |
| 250 | console.log(event.target.toString()) |
| 251 | }) |
| 252 | .on('complete', function () { |
| 253 | console.log( |
| 254 | 'Fastest is ' + LIST_FORMATTER.format(this.filter('fastest').map('name')) |
| 255 | ) |
| 256 | // eslint-disable-next-line no-process-exit |
| 257 | process.exit() |
| 258 | }) |
| 259 | .run() |