CSS Selector Benchmark

Webserver is started and is running on http://localhost:3000/.

Now go run a test:

npm run benchmark 1

Test

to see your current agreements or to 19 | sign a new one. 20 | 21 | ### Review our community guidelines 22 | 23 | This project follows 24 | [Google's Open Source Community Guidelines](https://opensource.google/conduct/). 25 | 26 | ## Contribution process 27 | 28 | ### Code reviews 29 | 30 | All submissions, including submissions by project members, require review. We 31 | use GitHub pull requests for this purpose. Consult 32 | [GitHub Help](https://help.github.com/articles/about-pull-requests/) for more 33 | information on using pull requests. 34 | -------------------------------------------------------------------------------- /src/benchmarks/blink/HasSiblingInvalidation.html: -------------------------------------------------------------------------------- 1 | 2 | 6 | 7 | 8 | 9 | 10 | 19 | 20 | 21 | 22 |

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25 | 60 | 61 | 62 | 63 | -------------------------------------------------------------------------------- /src/benchmarks/cssom/unitvalue.html: -------------------------------------------------------------------------------- 1 | 2 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | Test 13 | 66 | 67 | 68 | 69 |

70 | 71 | 72 | 73 | -------------------------------------------------------------------------------- /src/benchmarks/selectors/classnames.html: -------------------------------------------------------------------------------- 1 | 2 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | Test 13 | 14 | 82 | 83 | 84 | 85 |

86 | 87 | 88 | 89 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # CSS Selector Benchmark 2 | 3 | CSS Selector Benchmarks, using PerfTestRunner and Puppeteer 4 | 5 | ## Prerequisites 6 | 7 | ### Project Setup 8 | 9 | Install dependencies 10 | 11 | ```bash 12 | npm i 13 | ``` 14 | 15 | Install browsers to test with 16 | 17 | ```bash 18 | npx puppeteer browsers install chrome 19 | npx puppeteer browsers install firefox 20 | ``` 21 | 22 | ### Start the web server 23 | 24 | The benchmarks are HTML pages which need to be served by a web server 25 | 26 | ```bash 27 | npm run start 28 | ``` 29 | 30 | The Web Server is now running at http://localhost:3000/ 31 | 32 | ## Running a benchmark 33 | 34 | With the Web Server running, invoke a benchmark on the CLI: 35 | 36 | ```bash 37 | npm run benchmark example 38 | ``` 39 | 40 | This will run the benchmark served by `http://localhost:3000/benchmarks/example/`, whose source is located at `./src/benchmarks/example/index.html` 41 | 42 | Note: You can also run benchmarks directly in a browser. To do so, visit its URL and invoke `window.startTest().then(console.table);` on the Console. 43 | 44 | ### Choosing which browser to run the benchmarks in 45 | 46 | To select which browser to test things in, use the `--browser` option. 47 | 48 | ```bash 49 | npm run benchmark example -- --browser=firefox 50 | ``` 51 | 52 | Supported options: 53 | 54 | - `chrome` = Use Chrome 55 | - `chrome` = Use Chrome Stable 56 | - `chrome-beta` = Use Chrome Beta 57 | - `chrome-dev` = Use Chrome Dev 58 | - `chrome-canary` = Use Chrome Canary 59 | - `firefox`= Use Firefox 60 | 61 | The default used browser is `chrome`. 62 | 63 | A note will be printed on screen to show which version you are using. For example: 64 | 65 | ``` 66 | ℹ️ Running benchmark using browser firefox (firefox/129.0a1) 67 | ``` 68 | 69 | ## Creating a benchmark 70 | 71 | Benchmarks are HTML pages stored in a subfolder in `./src/benchmarks/`. The page **MUST** expose a `window.startTest` method which returns a promise. When the test logic is done, it **MUST** resolve that promise. 72 | 73 | This `window.startTest` is automatically invoked by `npm run benchmark x` when the page has loaded. Once `window.startTest` has resolved, the benchmark will be closed and any returned output will be logged. 74 | 75 | Using [Chromium’s `PerfTestRunner`](https://chromium.googlesource.com/chromium/src/+/refs/heads/main/third_party/blink/perf_tests/resources/runner.js), a typical test looks like this: 76 | 77 | ```html 78 | 91 | ``` 92 | 93 | Naming your benchmark `index.html` is not required, but then you need to append the filename to the invocation, e.g. `npm run benchmark dom/qsa.html`. 94 | -------------------------------------------------------------------------------- /src/benchmarks/is/element.html: -------------------------------------------------------------------------------- 1 | 2 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | :is() 14 | 101 | 102 | 103 | 104 |

105 | 106 | 107 | 108 | -------------------------------------------------------------------------------- /src/benchmarks/is/class.html: -------------------------------------------------------------------------------- 1 | 2 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | :is() 14 | 101 | 102 | 103 | 104 |

105 | 106 | 107 | 108 | -------------------------------------------------------------------------------- /src/benchmarks/nesting/without.html: -------------------------------------------------------------------------------- 1 | 2 | 6 | 7 | 8 | 9 | 10 | 11 | Test 12 | 18 | 38 | 39 | 40 |

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52 | 53 | 54 | -------------------------------------------------------------------------------- /src/benchmarks/nesting/without-is.html: -------------------------------------------------------------------------------- 1 | 2 | 6 | 7 | 8 | 9 | 10 | 11 | Test 12 | 18 | 38 | 39 | 40 |

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52 | 53 | 54 | -------------------------------------------------------------------------------- /src/benchmarks/nesting/with.html: -------------------------------------------------------------------------------- 1 | 2 | 6 | 7 | 8 | 9 | 10 | 11 | Test 12 | 20 | 40 | 41 | 42 |

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54 | 55 | 56 | -------------------------------------------------------------------------------- /src/benchmarks/is/misc.html: -------------------------------------------------------------------------------- 1 | 2 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | :is() 14 | 105 | 106 | 107 | 108 |

109 | 110 | 111 | 112 | -------------------------------------------------------------------------------- /src/benchmarks/nth-child-of-s/nth-child.html: -------------------------------------------------------------------------------- 1 | 2 | 6 | 7 | 8 | 9 | 10 | 11 | Test 12 | 28 | 48 | 49 | 50 |

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62 | 63 | 64 | -------------------------------------------------------------------------------- /src/benchmarks/has/sibling-scope--css.html: -------------------------------------------------------------------------------- 1 | 2 | 6 | 7 | 8 | 9 | 10 | 11 | Test 12 | 66 | 67 | 68 |

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116 | 117 | 118 | -------------------------------------------------------------------------------- /src/benchmarks/has/sibling-scope--qsa.html: -------------------------------------------------------------------------------- 1 | 2 | 6 | 7 | 8 | 9 | 10 | 11 | Test 12 | 69 | 70 | 71 |

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119 | 120 | 121 | -------------------------------------------------------------------------------- /src/benchmarks/selectors/index.html: -------------------------------------------------------------------------------- 1 | 2 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | Test 13 | 14 | 105 | 106 | 107 | 108 |

109 | 110 | 111 | 112 | -------------------------------------------------------------------------------- /src/benchmarks/nth-child-of-s/faked.html: -------------------------------------------------------------------------------- 1 | 2 | 6 | 7 | 8 | 9 | 10 | 11 | Test 12 | 30 | 50 | 51 | 52 |

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64 | 65 | 66 | -------------------------------------------------------------------------------- /cli/index.js: -------------------------------------------------------------------------------- 1 | /** 2 | * Copyright 2024 Google LLC 3 | * SPDX-License-Identifier: Apache-2.0 4 | */ 5 | 6 | import puppeteer from 'puppeteer'; 7 | 8 | const args = process.argv.slice(2); 9 | const flags = args.filter(a => a.startsWith('--')); 10 | const params = args.filter(a => !a.startsWith('--')); 11 | 12 | // Determine which page to use 13 | if (!params.length) { 14 | console.error('❌ Missing benchmark argument.'); 15 | process.exit(1); 16 | } 17 | const pageUrl = `http://localhost:3000/benchmarks/${process.argv[2]}`.trim(); 18 | 19 | // Determine which browser to use 20 | const supportedBrowsers = ['chrome', 'firefox']; 21 | const supportedBrowserChannels = { 22 | 'chrome': ['chrome', 'chrome-beta', 'chrome-canary', 'chrome-dev'], 23 | 'firefox': null, 24 | }; 25 | 26 | let requestedBrowser = flags.filter(f => f.startsWith('--browser=')).reduce((p, c) => `${p}${c}`, ''); 27 | let requestedBrowserChannel; 28 | 29 | if (requestedBrowser) { 30 | requestedBrowserChannel = requestedBrowser.replace('--browser=', ''); 31 | requestedBrowser = requestedBrowser.replace('--browser=', '').split('-')[0]; 32 | 33 | // Check if browser is suppported 34 | if (!supportedBrowsers.includes(requestedBrowser)) { 35 | console.error(`❌ Invalid browser “${requestedBrowser}”. Only accepted values are ${supportedBrowsers.join(', ')}`); 36 | process.exit(1); 37 | } 38 | 39 | // Check if channel is supported 40 | if (supportedBrowserChannels[requestedBrowser]) { 41 | if (!supportedBrowserChannels[requestedBrowser].includes(requestedBrowserChannel)) { 42 | console.error(`❌ Invalid browserChannel “${requestedBrowserChannel}” for browser “${requestedBrowser}”. Only accepted values are ${supportedBrowserChannels[requestedBrowser].join(', ')}`); 43 | process.exit(1); 44 | } 45 | } else { 46 | requestedBrowserChannel = null; 47 | } 48 | 49 | } else { 50 | requestedBrowser = supportedBrowsers[0]; 51 | requestedBrowserChannel = supportedBrowserChannels[requestedBrowser] ? supportedBrowserChannels[requestedBrowser][0] : null; 52 | } 53 | 54 | const puppeteerOptions = { 55 | 'chrome': { 56 | channel: requestedBrowserChannel, 57 | headless: 'new', 58 | args: [ 59 | "--flag-switches-begin", 60 | "--enable-experimental-web-platform-features", 61 | "--flag-switches-end", 62 | ], 63 | }, 64 | 'firefox': { 65 | 66 | }, 67 | }; 68 | 69 | const browser = await puppeteer.launch({ 70 | product: requestedBrowser, 71 | protocol: 'webDriverBiDi', 72 | ...puppeteerOptions[requestedBrowser], 73 | }); 74 | 75 | const browserVersion = await browser.version(); 76 | console.info(`ℹ️ Running benchmark using browser ${requestedBrowser} (${browserVersion})`); 77 | 78 | const page = await browser.newPage(); 79 | 80 | // Pipe Console output and errors to CLI 81 | page.on('console', (message) => { 82 | console.log(`${message.type().substr(0, 3).toUpperCase()} ${message.text()}`); 83 | }).on('pageerror', ({ message }) => { 84 | console.error(`❌ PageError: ${message}`); 85 | }); 86 | 87 | // Catch server not running 88 | page.on('requestfailed', (request) => { 89 | 90 | switch (request.failure().errorText) { 91 | case 'net::ERR_CONNECTION_REFUSED': 92 | console.error(`❌ Could not connect to server`); 93 | console.info('ℹ️ Please start the webserver first by running `npm run start` in parallel'); 94 | break; 95 | default: 96 | console.error(`❌ ${request.failure().errorText} ${request.url()}`); 97 | break; 98 | } 99 | process.exit(1); 100 | }); 101 | 102 | // Detect a 404 on the pageUrl, indicating it’s an invalid benchmark 103 | page.on('response', response => { 104 | if ((response.status() === 404) && (response.url() === pageUrl)) { 105 | console.error(`❌ Invalid benchmark. The page at ${pageUrl} could not be found`); 106 | process.exit(1); 107 | } 108 | }); 109 | 110 | // Navigate to test page 111 | await page.goto(pageUrl); 112 | 113 | // Run and wait for test 114 | console.log('== Starting Benchmark ====== '); 115 | const results = await page.evaluate(async () => { 116 | return await window.startTest(); 117 | }); 118 | console.log('== End Benchmark =========== '); 119 | 120 | // Process Results (@TODO) 121 | if (results) { 122 | for (const result of results) { 123 | console.log(result); 124 | } 125 | } 126 | 127 | // Close browser 128 | await browser.close(); 129 | -------------------------------------------------------------------------------- /src/benchmarks/nth-child-of-s/specific.html: -------------------------------------------------------------------------------- 1 | 2 | 6 | 7 | 8 | 9 | 10 | 11 | Test 12 | 18 | 84 | 85 | 86 |

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98 | 99 | 100 | -------------------------------------------------------------------------------- /cli/util/puppeteer.js: -------------------------------------------------------------------------------- 1 | /** 2 | * Copyright 2024 Google LLC 3 | * SPDX-License-Identifier: Apache-2.0 4 | */ 5 | 6 | // Util functions from the Puppeteer Recorder in DevTools 7 | 8 | async function waitForSelectors(selectors, frame, options = {}) { 9 | for (const selector of selectors) { 10 | try { 11 | return await waitForSelector(selector, frame, options); 12 | } catch (err) { 13 | console.error(err); 14 | } 15 | } 16 | throw new Error('Could not find element for selectors: ' + JSON.stringify(selectors)); 17 | } 18 | 19 | async function scrollIntoViewIfNeeded(selectors, frame, timeout) { 20 | const element = await waitForSelectors(selectors, frame, { visible: false, timeout }); 21 | if (!element) { 22 | throw new Error('The element could not be found.'); 23 | } 24 | await waitForConnected(element, timeout); 25 | const isInViewport = await element.isIntersectingViewport({ threshold: 0 }); 26 | if (isInViewport) { 27 | return; 28 | } 29 | await element.evaluate((element) => { 30 | element.scrollIntoView({ 31 | block: 'center', 32 | inline: 'center', 33 | behavior: 'auto', 34 | }); 35 | }); 36 | await waitForInViewport(element, timeout); 37 | } 38 | 39 | async function waitForConnected(element, timeout) { 40 | await waitForFunction(async () => { 41 | return await element.getProperty('isConnected'); 42 | }, timeout); 43 | } 44 | 45 | async function waitForInViewport(element, timeout) { 46 | await waitForFunction(async () => { 47 | return await element.isIntersectingViewport({ threshold: 0 }); 48 | }, timeout); 49 | } 50 | 51 | async function waitForSelector(selector, frame, options = {}) { 52 | if (!Array.isArray(selector)) { 53 | selector = [selector]; 54 | } 55 | if (!selector.length) { 56 | throw new Error('Empty selector provided to waitForSelector'); 57 | } 58 | let element = null; 59 | for (let i = 0; i < selector.length; i++) { 60 | const part = selector[i]; 61 | if (element) { 62 | element = await element.waitForSelector(part, options); 63 | } else { 64 | element = await frame.waitForSelector(part, options); 65 | } 66 | if (!element) { 67 | throw new Error('Could not find element: ' + selector.join('>>')); 68 | } 69 | if (i < selector.length - 1) { 70 | element = (await element.evaluateHandle((el) => (el.shadowRoot ? el.shadowRoot : el))).asElement(); 71 | } 72 | } 73 | if (!element) { 74 | throw new Error('Could not find element: ' + selector.join('|')); 75 | } 76 | return element; 77 | } 78 | 79 | async function waitForElement(step, frame, timeout) { 80 | const count = step.count || 1; 81 | const operator = step.operator || '>='; 82 | const comp = { 83 | '==': (a, b) => a === b, 84 | '>=': (a, b) => a >= b, 85 | '<=': (a, b) => a <= b, 86 | }; 87 | const compFn = comp[operator]; 88 | await waitForFunction(async () => { 89 | const elements = await querySelectorsAll(step.selectors, frame); 90 | return compFn(elements.length, count); 91 | }, timeout); 92 | } 93 | 94 | async function querySelectorsAll(selectors, frame) { 95 | for (const selector of selectors) { 96 | const result = await querySelectorAll(selector, frame); 97 | if (result.length) { 98 | return result; 99 | } 100 | } 101 | return []; 102 | } 103 | 104 | async function querySelectorAll(selector, frame) { 105 | if (!Array.isArray(selector)) { 106 | selector = [selector]; 107 | } 108 | if (!selector.length) { 109 | throw new Error('Empty selector provided to querySelectorAll'); 110 | } 111 | let elements = []; 112 | for (let i = 0; i < selector.length; i++) { 113 | const part = selector[i]; 114 | if (i === 0) { 115 | elements = await frame.$$(part); 116 | } else { 117 | const tmpElements = elements; 118 | elements = []; 119 | for (const el of tmpElements) { 120 | elements.push(...(await el.$$(part))); 121 | } 122 | } 123 | if (elements.length === 0) { 124 | return []; 125 | } 126 | if (i < selector.length - 1) { 127 | const tmpElements = []; 128 | for (const el of elements) { 129 | const newEl = (await el.evaluateHandle((el) => (el.shadowRoot ? el.shadowRoot : el))).asElement(); 130 | if (newEl) { 131 | tmpElements.push(newEl); 132 | } 133 | } 134 | elements = tmpElements; 135 | } 136 | } 137 | return elements; 138 | } 139 | 140 | async function waitForFunction(fn, timeout) { 141 | let isActive = true; 142 | const timeoutId = setTimeout(() => { 143 | isActive = false; 144 | }, timeout); 145 | while (isActive) { 146 | const result = await fn(); 147 | if (result) { 148 | clearTimeout(timeoutId); 149 | return; 150 | } 151 | await new Promise((resolve) => setTimeout(resolve, 100)); 152 | } 153 | throw new Error('Timed out'); 154 | } 155 | 156 | async function changeSelectElement(element, value) { 157 | await element.select(value); 158 | await element.evaluateHandle((e) => { 159 | e.blur(); 160 | e.focus(); 161 | }); 162 | } 163 | 164 | async function changeElementValue(element, value) { 165 | await element.focus(); 166 | await element.evaluate((input, value) => { 167 | input.value = value; 168 | input.dispatchEvent(new Event('input', { bubbles: true })); 169 | input.dispatchEvent(new Event('change', { bubbles: true })); 170 | }, value); 171 | } 172 | 173 | async function typeIntoElement(element, value) { 174 | const textToType = await element.evaluate((input, newValue) => { 175 | if (newValue.length <= input.value.length || !newValue.startsWith(input.value)) { 176 | input.value = ''; 177 | return newValue; 178 | } 179 | const originalValue = input.value; 180 | input.value = ''; 181 | input.value = originalValue; 182 | return newValue.substring(originalValue.length); 183 | }, value); 184 | await element.type(textToType); 185 | } 186 | 187 | export { 188 | waitForSelectors, 189 | scrollIntoViewIfNeeded, 190 | waitForConnected, 191 | waitForInViewport, 192 | waitForSelector, 193 | waitForElement, 194 | querySelectorsAll, 195 | querySelectorAll, 196 | waitForFunction, 197 | changeSelectElement, 198 | changeElementValue, 199 | typeIntoElement, 200 | }; 201 | -------------------------------------------------------------------------------- /src/benchmarks/has/global-vs-scoped.html: -------------------------------------------------------------------------------- 1 | 2 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | Test 13 | 89 | 223 | 224 | 225 | 252 |

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257 | Lorem ipsum dolor sit amet consectetur adipisicing elit. Repellat nam, 258 | quidem sunt dolorem earum facere modi aliquam laboriosam quos vitae 259 | ducimus laudantium quo cupiditate iste delectus. Sunt tenetur, est 260 | eligendi! 261 |

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263 | Id molestias modi sunt, voluptatum omnis, deleniti quis dolores a non 264 | repudiandae, consectetur soluta nihil natus amet. Vitae sint maxime, 265 | quidem nam. Ab fugiat nostrum, aperiam consequatur dignissimos totam 266 | fugit? 267 |

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269 | Odio facilis culpa nostrum, omnis nam quod cum architecto beatae 270 | cupiditate eaque asperiores, recusandae, ea esse odit porro accusantium 271 | earum ipsa possimus voluptas molestias et impedit. Illo cum deleniti 272 | necessitatibus? 273 |

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275 | Possimus vel dicta, aut ad nulla nisi numquam a atque dolorum aliquid 276 | labore sunt velit neque alias. Harum cumque veniam numquam, explicabo, 277 | laborum magni voluptatibus deleniti molestias omnis recusandae quidem! 278 |

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280 | Unde, delectus! Totam vero animi cum libero accusamus numquam minima 281 | culpa quam nesciunt omnis quae sapiente aliquid nemo nostrum earum alias 282 | asperiores illo, neque, delectus vel aliquam tenetur? Blanditiis, 283 | quibusdam. 284 |

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286 | 287 | 288 | -------------------------------------------------------------------------------- /src/benchmarks/at-rule/at-property.html: -------------------------------------------------------------------------------- 1 | 2 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | Test 13 | 267 | 268 | 269 | 270 |

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The text should be enclosed in the appropriate 184 | comment syntax for the file format. We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright [yyyy] [name of copyright owner] 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /src/lib/PerfTestRunner.js: -------------------------------------------------------------------------------- 1 | /** 2 | * Copyright 2024 Google LLC 3 | * SPDX-License-Identifier: Apache-2.0 4 | */ 5 | 6 | // This file is a slightly modified version of the one found in the Chromium source repository 7 | // https://chromium.googlesource.com/chromium/src/+/refs/heads/main/third_party/blink/perf_tests/resources/runner.js 8 | 9 | var logLines = null; 10 | var completedIterations = -1; 11 | var callsPerIteration = 1; 12 | var currentTest = null; 13 | var results = []; 14 | var jsHeapResults = []; 15 | var iterationCount = undefined; 16 | 17 | var PerfTestRunner = {}; 18 | 19 | // To make the benchmark results predictable, we replace Math.random with a 20 | // 100% deterministic alternative. 21 | PerfTestRunner.randomSeed = PerfTestRunner.initialRandomSeed = 49734321; 22 | 23 | PerfTestRunner.resetRandomSeed = function () { 24 | PerfTestRunner.randomSeed = PerfTestRunner.initialRandomSeed; 25 | }; 26 | 27 | PerfTestRunner.random = Math.random = function () { 28 | // Robert Jenkins' 32 bit integer hash function. 29 | var randomSeed = PerfTestRunner.randomSeed; 30 | randomSeed = (randomSeed + 0x7ed55d16 + (randomSeed << 12)) & 0xffffffff; 31 | randomSeed = (randomSeed ^ 0xc761c23c ^ (randomSeed >>> 19)) & 0xffffffff; 32 | randomSeed = (randomSeed + 0x165667b1 + (randomSeed << 5)) & 0xffffffff; 33 | randomSeed = ((randomSeed + 0xd3a2646c) ^ (randomSeed << 9)) & 0xffffffff; 34 | randomSeed = (randomSeed + 0xfd7046c5 + (randomSeed << 3)) & 0xffffffff; 35 | randomSeed = (randomSeed ^ 0xb55a4f09 ^ (randomSeed >>> 16)) & 0xffffffff; 36 | PerfTestRunner.randomSeed = randomSeed; 37 | return (randomSeed & 0xfffffff) / 0x10000000; 38 | }; 39 | 40 | PerfTestRunner.now = 41 | window.performance && window.performance.now 42 | ? function () { 43 | return window.performance.now(); 44 | } 45 | : Date.now; 46 | 47 | PerfTestRunner.logInfo = function (text) { 48 | if (!window.testRunner) this.log(text); 49 | }; 50 | 51 | PerfTestRunner.loadFile = function (path) { 52 | var xhr = new XMLHttpRequest(); 53 | xhr.open('GET', path, false); 54 | xhr.send(null); 55 | return xhr.responseText; 56 | }; 57 | 58 | PerfTestRunner.computeStatistics = function (times, unit) { 59 | var data = times.slice(); 60 | 61 | // Add values from the smallest to the largest to avoid the loss of significance 62 | data.sort(function (a, b) { 63 | return a - b; 64 | }); 65 | 66 | var middle = Math.floor(data.length / 2); 67 | var result = { 68 | min: data[0], 69 | max: data[data.length - 1], 70 | median: data.length % 2 ? data[middle] : (data[middle - 1] + data[middle]) / 2, 71 | }; 72 | 73 | // Compute the mean and variance using Knuth's online algorithm (has good numerical stability). 74 | var squareSum = 0; 75 | result.values = times; 76 | result.mean = 0; 77 | for (var i = 0; i < data.length; ++i) { 78 | var x = data[i]; 79 | var delta = x - result.mean; 80 | var sweep = i + 1.0; 81 | result.mean += delta / sweep; 82 | squareSum += delta * (x - result.mean); 83 | } 84 | result.variance = data.length <= 1 ? 0 : squareSum / (data.length - 1); 85 | result.stdev = Math.sqrt(result.variance); 86 | result.unit = unit || 'ms'; 87 | 88 | return result; 89 | }; 90 | 91 | PerfTestRunner.logStatistics = function (values, unit, title) { 92 | var statistics = this.computeStatistics(values, unit); 93 | this.log(''); 94 | this.log(title); 95 | if (statistics.values) this.log('values ' + statistics.values.join(', ') + ' ' + statistics.unit); 96 | this.log('avg ' + statistics.mean + ' ' + statistics.unit); 97 | this.log('median ' + statistics.median + ' ' + statistics.unit); 98 | this.log('stdev ' + statistics.stdev + ' ' + statistics.unit); 99 | this.log('min ' + statistics.min + ' ' + statistics.unit); 100 | this.log('max ' + statistics.max + ' ' + statistics.unit); 101 | }; 102 | 103 | function getUsedJSHeap() { 104 | return console.memory.usedJSHeapSize; 105 | } 106 | 107 | PerfTestRunner.gc = function () { 108 | if (window.GCController) window.GCController.collectAll(); 109 | else { 110 | function gcRec(n) { 111 | if (n < 1) return {}; 112 | var temp = { i: 'ab' + i + i / 100000 }; 113 | temp += 'foo'; 114 | gcRec(n - 1); 115 | } 116 | for (var i = 0; i < 1000; i++) gcRec(10); 117 | } 118 | }; 119 | 120 | function logInDocument(text) { 121 | console.log(text); 122 | } 123 | 124 | PerfTestRunner.log = function (text) { 125 | if (logLines) logLines.push(text); 126 | else logInDocument(text); 127 | }; 128 | 129 | PerfTestRunner.logFatalError = function (text) { 130 | PerfTestRunner.log('FATAL: ' + text); 131 | finish(); 132 | }; 133 | 134 | PerfTestRunner.assert_true = function (cond, text) { 135 | if (cond) return; 136 | PerfTestRunner.logFatalError(text); 137 | }; 138 | 139 | PerfTestRunner.assert_false = function (cond, text) { 140 | PerfTestRunner.assert_true(!cond, text); 141 | }; 142 | 143 | PerfTestRunner.formatException = function (text, exception) { 144 | return 'Got an exception while ' + text + ' with name=' + exception.name + ', message=' + exception.message + '\n' + exception.stack; 145 | }; 146 | 147 | PerfTestRunner.logException = function (text, exception) { 148 | PerfTestRunner.logFatalError(PerfTestRunner.formatException(text, exception)); 149 | }; 150 | 151 | PerfTestRunner.forceLayout = function (doc) { 152 | doc = doc || document; 153 | if (doc.body) doc.body.offsetHeight; 154 | else if (doc.documentElement) doc.documentElement.offsetHeight; 155 | }; 156 | 157 | function reset() { 158 | logLines = null; 159 | completedIterations = -1; 160 | callsPerIteration = 1; 161 | currentTest = null; 162 | results = []; 163 | jsHeapResults = []; 164 | iterationCount = undefined; 165 | } 166 | 167 | function start(test, scheduler, runner) { 168 | if (!test || !runner) { 169 | PerfTestRunner.logFatalError('Got a bad test object.'); 170 | return; 171 | } 172 | reset(); 173 | currentTest = test; 174 | 175 | 176 | if (currentTest.description) PerfTestRunner.logInfo('Description: ' + currentTest.description); 177 | 178 | if (currentTest.bootstrap) currentTest.bootstrap(); 179 | 180 | if (test.tracingCategories && !test.traceEventsToMeasure) { 181 | PerfTestRunner.logFatalError("test's tracingCategories is " + "specified but test's traceEventsToMeasure is empty"); 182 | return; 183 | } 184 | 185 | if (test.traceEventsToMeasure && !test.tracingCategories) { 186 | PerfTestRunner.logFatalError("test's traceEventsToMeasure is " + "specified but test's tracingCategories is empty"); 187 | return; 188 | } 189 | iterationCount = test.iterationCount || (window.testRunner ? 5 : 20); 190 | if (test.warmUpCount && test.warmUpCount > 0) completedIterations = -test.warmUpCount; 191 | logLines = PerfTestRunner.bufferedLog || window.testRunner ? [] : null; 192 | 193 | // Tests that run in workers are not impacted by the iteration control. 194 | if (!currentTest.runInWorker) { 195 | PerfTestRunner.log('Running ' + iterationCount + ' times'); 196 | } 197 | 198 | if (test.doNotIgnoreInitialRun) completedIterations++; 199 | 200 | if (window.testRunner && window.testRunner.telemetryIsRunning) { 201 | testRunner.waitForTelemetry(test.tracingCategories, function () { 202 | scheduleNextRun(scheduler, runner); 203 | }); 204 | return; 205 | } 206 | 207 | if (test.tracingCategories) { 208 | PerfTestRunner.log( 209 | 'Tracing based metrics are specified but ' + 210 | 'tracing is not supported on this platform. To get those ' + 211 | 'metrics from this test, you can run the test using ' + 212 | 'tools/perf/run_benchmarks script.' 213 | ); 214 | } 215 | scheduleNextRun(scheduler, runner); 216 | } 217 | 218 | function scheduleNextRun(scheduler, runner) { 219 | if (!scheduler) { 220 | // This is an async measurement test which has its own scheduler. 221 | try { 222 | runner(); 223 | } catch (exception) { 224 | PerfTestRunner.logException('running test.run', exception); 225 | } 226 | return; 227 | } 228 | 229 | scheduler(function () { 230 | // This will be used by tools/perf/benchmarks/blink_perf.py to find 231 | // traces during the measured runs. 232 | if (completedIterations == 0) console.time('blink_perf'); 233 | 234 | try { 235 | if (currentTest.setup) currentTest.setup(); 236 | 237 | var measuredValue = runner(); 238 | 239 | if (currentTest.teardown) currentTest.teardown(); 240 | } catch (exception) { 241 | PerfTestRunner.logException('running test.run', exception); 242 | return; 243 | } 244 | 245 | completedIterations++; 246 | 247 | try { 248 | ignoreWarmUpAndLog(measuredValue); 249 | } catch (exception) { 250 | PerfTestRunner.logException('logging the result', exception); 251 | return; 252 | } 253 | 254 | if (completedIterations < iterationCount) scheduleNextRun(scheduler, runner); 255 | else finish(); 256 | }); 257 | } 258 | 259 | function ignoreWarmUpAndLog(measuredValue) { 260 | var labeledResult = measuredValue + ' ' + PerfTestRunner.unit; 261 | // Tests that run in workers are not impacted by the iteration control. 262 | if (!currentTest.runInWorker && completedIterations <= 0) PerfTestRunner.log('Ignoring warm-up run (' + labeledResult + ')'); 263 | else { 264 | results.push(measuredValue); 265 | if (window.internals && !currentTest.doNotMeasureMemoryUsage) { 266 | jsHeapResults.push(getUsedJSHeap()); 267 | } 268 | PerfTestRunner.log(labeledResult); 269 | } 270 | } 271 | 272 | function finish() { 273 | try { 274 | // The blink_perf timer is only started for non-worker test. 275 | if (!currentTest.runInWorker) console.timeEnd('blink_perf'); 276 | PerfTestRunner.logStatistics(results, PerfTestRunner.unit, 'Time:'); 277 | if (jsHeapResults.length) { 278 | PerfTestRunner.logStatistics(jsHeapResults, 'bytes', 'JS Heap:'); 279 | } 280 | if (logLines) logLines.forEach(logInDocument); 281 | window.scrollTo(0, document.body.offsetHeight); 282 | if (currentTest.done) currentTest.done(results); 283 | } catch (exception) { 284 | PerfTestRunner.logException(PerfTestRunner.formatException('finalizing the test', exception)); 285 | } 286 | 287 | if (window.testRunner) { 288 | if (currentTest.traceEventsToMeasure && testRunner.telemetryIsRunning) { 289 | testRunner.stopTracingAndMeasure(currentTest.traceEventsToMeasure, function () { 290 | testRunner.notifyDone(); 291 | }); 292 | } else { 293 | testRunner.notifyDone(); 294 | } 295 | } 296 | } 297 | 298 | PerfTestRunner.startMeasureValuesAsync = function (test) { 299 | PerfTestRunner.unit = test.unit; 300 | start(test, undefined, function () { 301 | test.run(); 302 | }); 303 | }; 304 | 305 | PerfTestRunner.measureValueAsync = function (measuredValue) { 306 | completedIterations++; 307 | 308 | try { 309 | ignoreWarmUpAndLog(measuredValue); 310 | } catch (exception) { 311 | PerfTestRunner.logFatalError('Got an exception while logging the result with name=' + exception.name + ', message=' + exception.message); 312 | return; 313 | } 314 | 315 | if (completedIterations >= iterationCount) finish(); 316 | }; 317 | 318 | PerfTestRunner.addRunTestStartMarker = function () { 319 | if (!window.testRunner || !window.testRunner.telemetryIsRunning) return; 320 | if (completedIterations < 0) console.time('blink_perf.runTest.warmup'); 321 | else console.time('blink_perf.runTest'); 322 | }; 323 | 324 | PerfTestRunner.addRunTestEndMarker = function () { 325 | if (!window.testRunner || !window.testRunner.telemetryIsRunning) return; 326 | if (completedIterations < 0) console.timeEnd('blink_perf.runTest.warmup'); 327 | else console.timeEnd('blink_perf.runTest'); 328 | }; 329 | 330 | PerfTestRunner.measureFrameTime = function (test) { 331 | PerfTestRunner.unit = 'ms'; 332 | PerfTestRunner.bufferedLog = true; 333 | test.warmUpCount = test.warmUpCount || 5; 334 | test.iterationCount = test.iterationCount || 10; 335 | // Force gc before starting the test to avoid the measured time from 336 | // being affected by gc performance. See crbug.com/667811#c16. 337 | PerfTestRunner.gc(); 338 | start(test, requestAnimationFrame, measureFrameTimeOnce); 339 | }; 340 | 341 | PerfTestRunner.measureInnerRAFTime = function (test) { 342 | PerfTestRunner.unit = 'ms'; 343 | PerfTestRunner.bufferedLog = true; 344 | test.warmUpCount = test.warmUpCount || 5; 345 | test.iterationCount = test.iterationCount || 10; 346 | // Force gc before starting the test to avoid the measured time from 347 | // being affected by gc performance. See crbug.com/667811#c16. 348 | PerfTestRunner.gc(); 349 | start(test, requestAnimationFrame, measureTimeOnce); 350 | }; 351 | 352 | var lastFrameTime = -1; 353 | function measureFrameTimeOnce() { 354 | if (lastFrameTime != -1) PerfTestRunner.addRunTestEndMarker(); 355 | var now = PerfTestRunner.now(); 356 | var result = lastFrameTime == -1 ? -1 : now - lastFrameTime; 357 | lastFrameTime = now; 358 | PerfTestRunner.addRunTestStartMarker(); 359 | 360 | var returnValue = currentTest.run(); 361 | if (returnValue - 0 === returnValue) { 362 | if (returnValue < 0) PerfTestRunner.log('runFunction returned a negative value: ' + returnValue); 363 | return returnValue; 364 | } 365 | 366 | return result; 367 | } 368 | 369 | PerfTestRunner.measureTime = function (test) { 370 | PerfTestRunner.unit = 'ms'; 371 | PerfTestRunner.bufferedLog = true; 372 | start(test, zeroTimeoutScheduler, measureTimeOnce); 373 | }; 374 | 375 | PerfTestRunner.measureValue = function (test) { 376 | PerfTestRunner.unit = test.unit; 377 | start(test, zeroTimeoutScheduler, measureTimeOnce); 378 | }; 379 | 380 | function zeroTimeoutScheduler(task) { 381 | setTimeout(task, 0); 382 | } 383 | 384 | function measureTimeOnce() { 385 | // Force gc before measuring time to avoid interference between tests. 386 | PerfTestRunner.gc(); 387 | 388 | PerfTestRunner.addRunTestStartMarker(); 389 | var start = PerfTestRunner.now(); 390 | var returnValue = currentTest.run(); 391 | var end = PerfTestRunner.now(); 392 | PerfTestRunner.addRunTestEndMarker(); 393 | 394 | if (returnValue - 0 === returnValue) { 395 | if (returnValue < 0) PerfTestRunner.log('runFunction returned a negative value: ' + returnValue); 396 | return returnValue; 397 | } 398 | 399 | return end - start; 400 | } 401 | 402 | PerfTestRunner.measureRunsPerSecond = function (test) { 403 | PerfTestRunner.unit = 'runs/s'; 404 | start(test, zeroTimeoutScheduler, measureRunsPerSecondOnce); 405 | }; 406 | 407 | function measureRunsPerSecondOnce() { 408 | var timeToRun = 750; 409 | var totalTime = 0; 410 | var numberOfRuns = 0; 411 | 412 | while (totalTime < timeToRun) { 413 | totalTime += callRunAndMeasureTime(callsPerIteration); 414 | numberOfRuns += callsPerIteration; 415 | if (completedIterations < 0 && totalTime < 100) callsPerIteration = Math.max(10, 2 * callsPerIteration); 416 | } 417 | 418 | return (numberOfRuns * 1000) / totalTime; 419 | } 420 | 421 | function callRunAndMeasureTime(callsPerIteration) { 422 | // Force gc before measuring time to avoid interference between tests. 423 | PerfTestRunner.gc(); 424 | 425 | var startTime = PerfTestRunner.now(); 426 | for (var i = 0; i < callsPerIteration; i++) currentTest.run(); 427 | return PerfTestRunner.now() - startTime; 428 | } 429 | 430 | PerfTestRunner.measurePageLoadTime = function (test) { 431 | var file = PerfTestRunner.loadFile(test.path); 432 | test.run = function () { 433 | if (!test.chunkSize) this.chunkSize = 50000; 434 | 435 | var chunks = []; 436 | // The smaller the chunks the more style resolves we do. 437 | // Smaller chunk sizes will show more samples in style resolution. 438 | // Larger chunk sizes will show more samples in line layout. 439 | // Smaller chunk sizes run slower overall, as the per-chunk overhead is high. 440 | var chunkCount = Math.ceil(file.length / this.chunkSize); 441 | for (var chunkIndex = 0; chunkIndex < chunkCount; chunkIndex++) { 442 | var chunk = file.substr(chunkIndex * this.chunkSize, this.chunkSize); 443 | chunks.push(chunk); 444 | } 445 | 446 | PerfTestRunner.logInfo('Testing ' + file.length + ' byte document in ' + chunkCount + ' ' + this.chunkSize + ' byte chunks.'); 447 | 448 | var iframe = document.createElement('iframe'); 449 | document.body.appendChild(iframe); 450 | 451 | iframe.sandbox = ''; // Prevent external loads which could cause write() to return before completing the parse. 452 | iframe.style.width = '600px'; // Have a reasonable size so we're not line-breaking on every character. 453 | iframe.style.height = '800px'; 454 | iframe.contentDocument.open(); 455 | 456 | for (var chunkIndex = 0; chunkIndex < chunks.length; chunkIndex++) { 457 | iframe.contentDocument.write(chunks[chunkIndex]); 458 | PerfTestRunner.forceLayout(iframe.contentDocument); 459 | } 460 | 461 | iframe.contentDocument.close(); 462 | document.body.removeChild(iframe); 463 | }; 464 | 465 | PerfTestRunner.measureTime(test); 466 | }; 467 | 468 | // Used for tests that run in workers. 469 | // 1. Call this method to trigger the test. It should be used together 470 | // with |WorkerTestHelper.measureRunsPerSecond()| which is defined in 471 | // src/third_party/blink/perf_tests/resources/worker-test-helper.js. 472 | // 2. The iteration control parameters (test.iterationCount, 473 | // test.doNotIgnoreInitialRun, and test.warmUpCount) are ignored. 474 | // Use parameters of |measureRunsPerSecond()| to control iteration. 475 | // 3. Test result should be sent to the page where the test is triggered. 476 | // Then the result should be recorded by |recordResultFromWorker()| to 477 | // finish the test. 478 | PerfTestRunner.startMeasureValuesInWorker = function (test) { 479 | PerfTestRunner.unit = test.unit; 480 | test.runInWorker = true; 481 | start(test, undefined, function () { 482 | test.run(); 483 | }); 484 | }; 485 | 486 | // Used for tests that run in workers. 487 | // This method records the result posted from worker thread and finishes the test. 488 | PerfTestRunner.recordResultFromWorker = function (result) { 489 | if (result.error) { 490 | PerfTestRunner.logFatalError(result.error); 491 | return; 492 | } 493 | 494 | PerfTestRunner.log('Running ' + result.values.length + ' times'); 495 | try { 496 | result.values.forEach((value) => { 497 | ignoreWarmUpAndLog(value); 498 | }); 499 | } catch (exception) { 500 | PerfTestRunner.logFatalError('Got an exception while logging the result with name=' + exception.name + ', message=' + exception.message); 501 | return; 502 | } 503 | 504 | finish(); 505 | }; 506 | 507 | export default PerfTestRunner; 508 | -------------------------------------------------------------------------------- /src/benchmarks/at-rule/influence.html: -------------------------------------------------------------------------------- 1 | 2 | 6 | 7 | 8 | 9 | 10 | 11 | Test 12 | 32 | 117 | 118 | 119 |

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