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Off-the-main-thread with WorkerDOM Kyoto.js #15 ฏ໺ ণ࢜(@shisama)

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ฏ໺ ণ࢜ / Masashi Hirano ɹɹɹɹ Kyoto ofﬁce @shisama_ @shisama Node.js Core Collaborator ؔ੢NodeֶԂOrganizer

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αΠϘ΢ζେࡕΦϑΟε കాࡕٸΦϑΟεϏϧ

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஫ҙ ࠓճग़ͯ͘Δ࿩͸ ·ͩٞ࿦தͷ಺༰΋ ؚ·Ε͍ͯ·͢

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Agenda • Performance • off-the-main-thread • WebWorker • WorkerDOM (+ React)

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Performance

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Performance • ͦ΋ͦ΋Web͸ૣ͍ • ଟػೳ΍ϦονͳUIΛఏڙ͢Δ͔Β஗͘ͳΔ • ஗͘ͳΔͷʹ΋༷ʑͳཁҼ͕͋Δ  ɾωοτϫʔΫ  ɾϨϯμϦϯά  ɾJavaScript etc…

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Performance • ωοτϫʔΫͷ໰୊͸վળ͞Ε͖ͯͨ  ɾϦΫΤετճ਺ͷ࡟ݮ  ɾCache  ɾHTTP/2 etc… • JavaScriptͷ࣮ߦ΍ϨϯμϦϯά͕ϘτϧωοΫʹͳ͖ͬͯͨ • ࠷ۙ͸ϑϩϯτΤϯυͰCPUϔϏʔͳॲཧ͕࣮ߦ͞ΕΔ

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ϝΠϯεϨουͰscripting΍rendering͕ ߦΘΕ͍ͯΔ

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ChromeͷAudits(Lighthouse)Ͱ PerformanceΛܭଌ͢ΔͱϝΠϯεϨουͷ JSͷॲཧΛݮΒ͢Α͏ʹڭ͑ͯ͘ΕΔ

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off-the-main-thread

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off-the-main-threadͱ͸ • ϝΠϯεϨουͱ͸ผεϨουʹॲཧΛҕৡ͢Δ͜ͱ • ϝΠϯεϨουΛઐ༗͢ΔͱUI΍ϢʔβʔΠϯλϥΫγϣϯͷॲ ཧ͕ϒϩοΫ͞ΕΔ • 16msҎ্ϝΠϯεϨουΛࢭΊͪΌμϝ

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6TFS*OUFSBDUJPO 'FFECBDL )FBWZ5BTL ϝΠϯεϨουΛઐ༗ UIʹϥά͕ੜ͡Δ ΧΫ͖ͭɾ΋͖ͨͭΛײ͡Δ

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$BMM )FBWZ 5BTL 3FTQPOTF 'FFECBDL 6TFS*OUFSBDUJPO 'FFECBDL .BJO5ISFBE 0UIFS5ISFBE

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)FBWZ 5BTL 'FFECBDL 6TFS*OUFSBDUJPO 'FFECBDL $BMM 3FTQPOTF .BJO5ISFBE 0UIFS5ISFBE Ͳ͏΍ͬͯ΍Δ…?

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WebWorker

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https://developer.mozilla.org/ja/docs/Web/API/Web_Workers_API

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https://caniuse.com/#feat=webworkers

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https://github.com/nodejs/node/pull/25361

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WebWorkerͱ͸ • JavaScriptͰ΋ϚϧνεϨου͕࢖༻Մೳ • Worker༻ͷJSϑΝΠϧΛ༻ҙͯ͠WorkerεϨουͰ࣮ߦ • ͓ޓ͍ͷεϨου͸ಠཱͨ͠ϝϞϦྖҬΛ֬อ͍ͯ͠Δ  ɾεϨουA͔ΒεϨουBͷ஋ʹ͸ΞΫηεͰ͖ͳ͍  ɾεϨουؒ͸ϝοηʔδύογϯάͰσʔλΛ΍ΓऔΓ͢Δ

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// workerͰ࣮ߦ͢ΔϑΝΠϧΛࢦఆ͠workerੜ੒ const worker = new Worker(“./worker.js"); // workerʹσʔλΛ౉͢ worker.postMessage(time); // workerଆ͔ΒσʔλΛड͚औͬͨͱ͖ worker.onmessage = (e) => { const el = document.createElement('div'); el.textContent = e.data; document.body.appendChild(el); } εϨουؒͷσʔλڞ༗ // ϝΠϯεϨου͔ΒσʔλΛड͚औͬͨͱ͖ onmessage = (e) => { const n = e.data; for (let i = 0; i <= n; i++) { // Կ͔ॏ͍ॲཧ // ॲཧ݁ՌΛϝΠϯεϨουʹ౉͢ postMessage(result); } } ϝΠϯεϨου Worker༻ϑΝΠϧ

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http://nerget.com/rayjs-mt/rayjs.html ը૾ॲཧͰൺֱ ࠨ: Workerͳ͠ 1.647s ӈ: 4ͭͷWorker 0.765

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WebWorkerͷ՝୊ • postMessage͸ϝϞϦͷڞ༗Ͱ͸ͳ͘ίϐʔΛ౉͍ͯ͠Δ  • postMessage࢖͍ͮΒ͘ͳ͍…?  • Worker಺ͰDOMૢ࡞͕Ͱ͖ͳ͍

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WebWorkerͷ՝୊ • postMessage͸ϝϞϦͷڞ༗Ͱ͸ͳ͘ίϐʔΛ౉͍ͯ͠Δ  SharedArrayBufferͱAtomics APIΛ࢖͏ • postMessage࢖͍ͮΒ͘ͳ͍…?  Comlink΍ClooneyΛ࢖͏ • Worker಺ͰDOMૢ࡞͕Ͱ͖ͳ͍  WorkerDOMΛ࢖͏

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WebWorkerͷ՝୊ • postMessage͸ϝϞϦͷڞ༗Ͱ͸ͳ͘ίϐʔ  SharedArrayBufferͱAtomics APIΛ࢖͏ • postMessage࢖͍ͮΒ͘ͳ͍…?  Comlink΍ClooneyΛ࢖͏ • Worker಺ͰDOMૢ࡞͕Ͱ͖ͳ͍  WorkerDOMΛ࢖͏

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http://2ality.com/2017/01/shared-array-buffer.html ࢀߟ: SharedArrayBufferͱAtomics API https://qiita.com/yosuke_furukawa/items/923f8d40c451713dfbd3

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https://github.com/GoogleChromeLabs/comlink ࢀߟ: Comlink

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https://github.com/GoogleChromeLabs/clooney ࢀߟ: Clooney

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WorkerDOM

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https://github.com/ampproject/worker-dom

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WorkerDOMͱ͸ • WebWorkerͰDOMૢ࡞Λߦ͏ͨΊͷϥΠϒϥϦ • AMP(Accelerated Mobile Pages)ϓϩδΣΫτ͕։ൃ • ·ͩalpha൛

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WorkerDOM࢖͍ํ • npm  npm install @ampproject/worker-dom • CDN  https://unpkg.com/@ampproject/worker-dom@0.2.8

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import {upgradeElement} from ‘/path/to/index.mjs’; upgradeElement(document.getElementById(‘upgrade-me'), ‘/path/to/worker.mjs’); WorkerDOM࢖͍ํ for (let i = 0; i <= n; i++) { // Կ͔ॏ͍ॲཧ // ॲཧ݁ՌΛϝΠϯεϨουʹ౉͢ const el = document.createElement('div'); el.textContent = result; document.body.appendChild(el); } HTML (ϝΠϯεϨου) : Worker༻ϑΝΠϧ :

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import {upgradeElement} from ‘/path/to/index.mjs’; upgradeElement(document.getElementById(‘upgrade-me'), ‘/path/to/worker.mjs’); WorkerDOM࢖͍ํ 1. WorkerଆͰ࣮ߦ͢ΔϑΝΠϧΛࢦఆ 2. worker-domͷindex.mjs͔ΒupgradeElementؔ਺Λimport 3. 1ͷDOMͱworker-domͷworker.mjsΛҾ਺ʹઃఆ࣮͠ߦ

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WorkerDOMͰԿ͕Ͱ͖Δͷ͔ • ͢΂ͯͷॲཧΛWorkerଆʹҕৡ͢Δ͜ͱ͕Ͱ͖Δ͔΋ • AMPͰ΋೚ҙͷJavaScriptΛ࣮ߦͰ͖Δ͔΋  ɾamp-script͸಺෦ͰWorkerDOMΛ࢖͍ͬͯΔ • React΍VueͳͲ΋Worker಺Ͱ࣮ߦ͢Δ͜ͱ͕Ͱ͖Δ  ɾampproject/worker-domʹ͸preactΛಈ͔͢σϞ͕͋Δ  ɾWorkerDOM + React ࢼͯ͠Έͨ 

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import {upgradeElement} from '/dist/index.mjs'; upgradeElement(document.getElementById(‘hello’), '/dist/worker.mjs'); WorkerDOM + React const App = () => { return

Hello, World!

; }; ReactDOM.render(, document.getElementById('root')); HTML (ϝΠϯεϨου) : Worker༻ϑΝΠϧ :

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import {upgradeElement} from '/dist/index.mjs'; upgradeElement(document.getElementById(‘hello’), '/dist/worker.mjs'); WorkerDOM + React const App = () => { return

Hello, World!

; }; ReactDOM.render(, document.getElementById('root')); HTML (ϝΠϯεϨου) : Worker༻ϑΝΠϧ : Workerଆ͔ΒΞΫηε͍ͨ͠DOM͸ upgradeElementͰࢦఆ͢ΔDOMͷதʹॻ͘

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https://shisama.github.io/worker-dom-sample/react-app/ create-react-app

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https://shisama.github.io/worker-dom-sample/react-app/ WorkerεϨουͰ࣮ߦ͞Ε͍ͯΔ͔֬ೝ

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https://shisama.github.io/worker-dom-sample/react-app/ WorkerεϨουͰ࣮ߦ͞Ε͍ͯΔ͔֬ೝ

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preact demo@ampproject/worker-dom https://github.com/ampproject/worker-dom/tree/master/demo/preact-dbmon

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·ͱΊ • ϝΠϯεϨουͰϔϏʔͳॲཧΛ͍ͯ͠ͳ͍͔֬ೝ͠Α͏ • WebWorkerͰϔϏʔͳॲཧΛϝΠϯεϨου͔Βಀ͕ͦ͏ • WorkerDOMΛ࢖͏ͱWebWorkerͰ΋DOMૢ࡞͕ՄೳʹͳΔ • ReactͳͲ΋Worker಺Ͱ࣮ߦ͢Δ͜ͱ͕Ͱ͖Δ

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ࢀߟ • ΢Σϒϒϥ΢βͷ off-the-main-thread API ͷ࿩ (@nhiroki) • Off the main thread with workers ! - Speaker Deck (@kosamari) • off-the-main-thread ͷ࣌୅ (@mizchi) • Off the main threadͷ࿩ - Speaker Deck (@yosuke_furukawa) • Web WorkersΛ༻͍ͯJavaScriptΛϚϧνεϨουԽ͢Δ (@kfurumiya)

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Thanks.