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Running in Parallel NgRx with WebAssembly, Web Workers and Worklets

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Running in Parallel All the Buzz Words, I ever heard

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Running in Parallel The Way to Performance

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Vitalii Bobrov • Lead SW Engineer @ EPAM • Angular Wrocław organizer • Angular in Depth contributor • Performance warrior @bobrov1989 https://bobrov.dev

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I brought something interesting to share

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Topics • Parallel Computations • Web Workers • Worklets • Web Assembly & AssemblyScript

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Parallel Computations

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Border Control

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Passport Control Border Line One Thread

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Passport Control Border Line One Thread

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Passport Control Border Line One Thread

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Passport Control Border Line Async

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Passport Control Border Line Async

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Passport Control Border Line Async

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Passport Control Border Line Async

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Passport Control Border Line Async

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Parallel doesn’t mean X times faster

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Passport Control Border Line Multi Thread Passport Control Line

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Passport Control Border Line Multi Thread Passport Control Line

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Passport Control Border Line Multi Thread Passport Control Line

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Thread is not equal to CPU core

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All Passports Border Line Worker / Worklet EU Passports Line

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All Passports Border Line Worker / Worklet EU Passports Line

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All Passports Border Line Worker / Worklet EU Passports Line

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Complicate Code

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Web Workers

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UI Blocking

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Disappointed User

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const worker = new Worker('path/to/worker.js'); Init Web Worker

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Full-Duplex Communication Main Thread Worker Thread worker.postMessage('data'); worker.addEventListener('message', (event: MessageEvent) => { console.log(event.data); }); addEventListener('message', (event: MessageEvent) => { console.log(event.data); }); postMessage('response');

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ng generate worker my-web-worker Web Worker with CLI v8+

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Worker implementation addEventListener('message', ({ data }) => { data.sort((a, b) => { for (let i = 0; i < 10000; i++) { const sum = i * Math.random() * 10; } return a.order - b.order; }); postMessage(data); });

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NgRx Power

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NgRx Effects @Effect({ dispatch: false }) sortWorkerThread$ = this.actions$.pipe( ofType(WebWorkerActionTypes.WebWorkerSort), map(({ payload }) => this.workerInstance.postMessage(payload.items) ));

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NgRx Effects @Effect() workerSortSuccess$ = fromEvent(this.workerInstance, 'message') .pipe(map((event: MessageEvent) => new WorkerSortSuccess({ items: event.data })));

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Off-thread

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Worklets

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Available Worklets • Paint • Animation • Layout • Audio

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Paint API

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Half-Duplex Communication Main Thread Worklet Thread class CirclesPainter { static get inputProperties() { return [ '--circles-offset', '--circles-count', '--circles-opacity' ]; } } element.style .setProperty('--circles-offset', 10);

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Half-Duplex Communication Main Thread Worklet Thread class CirclesPainter { static get inputProperties() { return [ '--circles-offset', '--circles-count', '--circles-opacity' ]; } } :root { --circles-count: 2; --circles-offset: 10; --circles-opacity: 1; }

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Create Worklet class MyPaint { paint(ctx: CanvasRenderingContext2D) { ctx.beginPath(); ctx.arc(x, y, outerRadius, 0, Math.PI * 2, false); ctx.arc(x, y, innerRadius, 0, Math.PI * 2, true); ctx.fill(); } } registerPaint('my-paint', MyPaint);

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Load Worklet if ('paintWorklet' in CSS) { CSS.paintWorklet.addModule('my-paint'); }

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Use Worklet .circle { background: #999 paint(my-paint); }

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QR Code

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Chart

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WebAssembly

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WASM - binary instruction format for a stack-based VM

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WHAT ?!

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WTF ?!

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WAT WebAssembly Text Format

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Devs are Good in Naming

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Available Options • Rust • C/C++ • TypeScript via AssemblyScript

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Install yarn add AssemblyScript/assemblyscript

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Init npx asinit .

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Build yarn asbuild

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Basic function import "allocator/tlsf"; export function add(a: i32, b: i32): i32 { return a + b; }

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Load WASM module import { instantiateStreaming, ASUtil } from "assemblyscript/lib/loader"; interface MyApi { add(a: number, b: number): number; } const imports: any = {}; async function main(): void { var interop: ASUtil = await instantiateStreaming(fetch("../build/untouched.wasm"), imports); console.log("The result is:", interop.add(1, 2)); }

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Running in Parallel Performance of Heavy Tasks

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@bobrov1989 https://bobrov.dev Vitalii Bobrov