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refactor(@angular-devkit/build-angular): improve performance of paral…
…lel bundle processing
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53 changes: 53 additions & 0 deletions
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packages/angular_devkit/build_angular/src/browser/action-executor.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,53 @@ | ||
| /** | ||
| * @license | ||
| * Copyright Google Inc. All Rights Reserved. | ||
| * | ||
| * Use of this source code is governed by an MIT-style license that can be | ||
| * found in the LICENSE file at https://angular.io/license | ||
| */ | ||
| import JestWorker from 'jest-worker'; | ||
| import * as os from 'os'; | ||
|
|
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| export class ActionExecutor<Input extends { size: number }, Output> { | ||
| private largeWorker: JestWorker; | ||
| private smallWorker: JestWorker; | ||
|
|
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| private smallThreshold = 32 * 1024; | ||
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| constructor(actionFile: string, private readonly actionName: string) { | ||
| // larger files are processed in a separate process to limit memory usage in the main process | ||
| this.largeWorker = new JestWorker(actionFile, { | ||
| exposedMethods: [actionName], | ||
| }); | ||
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| // small files are processed in a limited number of threads to improve speed | ||
| // The limited number also prevents a large increase in memory usage for an otherwise short operation | ||
| this.smallWorker = new JestWorker(actionFile, { | ||
| exposedMethods: [actionName], | ||
| numWorkers: os.cpus().length < 2 ? 1 : 2, | ||
| // Will automatically fallback to processes if not supported | ||
| enableWorkerThreads: true, | ||
| }); | ||
| } | ||
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| execute(options: Input): Promise<Output> { | ||
| if (options.size > this.smallThreshold) { | ||
| return ((this.largeWorker as unknown) as Record<string, (options: Input) => Promise<Output>>)[ | ||
| this.actionName | ||
| ](options); | ||
| } else { | ||
| return ((this.smallWorker as unknown) as Record<string, (options: Input) => Promise<Output>>)[ | ||
| this.actionName | ||
| ](options); | ||
| } | ||
| } | ||
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| executeAll(options: Input[]): Promise<Output[]> { | ||
| return Promise.all(options.map(o => this.execute(o))); | ||
| } | ||
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| stop() { | ||
| this.largeWorker.end(); | ||
| this.smallWorker.end(); | ||
| } | ||
| } |
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