@roots/bud-build/lib/config/parallelism.js

bud.js core module

import { cpus } from 'node:os';
export const parallelism = async ({ build, hooks, root, }) => {
    const concurrency = 100;
    const cores = Math.max(cpus().length, 1);
    const available = cores * concurrency;
    const compilations = Math.max(Object.keys(root.children ?? []).length, 1);
    const parallelism = Math.max(Math.floor(available / compilations), 1);
    build.logger.info(`parallelism set to`, parallelism);
    return hooks.filter(`build.parallelism`, parallelism);
};