binary-trees Node js program

/* The Computer Language Benchmarks Game
 * https://salsa.debian.org/benchmarksgame-team/benchmarksgame/
 *
 * contributed by François Pirsch
 * Based on the node.js program from Léo Sarrazin and Andrey Filatkin
*/

const { Worker, isMainThread, parentPort, workerData } = require('worker_threads');

if (isMainThread) {
    mainThread();
} else {
    workerThread();
}

async function mainThread () {
    const maxDepth = Math.max(6, +process.argv[2] || 0);
    const stretchDepth = maxDepth + 1;
    const tasks = [{ iterations: 1, depth: stretchDepth }];

    const longLivedTree = createTree(maxDepth);

    for (let depth = 4; depth <= maxDepth; depth += 2) {
        const iterations = 1 << maxDepth - depth + 4;
        tasks.push({ iterations, depth });
    }

    (await runTasks(tasks)).forEach(result => process.stdout.write(result));

    process.stdout.write(
        `long lived tree of depth ${maxDepth}\t check: ${checksum(longLivedTree)}\n`
    );
}

function runTasks (tasks) {
    return new Promise(resolve => {
        const results = [];
        let tasksRemaining = tasks.length;
        for (let i = 0; i < tasks.length; i++) {
            new Worker(__filename, { workerData: tasks[i] })
            .on('message', message => {
                results[i] = message;
                tasksRemaining--;
                if (tasksRemaining === 0) {
                    resolve(results);
                }
            });
        }
    });
}

function workerThread () {
    const { iterations, depth } = workerData;
    let check = 0;
    for (let i = 0; i < iterations; i++) {
        check += checksum(createTree(depth));
    }
    parentPort.postMessage(
        iterations === 1
        ? `stretch tree of depth ${depth}\t check: ${check}\n`
        : `${iterations}\t trees of depth ${depth}\t check: ${check}\n`
    );
}

function checksum (node) {
    if (!node.left) {
        return 1;
    }
    return 1 + checksum(node.left) + checksum(node.right);
}

function createTree (depth) {
    return depth-- > 0
        ? { left: createTree(depth), right: createTree(depth) }
        : { left: null, right: null };
}
    

NOTES:
64-bit Ubuntu quad core
v14.2.0


Thu, 07 May 2020 01:38:10 GMT

MAKE:
cp -L binarytrees.node binarytrees.js

0.15s to complete and log all make actions

COMMAND LINE:
/opt/src/node-v14.2.0-linux-x64/bin/node binarytrees.js 21

PROGRAM OUTPUT:
stretch tree of depth 22	 check: 8388607
2097152	 trees of depth 4	 check: 65011712
524288	 trees of depth 6	 check: 66584576
131072	 trees of depth 8	 check: 66977792
32768	 trees of depth 10	 check: 67076096
8192	 trees of depth 12	 check: 67100672
2048	 trees of depth 14	 check: 67106816
512	 trees of depth 16	 check: 67108352
128	 trees of depth 18	 check: 67108736
32	 trees of depth 20	 check: 67108832
long lived tree of depth 21	 check: 4194303