[Solved] You want to create a Node.js cluster that forks a worker for each CPU core and logs each worker's process ID. Which code snippet correctly achieves this? | Node.js

Node.js - Cluster Module

You want to create a Node.js cluster that forks a worker for each CPU core and logs each worker's process ID. Which code snippet correctly achieves this?

Aconst cluster = require('cluster'); const os = require('os'); if (cluster.isMaster) { const cpus = os.cpus().length; for (let i = 0; i < cpus; i++) { const worker = cluster.fork(); console.log(`Worker ${worker.process.pid} started`); } }

Bconst cluster = require('cluster'); if (cluster.isWorker) { console.log(`Worker ${process.pid} started`); } else { cluster.fork(); }

Cconst cluster = require('cluster'); const os = require('os'); if (cluster.isMaster) { cluster.fork(os.cpus().length); }

Dconst cluster = require('cluster'); if (cluster.isMaster) { for (let i = 0; i < 4; i++) { cluster.fork(); } console.log('Workers started'); }

Step-by-Step Solution

Solution:

Step 1: Use os.cpus().length to get CPU count
This is needed to fork one worker per CPU core.
Step 2: Fork workers in a loop and log each worker's PID
const cluster = require('cluster'); const os = require('os'); if (cluster.isMaster) { const cpus = os.cpus().length; for (let i = 0; i < cpus; i++) { const worker = cluster.fork(); console.log(`Worker ${worker.process.pid} started`); } } correctly forks and logs each worker's process ID.
Step 3: Check other options for correctness
const cluster = require('cluster'); if (cluster.isWorker) { console.log(`Worker ${process.pid} started`); } else { cluster.fork(); } forks only one worker, C incorrectly calls fork with argument, D forks 4 workers but does not log PIDs.
Final Answer:
Option A correctly forks per CPU and logs worker PIDs -> Option A
Quick Check:
Fork per CPU and log PID = const cluster = require('cluster'); const os = require('os'); if (cluster.isMaster) { const cpus = os.cpus().length; for (let i = 0; i < cpus; i++) { const worker = cluster.fork(); console.log(`Worker ${worker.process.pid} started`); } } [OK]

Quick Trick: Use os.cpus().length and loop to fork workers [OK]

Common Mistakes:

Calling cluster.fork with arguments
Not logging worker PIDs
Forking fixed number without CPU count

Master "Cluster Module" in Node.js

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You want to create a Node.js cluster that forks a worker for each CPU core and logs each worker's process ID. Which code snippet correctly achieves this?

Step 1: Use os.cpus().length to get CPU count

Step 2: Fork workers in a loop and log each worker's PID

Step 3: Check other options for correctness

Final Answer:

Quick Check:

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