nodejs process model Node.js

Node.js uses a single-threaded, event-driven architecture that is designed to handle a large number of concurrent connections with minimal overhead. This model is sometimes referred to as the "event loop" model.

At the heart of this model is the Node.js event loop, which is responsible for processing events such as incoming network connections or file system operations. When an event occurs, Node.js adds it to a queue and begins processing the next event in the queue.

Because Node.js uses a single thread to handle all events, it can be very efficient when dealing with I/O-bound tasks, such as reading and writing to the file system or making network requests. However, because it is single-threaded, Node.js is not well-suited for CPU-bound tasks that require heavy processing.

To overcome this limitation, Node.js provides a mechanism for running CPU-bound tasks in separate processes or threads. This can be achieved using the child_process module or the worker_threads module, which allow developers to spawn child processes or worker threads to perform parallel processing.