In the event the request is blocking, requiring I/O operations, the request will be sent to a worker thread pool. If the request is non-blocking, it does not involve any long-running processes or data requests, the response will be immediately prepared and then sent back to the client. There are two scenarios that will occur depending on the nature of the request. The event loop continuously runs, receiving requests from the event queue. Node.js uses an event loop to listen for events to be raised for an asynchronous job. When a request comes in, it will be placed in an event queue. One advantage of this is that Node.js requires far fewer resources. The Node.js process model differs from traditional web servers in that Node.js runs in a single process with requests being processed on a single thread. Source: TutorialsTeacher The Node.js Process Model In this way, the web server model is synchronous, or blocking. In the event a request is received and a thread is not available, the request will have to wait until a previous request finishes, a response is returned, and the thread is returned to the thread pool. Each time a new request comes in, it is assigned to a different thread in the pool. The traditional web server model consists of a pool of threads which may process requests. Node.js may be run on Windows, MAC, or Linux systems.The asynchronous nature of Node.js leads to increased performance over other frameworks.Any other modules required by the application may be easily installed. It includes only the core modules needed to function. The runtime environment itself is very lightweight.Using Node.js we are able to build entire server-side applications using only JavaScript.Anyone is able to proposed modifications or improvements. Node.js is open-source meaning it has been made freely available to developers all over the world.The popularity of Node.js can be attributed to a couple of stand-out advantages, some of them alluded to in the previous section. Node.js can be used to create scalable, server-side applications using JavaScript, including command-line applications, web applications, real-time chat applications, REST API servers, as well as network programs like web servers. We will see that this asynchronous, or non-blocking, behavior is key in advantages over the traditional web server model. At its core, Node.js is event-driven and possess asynchronous behavior by default. It is open-source under the MIT license and has cross-platform functionality meaning that it may be used on Windows, MAC, and Linux. Node.js may be run outside of the browser and is thus very performant. Node.js is a server-side runtime environment that runs on Chrome’s V8 JavaScript engine. Here we will cover a brief introduction to Node.js, some of its advantages, and finally the Node.js process model. One such theoretical fundamental is the Node.js process model and how it compares to the traditional web server model. Being a technology that I would like to become more proficient in, I decided it was time to start from scratch and learn some of the fundamentals. I must admit, I did this with little understanding of Node.js itself. I’ve only dabbled in Node.js here and there, building small projects and demos for blog posts.
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