Nginx Essentials

Allocating worker processes

We now consider recommendations on allocating worker processes. First, let's discuss a little bit about the background. Nginx is an asynchronous web server, which means actual input/output operations run asynchronously with the execution of a worker process. Each worker process runs an event loop that fetches all file descriptors that need processing using a special system call, and then services each of these file descriptors using nonblocking I/O operations. Hence, each worker process serves multiple connections.

In this situation, the time between an event occurs on a file descriptor, and this file descriptor can be serviced (that is latency) depends on how soon a full event processing cycle can be completed. Therefore, ...