The PHP process pool is a server-side technology that pre-starts a certain number of PHP processes to reduce the overhead of re-creating the process for each request processing, thereby improving the server's performance and response speed.
Normally, when a client request arrives at the server, the server needs to create a new process to handle the request. This process involves a series of overheads such as resource allocation and initialization of the operating system. If the request volume is high, this process can greatly affect server performance. The PHP process pool is designed to solve this problem.
The underlying principle of the PHP process pool is to create a certain number of PHP processes in advance and save them in the process pool. When a request arrives at the server, the PHP process pool selects an idle PHP process from the process pool to handle the request, instead of creating a new process each time. When a request is processed, the PHP process will return to the process pool and wait for the next request to arrive.
By using the PHP process pool, you can significantly reduce the time and resources required by the server to process each request, and improve the server's concurrent processing capabilities and stability. However, it should be noted that the design and configuration of the PHP process pool need to take into account the server's hardware resources and the actual request volume, otherwise it may have adverse effects.