Can swoole handle concurrency?

swoole introduction

swoole is an extension of PHP.                                                                                                                                                                                                        (Recommended learning: swoole video tutorial )

Simple understanding: swoole = asynchronous I/O network communication

PHPer can use swoole to implement functions that PHP could not achieve in the past.

How swoole handles high concurrency

①Reactor model introduction

IO multiplexing asynchronous non-blocking program uses classic The Reactor model, as the name suggests, Reactor means reactor. It does not process any data sending and receiving itself. It can only monitor the event changes of a socket (can also be a pipe, eventfd, signal) handle.

Reactor is just an event generator. The actual operations on the socket handle, such as connect/accept, send/recv, and close, are completed in the callback.

②Swoole's architecture

swoole uses multi-threaded Reactor and multi-process Worker. Because reactor is based on epoll, each reactor can handle countless connections. ask. In this way, swoole can easily handle high concurrency.

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How swoole implements asynchronous I/O

One is an ordinary worker process and the other is a task worker process .

The worker process is used to process ordinary requests that do not take too long; the task worker process is used to process requests that take a long time, such as database I/O operations.

The difference between workerman and swoole: swoole extension is written in c language and is not restricted by the environment, while workerman depends on the linux environment.

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