How does swoole solve high concurrency?

1. Introduction to swoole

Swoole is an extension of PHP.

Simple understanding: swoole=asynchronous I/O network communication

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

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2. How swoole handles high concurrency

①Reactor model introduction

IO multiplexing asynchronous non-blocking programs use the classic Reactor model. Reactor, as the name suggests, means reactor, and it does not process it itself Any data sent and received. 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 callback.

②Swoole's architecture

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

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