Why is Swoole fast?

Swoole is PHP's asynchronous, parallel, high-performance network communication engine, written in pure C language, providing an asynchronous multi-threaded server in PHP language, asynchronous TCP /UDP network client, asynchronous MySQL, asynchronous Redis, database connection pool, AsyncTask, message queue, millisecond timer, asynchronous file reading and writing, asynchronous DNS query. Swoole has built-in Http/WebSocket server/client and Http2.0 server.

# SWOOLE engine's advantages (Recommended learning: SWOOLE Video Tutorial )

## stereotypes in memory. In traditional PHP frameworks or single files, before processing each request, the operations of loading the framework file and configuration must be done. After the request is completed, all resources and memory will be released, so there is no need to worry about memory leaks. However, if the number of requests increases and concurrency is high, resources are created quickly and released immediately, which will cause the operating efficiency of the PHP program to drop sharply.

Using Swoole does not have this problem: after the PHP code is loaded into the memory, it has a longer life cycle, so the database connection and other large objects established in this way will not be released.

Each request only needs to process a small amount of code, and these codes are only compiled by the PHP parser and reside in memory the first time it is run. In the future, OPCODE will be loaded directly to let the Zend engine run directly.

In addition, things that

PHP could not implement before, such as database connection pool and cache connection pool, can be implemented under the Swoole engine. The operating efficiency of the system will be greatly improved.

Rapid development. The Swoole engine provides an asynchronous multi-threaded server in PHP language, asynchronous TCP/UDP network client, asynchronous MySQL, asynchronous Redis, database connection pool, AsyncTask, message queue, millisecond timer, asynchronous file reading and writing, and asynchronous DNS query.

Swoole has built-in Http/WebSocket server/client and Http2.0 server.

Coroutine programming model.

Swoole4 can implement asynchronous programs using fully synchronous code. There is no need to add any additional keywords to the PHP code. The bottom layer automatically performs coroutine scheduling to implement asynchronous IO.

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