Why should php use swoole

First of all, we need to know that Swoole is a network application development tool that supports Http, TCP, UDP, and WebSocket.

The reasons for use are as follows:

1. Resident in memory to avoid performance losses caused by repeated loading and improve massive performance.

2. Coroutine asynchronously improves the concurrent processing capabilities of I/O-intensive scenarios (such as WeChat development, payment, login, etc.).

3. Conveniently develop Http, WebSocket, TCP, UDP and other applications, which can communicate with hardware.

4. PHP high-performance microservice architecture has become a reality.

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Resident memory

The current traditional PHP framework, before processing each request, You have to do the operations of loading framework files and configuration. This may have become a big cause of performance issues, but with Swoole there is no such problem, once loaded and used many times.

Coroutines

When it comes to coroutines, we must first briefly talk about processes and threads. As we all know, processes occupy a lot of resources. Creating a large number of processes in order to process requests is definitely not worth the gain. There are many multi-threaded applications. At the CPU level, several cores will perform several tasks. Once too many threads are created, there will be a loss in thread scheduling.

Coroutines are implemented on a single-thread basis, which can maximize the use of CPU resources without wasting them while waiting for I/O. Of course, the more coroutines, the more memory they occupy, but this is acceptable. Compared with processes and threads, the resources occupied are relatively small.

When using coroutines, when encountering scenarios such as reading and writing files, requesting interfaces, etc., the coroutines will be automatically suspended and the CPU will be given to other coroutines to perform tasks. This can improve single-threaded CPU resource utilization. Reduce waste, thereby improving performance.

Coroutine code example:

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