Is it necessary to use swoole in php?

The self-introduction on Swoole's official website is "PHP asynchronous network communication engine for production environments". First of all, Swoole is a network application development tool that supports Http, TCP, UDP, WebSockets. (Recommended learning: swoole video tutorial)

There are differences between Swoole and our traditional PHP development, and there are also concepts that need to be understood. If you use some current Swoole-based frameworks to develop, the development habits are similar to the traditional TP and LV frameworks.

So why use Swoole?

I think there are the following points:

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

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

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

PHP High-performance microservice architecture has become a reality

Resident memory

The current traditional PHP framework processes each request Before, you have to do the operations of loading the framework file 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

Speaking of coroutines, we must first briefly talk about processes and threads. As we all know, processes occupy a lot of resources. A large number of processes must be created to handle requests. It’s 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:

<?php
use Swoole\Coroutine as co;
  
// 协程
$time = microtime(true);
// 创建10个协程
for($i = 0; $i < 10; ++$i)
{
    // 创建协程
    go(function() use($i){
        co::sleep(1.0); // 模拟请求接口、读写文件等I/O
        echo $i, PHP_EOL;
    });
}
swoole_event_wait();
echo &#39;co time:&#39;, microtime(true) - $time, &#39; s&#39;, PHP_EOL;
  
// 同步
$time = microtime(true);
// 创建10个协程
for($i = 0; $i < 10; ++$i)
{
    sleep(1); // 模拟请求接口、读写文件等I/O
    echo $i, PHP_EOL;
}
echo &#39;sync time:&#39;, microtime(true) - $time, &#39; s&#39;, PHP_EOL;

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