单线读取PHP，例如Dart或nodejs
我有一个服务a功能相当有限的功能：当客户端请求时，它只是将请求发送到服务b。这可能需要花费很多时间：Service A等待Service B大多数时间（〜99％）的响应。如果我从头开始编写它，我会使用一些单线程环境（例如Dart或Node），但问题在于它是用PHP编写的。因此，每个HTTP请求都会产生一个子过程，并且每个请求都使用一个CPU。因此，没有充分的理由使用大量的CPU：他们每个人只需等待Service b的响应。
这是我所拥有的图像：
相反，我宁愿有一个带有一个线程的过程，例如在nodejs中：
那么，我的问题是，当仅使用单个CPU时，我该如何实现这种nodejs的行为？
我已经检查了一些异步库，例如swoole，reactphp，amphp等，但是它们大多提到多路复用，例如当我有几个并发请求时，我可以同时发送，而不是顺序发送它们。但这不是我需要的。
那么，我有什么选择？
I have a service A with pretty limited functionality: when clients request it, it just sends a request to service B. It can take quite some time: service A waits for a response from service B most (~99%) of the time. If I'd written it from scratch, I would have used some single-threaded environment like dart or node, but the problem is that it's written in php. So a child process is spawned per each http request, and each of them utilizes one CPU. So huge amount of CPUs is utilized for no good reason: each of them just waits for a response from service B.
Here is an image elaborating on what I have:
Instead, I'd rather have a single process with a single thread, like in NodeJS:
So, my question is how can I achieve this nodeJS-like behavior, when only single CPU is used?
I've checked some async libraries like swoole, reactphp, amphp, etc, but they mostly mention multiplexing, like when I have several concurrent requests and I can send them concurrently, not sequentially. But it's not what I need.
So, what options do I have?
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