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This article mainly introduces "what is the applicable scenario of swoole collaboration". In daily operation, I believe that many people have doubts about what is the applicable scenario of swoole collaboration. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the doubts of "what is the applicable scenario of swoole collaboration?" Next, please follow the editor to study!

In swoole, cooperative programs can be used for highly concurrent services, the fault tolerance rate of using cooperative program mode services will be greatly increased, some interface failures will not lead to service collapse, and can also be used for instant messaging chat, which can ensure that the communication is completely non-blocking, and every message can be processed immediately.

Operating environment of this tutorial: Windows10 system, Swoole4 version, DELL G3 computer

What can swoole collaborate do?

The applicable scenario of the collaborative process

For high concurrent services, such as second-kill system, high-performance API interface and RPC server, the fault tolerance rate of services will be greatly increased by using cooperative program mode, and the failure of some interfaces will not lead to the collapse of the whole service.

Crawlers, which can achieve great concurrency, can make efficient use of bandwidth even in very slow network environments.

Instant messaging services, such as IM chat, game servers, the Internet of things, message servers, and so on, ensure that message communication is completely non-blocking and that each message packet can be processed instantly.

What is a cooperative process?

Coroutine, also known as user-mode threads, switches through collaboration rather than preemption. Compared with the process or thread, all the operations of the cooperative program can be done in the user mode, and the cost of creation and switching is lower. Collaborative process is a supplement to the process, or a complementary relationship.

To understand what is "user-mode thread", it is necessary to understand what "kernel-mode thread" is. Kernel threads are scheduled by the operating system. When switching thread context, first save the context of the previous thread, and then execute the next thread. When the conditions are met, switch back to the previous thread and restore the context. The same is true of collaborative programs, except that user-mode threads are not scheduled by the operating system, but by programmers, that is, the so-called user-mode threads.

The difference between a cooperative program and a thread

The co-program of Swoole is single-threaded in the underlying implementation, so only one co-program is working at a time, and the execution of the co-program is serial. Unlike threads, multiple threads are scheduled by the operating system to execute in parallel with multiple CPU.

When one co-program is running, other co-programs stop working. The current protocol hangs when it performs a blocking IO operation, and the underlying scheduler enters the event loop. When there is an IO completion event, the underlying scheduler resumes the execution of the corresponding co-program.

The utilization of CPU multicore still depends on the multi-process mechanism of Swoole engine.

At this point, the study on "what is the applicable scenario of swoole cooperation program" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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