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Today, I would like to share with you the relevant knowledge about whether the swoole protocol is a process or a thread. The content is detailed and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article.

The swoole co-program belongs to the thread. The co-program is executed in the thread, the co-program is a lightweight thread, the Swoole co-program is single-threaded in the underlying implementation, only one co-program is working at a time, and the thread will be scheduled to multiple CPU parallel execution by the operating system.

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

Whether the swoole protocol belongs to a process or a thread

What is the process?

A process is a running program in the system, and once a program is run, it is a process.

A process can be seen as an example of program execution.

Tags: one process cannot access another process's variables and data structures. If you want one process to access another process's resources, you need to use inter-process communication, such as pipes, files, sockets, etc.

What is a thread?

Threads belong to the process and are the executors of the program.

A process contains at least one main thread, or there can be more child threads, each using the stack space of the process to which it belongs.

A thread is an entity of a process and an execution path of a process.

Tags: multiple threads within the same process share part of the state, and multiple threads can read and write the same block of memory.

What is a cooperative journey?

The cooperative program is more abstract, which is a certain scheduling mechanism within the program.

The co-program is a lightweight thread, the creation, switching, suspension and destruction of the co-program are all memory operations, and the consumption is very low.

The co-program belongs to the thread, and the co-program is executed in the thread.

The scheduling of the cooperative program is manually switched by the user, so it is also called the user space thread.

The scheduling strategy of collaborative process is: collaborative scheduling.

The difference between a co-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.

Applicable scenarios for collaborative programs:

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.

These are all the contents of the article "whether swoole is a process or a thread". Thank you for reading! I believe you will gain a lot after reading this article. The editor will update different knowledge for you every day. If you want to learn more knowledge, please pay attention to the industry information channel.

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