Introduction to the features of WorkerMan

Workerman is an open source high-performance asynchronous PHP socket instant messaging framework. This article will introduce some features of Workerman to you. I hope it will be helpful to everyone.

Related recommendations: "workerman Tutorial"

Introduction to the features of WorkerMan:

1. Pure PHP development

Applications developed using WorkerMan can run independently without relying on containers such as php-fpm, apache, and nginx. This makes it very convenient for PHP developers to develop, deploy, and debug applications.

2. Support PHP multi-process

In order to give full play to the performance of the server's multi-CPU, WorkerMan supports multi-process and multi-tasking by default. WorkerMan starts a main process and multiple sub-processes to provide external services. The main process is responsible for monitoring the sub-processes. The sub-processes independently monitor network connections and receive, send and process data. Due to the simple process model, WorkerMan is more stable and efficient.

3. Supports TCP and UDP

WorkerMan supports two transmission protocols, TCP and UDP. You only need to change one attribute to change the transport layer protocol, and the business code does not need to be changed.

4. Support long connections

Many times require PHP applications to maintain long connections with clients, such as chat rooms, games, etc., but traditional PHP containers (apache, nginx, php- fpm) is difficult to do.

Using WorkerMan, as long as the server business does not actively call the close connection interface, you can use PHP long connection. A single WorkerMan process can support tens of thousands of concurrent connections, and multiple processes can support hundreds of thousands or even millions of concurrent connections.

5. Support various application layer protocols

The WorkerMan interface supports various application layer protocols, including custom protocols. Changing the protocol in WorkerMan is also very simple. It only requires configuring a field, and the protocol is automatically switched without any changes to the business code. You can even open multiple ports with different protocols to meet different client needs.

6. Support high concurrency.

WorkerMan supports Libevent event polling library (Libevent extension needs to be installed). Using Libevent has excellent performance in high concurrency. If Libevent is not installed, use PHP built-in Select related system calls, the performance is also very powerful.

7. Support smooth service restart

When the service needs to be restarted (such as releasing a version), we do not want the process that is processing user requests to be terminated immediately, let alone the moment of restart. Client communication failed.

WorkerMan provides a smooth restart function, which can ensure smooth upgrade of services without affecting the use of clients.

8. Support file update detection and automatic loading

During the development process, we hope that after we change the code, it will take effect immediately so that we can view the results. WorkerMan provides the FileMonitor file monitoring component. As long as the file is updated, WorkerMan will automatically run reload to load the new file and make it effective.

9. Supports running sub-processes as specified users

Because the sub-process is the process that actually handles user requests, for security reasons, the sub-process cannot have too high permissions, so WorkerMan supports setting sub-processes. Run processes run as the same user, making your server more secure.

10. Support objects or resources to be maintained permanently

WorkerMan will only load and parse the PHP file once during the running process, and then it will reside in the memory. This makes class and function declarations, PHP execution environment , symbol tables, etc. will not be repeatedly created and destroyed, which is completely different from the PHP mechanism running under the web container.

In WorkerMan, static members or global variables are maintained permanently during the life cycle of a process without being actively destroyed. That is, if resources such as objects or connections are placed in global variables or class static members, All requests within the entire life cycle of the current process can be reused.

For example, as long as a database connection is initialized once in a single process, all subsequent requests of this process can reuse this database connection, avoiding the TCP three-way handshake, database permission verification, and disconnection during frequent database connections. The TCP four-way handshake process greatly improves application efficiency.

11. High performance

Since the PHP file is read and parsed from the disk once, it will be resident in the memory. The next time it is used, the opcode in the memory will be used directly, which greatly reduces the disk IO. And many time-consuming processes in PHP such as request initialization, creation of execution environment, lexical parsing, syntax parsing, compiling opcode, request closing, etc., and does not rely on containers such as nginx and apache. It reduces the overhead of communication between nginx and other containers and PHP. The most important thing is The resources can be maintained permanently, and there is no need to initialize the database connection every time, so using WorkerMan to develop applications has very high performance.

12. Support HHVM

Support running on HHVM virtual machine, which can double the performance of PHP. Especially in CPU-intensive computing business, the performance is very excellent. Through actual stress test comparison, when there is no load business, the network throughput of WorkerMan running under HHVM is about 30-80% higher than running under Zend PHP5.6

Reference Document

http://doc.workerman.net/principle.html

Original link: https://blog.csdn.net/u012164509/article/details/90749646

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