An overview of the

  • Reactor thread models can be divided into the following categories

    • Single Reactor Single thread

    • Single Reactor multithreading

    • Multireactor multithreading

Single Reactor Single thread

  • Features:

    • A single thread does all the work of establishing a connection, processing the request, and sending back the request

  • Disadvantages:

    • Unable to utilize multi-core CPUS
    • Because it is single-threaded, if a request takes too long to process, it will block for a long time

  • Advantages:

    • Single thread running, no locking, all operations are serial

  • Application: Redis thread model

Single Reactor multithreading

  • Features:
    • The Reactor is a master thread that processes event-generating sockets and distributes them to the corresponding processors
    • The corresponding processor will use the thread pool implementation, multithreading processing
  • Disadvantages:

    • There are data security issues, multithreading

    • The main thread needs to handle all network events, which can easily cause congestion during high concurrency!

Multireactor multithreading

  • Features:
    • The main thread is used to establish a connection, bind the socket to another thread, and then the main thread is left alone. Subsequent NETWORK I/O events are handled by the thread to which the socket is bound
  • Application:

    • Nginx Reactor Multiple processes

    • Netty Multiple Reactor Multiple threads

Reference:

Mp.weixin.qq.com/s/px6-YnPEU…