Concurrency

Parallelism

• One task in multiprocessor, map the task to the multiple nodes and reduce the results into one node after the computation
• Usually is used on the complex computation or large simulation

Asynchronous

Coroutine

• Why we need coroutine?
  • If we handle the IO bound through the multiple blocking system call directly, we would increase the frequency of the context switch
  • A lightweight mechanism to switch between the IO operation in single thread at programmer perspective
  • Avoid the overhead of the context switch caused by OS
• What does coroutine do?
  • Hang on the IO bound task with non-blocking system call
  • While we waiting on the gathered hang on tasks, we check the status in event loop continuously

Publisher Subscriber

• Use event broker to decouple the publisher and subscriber

Producer Consumer

• The communication between producer and consumer is not restrict in message queue, it also could be just a in-memory buffer to exchange the event message for increasing the performance