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现代方式使用asyncio

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November 25, 2018
Programming
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 现代方式使用asyncio

使用Python asyncio的一些姿势

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ipfans

November 25, 2018

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Transcript

  1. 现代⽅方式使⽤用asyncio Kevin

  2. None

  3. asyncio • 为什什么我们需要异步？ • 为什什么选择asyncio？ • 如何优雅的编写asyncio程序？ • asyncio的其他

  4. asyncio • 为什什么我们需要异步？ • 为什什么选择asyncio？ • 如何优雅的编写asyncio程序？ • asyncio的其他

  5. asyncio • 为什什么我们需要异步？ • 为什什么选择asyncio？ • 如何优雅的编写asyncio程序？ • asyncio的其他

  6. gevent/eventlet

  7. gevent/eventlet

  8. 相⽐比gevent • 官⽅方⽀支持，未来的⽅方向 • 显式切换 • 显式处理理条件竞争问题更更容易易 • 显式控制上下⽂文切换，不不再踩坑 •

    更更容易易兼容

  9. asyncio • 为什什么我们需要异步？ • 为什什么选择asyncio？ • 如何优雅的编写asyncio程序？ • asyncio的其他

  10. 举个例例⼦子

  11. 举个例例⼦子

  12. 举个例例⼦子

  13. run&serve_forever

  14. asyncio API

  15. asyncio API • 优先使⽤用⾼高级API，提供更更简单的使⽤用⽅方法 • 只有在需要时，才选择使⽤用底层API

  16. 再举个例例⼦子

  17. gather

  18. contextvar

  19. contextvar

  20. async传染

  21. async传染

  22. async传染

  23. async传染

  24. Django Channels

  25. flask

  26. responder

  27. asyncio调试 https://docs.python.org/3/library/asyncio-dev.html#debug-mode

  28. aiomonitor

  29. aiomonitor

  30. asyncio • 为什什么我们需要异步？ • 为什什么选择asyncio？ • 如何优雅的编写asyncio程序？ • asyncio的其他

  31. 其他：优化 • uvloop • 新版本也是⼀一种优化：

  32. 其他：注意事项 • 单独使⽤用asyncio仍旧是单线程模型 • 只有IO才可以并发 • asyncio会带来CPU压⼒力力 • event loop和上下⽂文切换在⾼高并发场景下仍旧有明显消耗

  33. Thank You！