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现代方式使用asyncio
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ipfans
November 25, 2018
Programming
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现代方式使用asyncio
使用Python asyncio的一些姿势
ipfans
November 25, 2018
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Transcript
现代⽅方式使⽤用asyncio Kevin
None
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
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
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
gevent/eventlet
gevent/eventlet
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
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
举个例例⼦子
举个例例⼦子
举个例例⼦子
run&serve_forever
asyncio API
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
再举个例例⼦子
gather
contextvar
contextvar
async传染
async传染
async传染
async传染
Django Channels
flask
responder
asyncio调试 https://docs.python.org/3/library/asyncio-dev.html#debug-mode
aiomonitor
aiomonitor
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
其他:优化 • uvloop • 新版本也是⼀一种优化:
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
Thank You!