How Does Async Work? - Speaker Deck

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How does  Async   work? 1

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~ Matthias Endler ~ 2

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~ Matthias Endler ~ Backend engineer at trivago 2

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~ Matthias Endler ~ Backend engineer at trivago Mostly Go, Rust, Python 2

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~ Matthias Endler ~ Backend engineer at trivago Mostly Go, Rust, Python Interested in low level stuff 2

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~ Matthias Endler ~ Backend engineer at trivago Mostly Go, Rust, Python Interested in low level stuff endler.dev and Hello-rust.show 2

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4 move

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4 move

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4 move

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4 move

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~ Python ~ 5

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Python's asyncio * coroutines * tasks * event loop * select 11

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13 coroutine

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14 coroutine asyncio.gather( )

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14 coroutine Task

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15 asyncio.run( )

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15 Task

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18 select kernel userspace

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18 select kernel userspace

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18 select kernel userspace

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18 select kernel userspace

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18 select kernel userspace

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18 select kernel userspace

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18 select kernel userspace

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18 select kernel userspace

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~ JavaScript ~ 22

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Async JavaScript * Callbacks * Promises * async/await 23

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JavaScript Callbacks * The problem * The solution 24

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26 v8

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26 v8 Spidermonkey

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26 v8 Spidermonkey Chakra core

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27 Heap Stack Web apis setTimeout dom ajax callback queue Event  loop

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28 Heap Stack Web apis setTimeout dom ajax callback queue Event  loop

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28 Heap Stack Web apis setTimeout dom ajax callback queue Event  loop

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29 Heap Stack Web apis setTimeout dom ajax callback queue Event  loop

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29 Heap Stack Web apis setTimeout dom ajax callback queue Event  loop

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30 Heap Stack Web apis setTimeout dom ajax callback queue Event  loop

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30 Heap Stack Web apis setTimeout dom ajax callback queue Event  loop

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31 Heap Stack Web apis setTimeout dom ajax callback queue Event  loop

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31 Heap Stack Web apis setTimeout dom ajax callback queue Event  loop

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32 Stack Web apis setTimeout dom ajax callback queue Event  loop

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33 Stack Web apis setTimeout dom ajax callback queue Event  loop main

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34 Stack Web apis setTimeout dom ajax callback queue Event  loop main console.log

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35 Stack Web apis setTimeout dom ajax callback queue Event  loop One main

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36 Stack Web apis setTimeout dom ajax callback queue Event  loop One main SetTimeout

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37 Stack Web apis setTimeout dom ajax callback queue Event  loop main cb One

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37 Stack Web apis setTimeout dom ajax callback queue Event  loop main cb One

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38 Stack Web apis setTimeout dom ajax callback queue Event  loop One main cb console.log

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39 Stack Web apis setTimeout dom ajax callback queue Event  loop One three cb

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40 Stack Web apis setTimeout dom ajax callback queue Event  loop One three cb

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40 Stack Web apis setTimeout dom ajax callback queue Event  loop One three cb

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41 Stack Web apis setTimeout dom ajax callback queue Event  loop One three two

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42 v8 Spidermonkey Chakra core

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42 v8 Spidermonkey Chakra core Node.js

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44 Everything You Need to Know About Node.js Event Loop

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~ Rust ~ 48

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What is Rust? Empowering everyoneto build  reliable and efficient software. 49

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What is Rust? * Systems programming language * Started at Mozilla (firefox) * used by Amazon/Microsoft/Dropbox... * Main goals: safety, performance * fearless concurrency 50

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52 Future

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56 start open print error

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requests/s 57 2.000.000 1.500.000 1.000.000 500.000 0 Rust  (minihttp) java  (rapidoid) go  (fasthttp) go  (stdlib) node.js  (stdlib)

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Futures in Rust 59 mio tokio futures async/await select/epoll/kqueue Operating system external crates standard library

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Summary * asyncio in Python is based on coroutines * async in javascript is based on callbacks * Rust's futures are zero-cost 60

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Credits * Pixel backgrounds by slance.com * Truck and engine logos by Pixelart maker * Jake Archibald - in the loop 61