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Thinktecture Webinar async/await in .NET
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Sebastian Gingter
May 19, 2021
Technology
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460
Thinktecture Webinar async/await in .NET
Slides for my webinar about async/await in .NET.
Sebastian Gingter
May 19, 2021
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Transcript
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2 Deep-dive in async/await bei Backend-APIs ▪ ▪ ▪ ▪
▪ ▪ ▪ ▪ ▪ Twitter:
3 ▪ 😨 ▪ ▪ ▪ ▪ ▪ Deep-dive in
async/await bei Backend-APIs
4 Deep-dive in async/await bei Backend-APIs
5 ▪ ▪ ▪ ▪ ▪ ▪ ▪ Deep-dive in
async/await bei Backend-APIs
6 Deep-dive in async/await bei Backend-APIs Kern 1 Kern 2
Kern 3 Kern 4 P2 T1 P2 T2 P3 T1 P1 T2 P3 T2 OS Scheduler P1 T1
7 • • • ▪ ▪ ▪ ▪ Deep-dive in
async/await bei Backend-APIs * Zahlen für Windows, Quelle: “Windows Internals“, Solomin, Russinovich et al. Jeffrey Richter sagt hingegen: 30 ms in Windows, Linux hat andere Zeiten…
8 • • • • • • • • •
• Deep-dive in async/await bei Backend-APIs
9 Deep-dive in async/await bei Backend-APIs Kern 1 Kern 2
Kern 3 Kern 4 P2 T1 P2 T2 P3 T1 P1 T1 P3 T2 P1 T2 Kontext-Wechsel Kontext- & Prozess-Wechsel
10 • • • • • • • • •
Deep-dive in async/await bei Backend-APIs ALU & FPU Registers 0 Registers 1 Classic CPU Core CPU Core with Hyper-Threading
11 Deep-dive in async/await bei Backend-APIs Kern 1 Kern 2
Kern 3 Kern 4 P2 T1 P2 T2 MyProc T1 P1 T2 P1 T1 MyProc T2 MyProc T3 MyProc T4 MyProc T5 MyProc T7 MyProc T6
12 Deep-dive in async/await bei Backend-APIs
13 Deep-dive in async/await bei Backend-APIs Task Task-Liste Threadpool T1
Threadpool T2 Kern 1 Kern 3 Kern 2 Kern 4 Threadpool T3 Threadpool T4 Threadpool Management Jeder Pool-Thread arbeitet Tasks in einer Endlosschleife ab Completed Tasks
14 • • • • • 🤯 Deep-dive in async/await
bei Backend-APIs
15 Deep-dive in async/await bei Backend-APIs
16 ▪ ▪ ▪ ▪ ▪ ▪ ⏳ ▪ ▪
▪ Deep-dive in async/await bei Backend-APIs ReadFile API: https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-readfile
17 ▪ ▪ ▪ ▪ ▪ ▪ ⏳ ▪ Deep-dive
in async/await bei Backend-APIs ReadFile API: https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-readfile
18 Deep-dive in async/await bei Backend-APIs
19 • • async Task<> MyMethodAsync() • • • await
OtherMethodAsync() • • await • • • • Deep-dive in async/await bei Backend-APIs
20 Deep-dive in async/await bei Backend-APIs
21 Deep-dive in async/await bei Backend-APIs
22 • • task.GetAwaiter().GetResult() → ❌ • Thread.Sleep() → ❌
• await Task.Delay() → ✔ • Thread.SpinWait() • → ❌ • → ✔ Deep-dive in async/await bei Backend-APIs
23 • • var task1 = DoSomethingAsync(); var task2 =
DoSomethingElseAsync(); await Task.WhenAll(task1, task2); • • • Task.Factory.StartNew(…, TaskCreationOptions.LongRunning); • • • Deep-dive in async/await bei Backend-APIs
24 • • • • Deep-dive in async/await bei Backend-APIs
25 Deep-dive in async/await bei Backend-APIs
26 ▪ ▪ ▪ ▪ ▪ ▪ Deep-dive in async/await
bei Backend-APIs
27 ▪ ▪ ▪ ▪ ▪ 😉 Deep-dive in async/await
bei Backend-APIs
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