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BASTA! 2021 - Deep Dive in async/await bei Back...
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Sebastian Gingter
September 21, 2021
Programming
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330
BASTA! 2021 - Deep Dive in async/await bei Backend-APIs
Slides zu meinem Vortrag auf der BASTA! 2021.
Sebastian Gingter
September 21, 2021
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Transcript
Thinktecture AG | Consultant
3 Deep-dive in async/await bei Backend-APIs
4 Deep-dive in async/await bei Backend-APIs ▪ ▪ ▪ ▪
▪ ▪ ▪ ▪ ▪ Twitter:
5 ▪ ▪ ▪ ▪ ▪ Deep-dive in async/await bei
Backend-APIs
6 ▪ ▪ ▪ ▪ ▪ ▪ Deep-dive in async/await
bei Backend-APIs
7 Deep-dive in async/await bei Backend-APIs Nein, aber effizienter!
8 Deep-dive in async/await bei Backend-APIs
9 ▪ ▪ ▪ ▪ ▪ ▪ ▪ Deep-dive in
async/await bei Backend-APIs
10 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
11 • • • ▪ ▪ ▪ ▪ ▪ 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…
12 • • • • • • • • •
• Deep-dive in async/await bei Backend-APIs
13 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
14 • • • • • • • • •
Deep-dive in async/await bei Backend-APIs
15 Deep-dive in async/await bei Backend-APIs ALU & FPU Registers
0 Registers 1 CPU Core with Hyper-Threading Classic CPU Core
16 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
17 Deep-dive in async/await bei Backend-APIs • • • Quelle:
“Systems Performance: Enterprise and the Cloud“, 2013, Brendan Gregg, Pearson Verlag
18 Deep-dive in async/await bei Backend-APIs • • • •
• •
19 Deep-dive in async/await bei Backend-APIs
20 • • • • • • .ContinueWith() • Deep-dive
in async/await bei Backend-APIs
21 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
22 • • • • • 🤯 Deep-dive in async/await
bei Backend-APIs
23 Deep-dive in async/await bei Backend-APIs
24 ▪ ▪ ▪ ▪ ▪ ▪ ⏳ ▪ ▪
▪ Deep-dive in async/await bei Backend-APIs ReadFile API: https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-readfile
25 ▪ ▪ ▪ ▪ ▪ ▪ ⏳ ▪ Deep-dive
in async/await bei Backend-APIs ReadFile API: https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-readfile
26 Deep-dive in async/await bei Backend-APIs • • IAsyncResult BeginSomething()
• EndSomething(result) • • DoSomethingAsync() • event SomethingCompleted • • Task[<T>] DoSomethingAsync()
27 Deep-dive in async/await bei Backend-APIs
28 • • async Task<> MyMethodAsync() • • • await
OtherMethodAsync() • • await • • • • Deep-dive in async/await bei Backend-APIs
29 Deep-dive in async/await bei Backend-APIs
30 Deep-dive in async/await bei Backend-APIs
31 • • task.GetAwaiter().GetResult() → ❌ • Thread.Sleep() → ❌
• await Task.Delay() → ✔ • Thread.SpinWait() • → ❌ • → ✔ Deep-dive in async/await bei Backend-APIs
32 • • var task1 = DoSomethingAsync(); var task2 =
DoSomethingElseAsync(); await Task.WhenAll(task1, task2); • • • Task.Factory.StartNew(…, TaskCreationOptions.LongRunning); • • • Deep-dive in async/await bei Backend-APIs
33 • • • • Deep-dive in async/await bei Backend-APIs
34 Deep-dive in async/await bei Backend-APIs
35 ▪ ▪ ▪ ▪ ▪ ▪ Deep-dive in async/await
bei Backend-APIs
36 ▪ ▪ ▪ ▪ ▪ 😉 Deep-dive in async/await
bei Backend-APIs
None