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Why async matters
- 1. Why async matters Timur Babyuk timur.babyuk at gmail.com
- 4. Intro What is async? Asynchrony VS Synchrony
- 5. Intro Sync
- 6. Intro Sync
- 7. Intro Sync
- 8. Intro Async
- 9. Intro Async
- 10. Intro Async
- 11. Intro Async
- 12. Real world How does this work on my computer?
- 13. Usual case: obtain data from DB client = clientRepository.GetClient(id);
- 21. Sync Timeline MythreadTheirthread(s) Startof GetClient SQLQuery GotData Endof GetClient Waste :(
- 22. Resources Thread is a very important and heavyweight resource: - Keeps memory (from 1 MB) - Consumes CPU time - .NET Garbage Collector travers all threads’ roots - …
- 23. Resources Too many threads leads to slowdown
- 24. Resources Too many threads leads to slowdown …even if threads do nothing
- 26. I/O Completion Ports - Work on OS level
- 27. I/O Completion Ports - Work on OS level - Appeared in Windows NT 3.5
- 28. I/O Completion Ports - Work on OS level - Appeared in Windows NT 3.5 - Link with I/O op: network socket, file
- 29. I/O Completion Ports - Work on OS level - Appeared in Windows NT 3.5 - Link with I/O op: network socket, file - Once I/O completed, notification is sent to the port
- 38. Async Timeline MythreadTheirthread(s) Startof GetClient SQLQuery GotData Endof GetClient No Waste :)
- 39. Real life?
- 40. Real life? API matters! - File I/O - DB queries - Network - …
- 42. API Two approaches - BeginX / EndX
- 43. API Two approaches - BeginX / EndX (BeginRead/EndRead) - IAsyncResult interface - AsyncCallback
- 44. API Two approaches - BeginX / EndX (BeginRead/EndRead) - IAsyncResult interface - AsyncCallback - XAsync
- 45. API Two approaches - BeginX / EndX (BeginRead/EndRead) - IAsyncResult interface - AsyncCallback - XAsync (ReadAsync) - Task/Task<T> - CancellationToken
- 46. API BeginX/EndX code is often too complex to maintain asyncResult = fStream.BeginRead( tempState.ReadArray, 0 , tempState.ReadArray.Length, new AsyncCallback(EndReadCallback), tempState); void EndReadCallback(IAsyncResult result){ ... }
- 47. API XAsync is much easier using C# 5 async void ReadFile(FileStream file){ result=new byte[fileLength]; await file.ReadAsync(result, 0, result.Length); }
- 48. API XAsync is much easier using C# 5 async void ReadFile(FileStream file){ result=new byte[fileLength]; await file.ReadAsync(result, 0, result.Length); } Note: Mind the overhead!
- 49. API Available .NET API: - FileI/O – yes - Network I/O – yes - ADO.NET: SqlClient - yes - EF6 in RC with Async support – yes - EF5 – no
- 50. API Available 3dparty API (just a few): - Redis client BookSleeve – Yes - Solr.Net – No - NHibernate – No - …
- 51. Platforms Available platforms: - MVC – Yes - WebForms – Yes - WCF – Yes - …
- 52. Platforms Available platforms: - MVC – Yes - WebForms – Yes - WCF – Yes - … - NodeJS – yes!
- 53. Practice 1. Simple ASP.NET MVC application https://github.com/timba/async-web 2. Self-hosted WCF services application, uses a bit of outdated stuff https://github.com/timba/async-ef-performance-test
- 54. Thank you!