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High-level Multithreaded Programming [Part I]

High-level Multithreaded Programming [Part I]. Primo ž Gabrijelčič. Background Information. About Me. Primo ž Gabrijelčič Programmer, consultant, writer, speaker thedelphigeek.com www.glagolite.si/delphi Working with Delphi since Delphi 1 Hacking multithreaded code since 1999.

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High-level Multithreaded Programming [Part I]

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  1. High-level Multithreaded Programming [Part I] Primož Gabrijelčič

  2. Background Information

  3. About Me • Primož Gabrijelčič • Programmer, consultant, writer, speaker • thedelphigeek.com • www.glagolite.si/delphi • Working with Delphi since Delphi 1 • Hacking multithreaded code since 1999

  4. About OmniThreadLibrary • „VCL for multithreading“ • Delphi 2007 – XE3[4] • Open source – OpenBSD license • www.omnithreadlibrary.com • omnithreadlibrary.googlecode.com • Win32/Win64

  5. About the Webinars • Code and video: www.omnithreadlibrary.com/webinars • Code = free, video = $10, bundles! • 20 free books, courtesy of the De Novo Software, www.denovosoftware.com

  6. Installation • Download the installation package from the Google Code or checkout the SVN repository • Add installation folder and its src subfolder to the project search path or Win32/64 library path • Add the OtlParallel unit to the uses list

  7. Documentation • Blog tutorials • “The book” • Presentations • Forum • Google+: OmniThreadLibrary • @TheDelphiGeek: #omnithreadlibrary www.omnithreadlibrary.com

  8. Why Multithreading? • Improve performance • Improve responsiveness

  9. High-Level Abstractions

  10. Why? • Designing parallel solutions is hard • Writing multithreaded code is hard • Testing multithreaded applications is hard • Debugging multithreaded code is pure …

  11. INSANITY!

  12. OTL to the Rescue! • Well-tested components … • packed in reusable classes … • with high-level parallel programming support.

  13. High-Level Abstractions • ParallelTask • BackgroundWorker • ForkJoin • Pipeline • Async [/Await] • Future • Join • ForEach

  14. Which abstraction to use? • Consider data flow!

  15. High-Level Abstractions • ParallelTask • BackgroundWorker • ForkJoin • Pipeline • Async [/Await] • Future • Join • ForEach Start background task and continue

  16. Async [/Await]

  17. High-Level Abstractions • ParallelTask • BackgroundWorker • ForkJoin • Pipeline • Async [/Await] • Future • Join • ForEach • Start background calculation and retrieve the result

  18. Future

  19. High-Level Abstractions • ParallelTask • BackgroundWorker • ForkJoin • Pipeline • Async [/Await] • Future • Join • ForEach • Start multiple background tasks [and wait]

  20. Join

  21. Parting Notes

  22. Keep in Mind • Don’t parallelize everything • Rethink the algorithm • Data flow dictates the abstraction • Measure the improvements • Test, test and test

  23. Code and Video www.omnithreadlibrary.com/webinars

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