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Multithreading Made Simple with OmniThreadLibrary

Multithreading Made Simple with OmniThreadLibrary. Primož Gabrijelčič. Introduction. OmniThreadLibrary is …. … VCL for multithreading Simplifies programming tasks Componentizes solutions Allows access to the bare metal … trying to make multithreading possible for mere mortals

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Multithreading Made Simple with OmniThreadLibrary

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  1. Multithreading Made Simple with OmniThreadLibrary Primož Gabrijelčič

  2. Introduction

  3. OmniThreadLibrary is … • … VCL for multithreading • Simplifies programming tasks • Componentizes solutions • Allows access to the bare metal • … trying to make multithreading possible for mere mortals • … providing well-tested components packed in reusable classes with high-level parallel programming support • … parallel programming today!

  4. Project status • OpenBSD license • Actively developed • 1008 commits • Actively used • 2.0: 2710 downloads [in 7 months] • 2.1: 1187 downloads [in 3 months] • 2.2: current release, XE2 support • Delphi 2007 and above; currently Win32 only

  5. Installation • Download last installation from the Google Code or checkout the SVN repository • code.google.com/p/omnithreadlibrary/ • Add installation folder and its src subfolder to the project search path or Win32 library path • Add the OtlParallel unit to the uses list • That’s all folks!

  6. Future • Win64 • FMX • OS/X • iOS?

  7. OmniThreadLibrary basics

  8. Task vs. thread

  9. Communication

  10. High-level multithreading

  11. Be afraid “New programmers are drawn to multithreading like moths to flame, with similar results.” -Danny Thorpe

  12. Why high-level approach? • Designing parallel solutions is hard • Writing multithreaded code is hard • Testing multicore applications is hard • Debugging multithreadingcode is pure insanity • Debugging multithreading code is hard

  13. High-level multithreading • Async • start background task and continue • Future • start background calculation and retrieve the result • Join • start multiple background tasks and wait • ParallelTask • start multiple copies of one task and wait

  14. High-level multithreading • ForEach • parallel iteration over many different containers • Pipeline • run a multistage process • Fork/Join • divide and conquer, in parallel • Delphi 2009 required

  15. Async • Parallel.Async(code)

  16. Future • Future:=Parallel.Future<type>. (calculation); • Query Future.Value;

  17. Join • Parallel.Join([task1, task2, task3, … taskN]).Execute

  18. ParallelTask • Parallel.ParallelTask.Execute (code)

  19. ParallelFor • Parallel.ForEach(from, to).Execute(procedure (const value: integer);begin//…end) • Parallel.ForEach(source).Execute(procedure (const value: TOmniValue);begin//…end)

  20. ParallelFor

  21. Pipeline example

  22. Pipeline • Parallel.Pipeline([stage1, stage2, stage3]). Run

  23. Fork/Join • Divide and conquer

  24. Multithreading is hard?

  25. Why high-level approach? • Designing parallel solutions is hard • Writing multithreaded code is hard • Testing multicore applications is hard • Debugging multithreadingcode is pure insanity • Debugging multithreading code is hard

  26. Questions?

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