Webcamp Zagreb 2013

Slides for a talk "Concurrency" that I gave at Webcamp Zagreb.

Transcript

1. Concurrency
   @gperetin
   Sunday, October 27, 13
   

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2. Goran Peretin (@gperetin)
   Sunday, October 27, 13
   

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3. Goran Peretin (@gperetin)
   Sunday, October 27, 13
   

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4. Goran Peretin (@gperetin)
   Sunday, October 27, 13
   

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5. Goran Peretin (@gperetin)
   Sunday, October 27, 13
   

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6. Sadržaj
   Concurrency
   Parallelism
   Problemi/rješenja
   Sunday, October 27, 13
   

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7. Sunday, October 27, 13
   

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8. Demo time!
   Sunday, October 27, 13
   

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9. Python3 & Ruby
   Sunday, October 27, 13
   

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10. Concurrency
    Izvršavanje više taskova u nekom vremenskom
    periodu.
    Sunday, October 27, 13
    

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11. Parallelism
    Izvršavanje više taskova istovremeno.
    Sunday, October 27, 13
    

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12. Concurrency != Parallelism
    Sunday, October 27, 13
    

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13. Process-based concurrency
    task == proces
    Sunday, October 27, 13
    

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14. Thread-based concurrency
    task == thread
    Sunday, October 27, 13
    

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15. GIL (Ruby & Python)
    • Global Interpreter Lock
    • dva threada se ne mogu izvršavati
    istovremeno
    Sunday, October 27, 13
    

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16. Ruby i Python ne mogu imati thread-based
    parallelism.
    Sunday, October 27, 13
    

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17. PHP
    Sunday, October 27, 13
    

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18. PHP
    • PHP nema threadove
    • Nije thread-safe
    • PHP-FPM
    • Apache (mod_php)
    Sunday, October 27, 13
    

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19. Java & .NET
    Sunday, October 27, 13
    

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20. Java & .NET
    Sunday, October 27, 13
    

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21. Problemi?
    • broj procesa i threadova
    • RAM
    Sunday, October 27, 13
    

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22. Blocking I/O
    OS pauzira thread koji napravi I/O request.
    Za izvršavanje drugog requesta treba nam novi
    thread.
    Sunday, October 27, 13
    

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23. Rješenja?
    Non-blocking I/O
    Lightweight processes
    Sunday, October 27, 13
    

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24. Non-blocking I/O
    Twisted, Tornado
    EventMachine
    Node.js
    Sunday, October 27, 13
    

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25. Lightweight processes
    Erlang (actors)
    Go (goroutines)
    ---
    Python (greenlets)
    Ruby (fibers)
    Sunday, October 27, 13
    

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26. Što da koristim?
    Sunday, October 27, 13
    

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27. Hvala!
    Pitanja?
    Sunday, October 27, 13
    

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