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Concurrency in the imperative and functional world

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November 17, 2015
Programming
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Concurrency in the imperative and functional world

Presentation created for ITerior 2015 conference check http://iterior.com.br
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Scalone

November 17, 2015
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Transcript

  1. @Scalone Concurrency in the imperative and functional world

  2. Thiago Scalone [email protected] @scalone

  3. None
  4. None
  5. None

  6. … nothing new … DISCLAIMER

  7. If you don't understand concurrency… it isn’t problem if doesn't

    make part of your day. DISCLAIMER

  8. POINT

  9. Context 1

  10. None

  11. … and the light …

  12. None
  13. None
  14. None
  15. None
  16. None
  17. None

  18. Context 2

  19. None

  20. Concurrency

  21. Concurrency Parallelism

  22. “Dealing a lot of things at once Rob Pike about

    Concurrency

  23. “Doing a lot of things at once Rob Pike about

    Parallelism

  24. @Scalone

  25. @Scalone

  26. @Scalone

  27. @Scalone

  28. @Scalone

  29. @Scalone

  30. @Scalone

  31. @Scalone

  32. Context 3

  33. Imperative

  34. Imperative

  35. Imperative defines computation as statements that change a program state

  36. Imperative

  37. Imperative

  38. Functional

  39. Functional treats computation as the evaluation of mathematical functions and

    avoids state and mutable data

  40. Functional treats computation as the evaluation of mathematical functions and

    avoids state and mutable data

  41. Functional treats computation as the evaluation of mathematical functions and

    avoids state and mutable data

  42. Functional

  43. Functional

  44. Functional

  45. Functional

  46. Functional

  47. Functional

  48. None

  49. Concurrency

  50. Threads

  51. Thread and Locks

  52. Thread and Locks

  53. Thread and Locks

  54. Thread and Locks

  55. Thread and Locks

  56. Thread and Locks

  57. Thread and Locks

  58. Thread and Locks

  59. Java = Imperative

  60. Thread and Locks I don't know the answer

  61. Thread and Locks Mutable State

  62. Thread and Locks Race condition

  63. Race Condition the output is dependent on the sequence or

    timing of other uncontrollable events

  64. Thread and Locks The meaning of life is: 0

  65. None

  66. Thread and Locks The meaning of life is: 0

  67. Thread and Locks

  68. Thread and Locks

  69. Thread and Locks

  70. Thread and Locks

  71. Thread and Locks

  72. Thread and Locks

  73. Thread and Locks

  74. Thread and Locks

  75. Thread and Locks Optimization

  76. Optimization the compiler is allowed to statically optimize your code

    by reordering things

  77. Optimization the compiler is allowed to statically optimize your code

    by reordering things

  78. Optimization the JVM is allowed to dynamically optimize your code

    by reordering things

  79. Optimization the JVM is allowed to dynamically optimize your code

    by reordering things

  80. Optimization the hardware you’re running on is allowed to optimize

    performance by reordering things

  81. Optimization the hardware you’re running on is allowed to optimize

    performance by reordering things

  82. Imperative

  83. Imperative Thread Pool Mutual Exclusion Mutiple Locks - Deadlock Excessive

    Contention

  84. Functional

  85. Functional treats computation as the evaluation of mathematical functions and

    avoids state and mutable data

  86. Functional treats computation as the evaluation of mathematical functions and

    avoids state and mutable data

  87. Functional treats computation as the evaluation of mathematical functions and

    avoids state and mutable data

  88. Functional - Bound/Unbound Variable

  89. Functional - Bound/Unbound Variable

  90. Functional - Bound/Unbound Variable

  91. Functional - Bound/Unbound Variable

  92. Functional - Bound/Unbound Variable

  93. Determinism

  94. Determinism - Same In => Same out f(x)

  95. Determinism - Same In => Same out no disk I/O

    f(x)

  96. Determinism - Same In => Same out no disk I/O

    no random() f(x)

  97. Determinism - Same In => Same out no disk I/O

    no side effects no random() always the same result f(x)

  98. Determinism - Same In => Same out no disk I/O

    no side effects no random() f(x)

  99. Determinism

  100. Determinism

  101. Determinism 42

  102. Determinism

  103. Determinism + Concurrency

  104. Determinism + Concurrency

  105. Determinism + Concurrency

  106. Determinism + Concurrency

  107. Determinism + Concurrency

  108. Concurrency Models

  109. Actor

  110. Actor

  111. Actor An object which encapsulates state and communicates with other

    actors by exchaging messages

  112. Actor accumulator

  113. Actor accumulator

  114. Goroutines and Channels

  115. Goroutines and Channels

  116. Microthreads with a internal scheduler Goroutines and Channels

  117. Goroutines and Channels

  118. Goroutines and Channels

  119. Goroutines and Channels

  120. Goroutines and Channels

  121. Goroutines and Channels

  122. Goroutines and Channels

  123. Goroutines and Channels

  124. Goroutines and Channels

  125. References

  126. References

  127. References

  128. THANK YOU! @Scalone