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Parallelizing a Real-Time Steering Simulation for Computer Games with OpenMP by Bjoern Knafla and Claudia Leopold (now Fohry)

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    Parallelizing a Real-Time Steering Simulation for Computer Games with OpenMP by Bjoern Knafla and Claudia Leopold (now Fohry) - Presentation Transcript

    1. Parallelizing a Real-Time Steering Simulation for Computer Games with OpenMP Bjoern Knafla and Claudia Leopold University of Kassel (Germany) Dienstag, 11. September 2007 1
    2. Dienstag, 11. September 2007 2
    3. Steering a flock of birds Dienstag, 11. September 2007 2
    4. Dienstag, 11. September 2007 3
    5. Dienstag, 11. September 2007 3
    6. Dienstag, 11. September 2007 3
    7. Bird Dienstag, 11. September 2007 3
    8. Bird Boid Dienstag, 11. September 2007 3
    9. Bird Boid Agent Dienstag, 11. September 2007 3
    10. Dienstag, 11. September 2007 4
    11. CPU core Dienstag, 11. September 2007 4
    12. Dienstag, 11. September 2007 4
    13. CPU CPU CPU CPU core core core core CPU CPU CPU CPU core core core core CPU CPU CPU CPU core core core core CPU CPU CPU CPU core core core core Dienstag, 11. September 2007 4
    14. Dienstag, 11. September 2007 4
    15. Outline Dienstag, 11. September 2007 5
    16. Outline 1. Steering behaviors Dienstag, 11. September 2007 5
    17. Outline 1. Steering behaviors 2. OpenSteerDemo Dienstag, 11. September 2007 5
    18. Outline 1. Steering behaviors 2. OpenSteerDemo 3. Bad parallelization Dienstag, 11. September 2007 5
    19. Outline 1. Steering behaviors 2. OpenSteerDemo 3. Bad parallelization 4. Parallelization that works Dienstag, 11. September 2007 5
    20. Outline 1. Steering behaviors 2. OpenSteerDemo 3. Bad parallelization 4. Parallelization that works 5. Performance Dienstag, 11. September 2007 5
    21. Outline 1. Steering behaviors 2. OpenSteerDemo 3. Bad parallelization 4. Parallelization that works 5. Performance 6. Summary Dienstag, 11. September 2007 5
    22. Steering behaviors Dienstag, 11. September 2007 6
    23. Dienstag, 11. September 2007 7
    24. Dienstag, 11. September 2007 7
    25. Dienstag, 11. September 2007 7
    26. Dienstag, 11. September 2007 7
    27. Alignment Dienstag, 11. September 2007 8
    28. OpenSteerDemo Dienstag, 11. September 2007 9
    29. OpenSteerDemo Testbed for the open source library OpenSteer from Craig W. Reynods Dienstag, 11. September 2007 9
    30. OpenSteerDemo Testbed for the open source library OpenSteer from Craig W. Reynods Simulates steering behavior of agents Dienstag, 11. September 2007 9
    31. OpenSteerDemo Testbed for the open source library OpenSteer from Craig W. Reynods Simulates steering behavior of agents Game-like C++ real-time application Dienstag, 11. September 2007 9
    32. OpenSteerDemo Testbed for the open source library OpenSteer from Craig W. Reynods Simulates steering behavior of agents Game-like C++ real-time application OpenGL Dienstag, 11. September 2007 9
    33. OpenSteerDemo Testbed for the open source library OpenSteer from Craig W. Reynods Simulates steering behavior of agents Game-like C++ real-time application OpenGL http://opensteer.sourceforge.net Dienstag, 11. September 2007 9
    34. Main loop Dienstag, 11. September 2007 10
    35. Main loop Input Update Output Dienstag, 11. September 2007 10
    36. Main loop Graph- Input Update ics Dienstag, 11. September 2007 11
    37. Input stage Graph- Input Update ics Time step t Dienstag, 11. September 2007 12
    38. Update stage Graph- Input Update ics Time step t Dienstag, 11. September 2007 13
    39. Graphics stage Graph- Input Update ics Time step t Dienstag, 11. September 2007 14
    40. Next main loop cycle Graph- Input Update ics Time step t+1 Dienstag, 11. September 2007 15
    41. Update stage Graph- Input Update ics Dienstag, 11. September 2007 16
    42. Agent update Update agent read + write read + write read + write write Agent Neighbors Random. Graphics state references Dienstag, 11. September 2007 17
    43. Time step t In state t-1 Update Update Update Update agent agent agent ... agent 0 1 2 n Sequential agent update order Dienstag, 11. September 2007 18
    44. Time step t In state t-1 Update Update Update Update agent agent agent ... agent 0 1 2 n Sequential Neighbors agent update order In state t-1 Dienstag, 11. September 2007 18
    45. Time step t In state t-1 Update Update Update Update agent agent agent ... agent 0 1 2 n Sequential agent update order Dienstag, 11. September 2007 19
    46. Time step t In state t In state t-1 Update Update Update Update agent agent agent ... agent 0 1 2 n Sequential agent update order Dienstag, 11. September 2007 20
    47. Time step t In state t In state t-1 Update Update Update Update agent agent agent ... agent 0 1 2 n Sequential agent update order Dienstag, 11. September 2007 21
    48. Time step t In state t In state t-1 Update Update Update Update agent agent agent ... agent 0 1 2 n Sequential Neighbors agent update order In state ? Dienstag, 11. September 2007 21
    49. Bad parallelization Dienstag, 11. September 2007 22
    50. Dienstag, 11. September 2007 23
    51. Questionable reliability and correctness Dienstag, 11. September 2007 23
    52. No speedup Dienstag, 11. September 2007 24
    53. No speedup Dienstag, 11. September 2007 24
    54. Main parallelization problems Dienstag, 11. September 2007 25
    55. Dienstag, 11. September 2007 26
    56. Race conditions Dienstag, 11. September 2007 26
    57. Race conditions Global variables, deep inheritance hierarchies, strongly interdependent classes Dienstag, 11. September 2007 26
    58. Race conditions Global variables, deep inheritance hierarchies, strongly interdependent classes Non-determinism Dienstag, 11. September 2007 26
    59. Race conditions Global variables, deep inheritance hierarchies, strongly interdependent classes Non-determinism Order of agent updates and random numbers Dienstag, 11. September 2007 26
    60. Race conditions Global variables, deep inheritance hierarchies, strongly interdependent classes Non-determinism Order of agent updates and random numbers Non-thread-safe functions Dienstag, 11. September 2007 26
    61. Parallelization that works Dienstag, 11. September 2007 27
    62. Guiding ideas Dienstag, 11. September 2007 28
    63. Guiding ideas Update order independent simulation Dienstag, 11. September 2007 28
    64. Guiding ideas Update order independent simulation Agent modification only dependent on its steering vector Dienstag, 11. September 2007 28
    65. Guiding ideas Update order independent simulation Agent modification only dependent on its steering vector Minimize synchronization Dienstag, 11. September 2007 28
    66. Guiding ideas Update order independent simulation Agent modification only dependent on its steering vector Minimize synchronization Finish parallel processing before graphics stage Dienstag, 11. September 2007 28
    67. Guiding ideas Update order independent simulation Agent modification only dependent on its steering vector Minimize synchronization Finish parallel processing before graphics stage Interfaces for explicit context Dienstag, 11. September 2007 28
    68. Refactorization Dienstag, 11. September 2007 29
    69. Split agent update Agent update Sim. Modify agent agent Agent update order Dienstag, 11. September 2007 30
    70. Simulate agent stage read + write Sim. agent Steering Vector read read write Agent Render- Random. Neighbors state Feeder Agent Agent public state references Agent private Dienstag, 11. September 2007 31
    71. Simulate agent stage read + write Sim. agent Steering Vector read on st read on st write c c Agent Render- Random. Neighbors state Feeder Agent Agent public state references Agent private Dienstag, 11. September 2007 31
    72. Modify agent stage read Modify agent Steering Vector read + write Agent Render- Random. Neighbors state Feeder Agent Agent public state references Agent private Dienstag, 11. September 2007 32
    73. Modify neighbor data structure Modify neigh- bors Steering Vector read write Agent Render- Random. Neighbors state Feeder Agent Agent public state references Agent private Dienstag, 11. September 2007 33
    74. Refactor update stage Input Update Output Dienstag, 11. September 2007 34
    75. Split update stage Update stage Sim. Modify Sub-stages: simulation and modification Dienstag, 11. September 2007 35
    76. Old update stage Update agent Update agent Update agent Sim. Modify Sim. Modify Sim. Modify agent agent agent agent ... agent agent 0 0 1 1 n n Sequential processing order Dienstag, 11. September 2007 36
    77. Time step t Agents in state t-1 Sim. Modify Sim. Modify Sim. Modify agent agent agent agent ... agent agent 0 0 1 1 n n Sequential processing order Dienstag, 11. September 2007 37
    78. Time step t Agent in state t Agents in state t-1 Sim. Modify Sim. Modify Sim. Modify agent agent agent agent ... agent agent 0 0 1 1 n n Sequential processing order Dienstag, 11. September 2007 38
    79. New update stage Simulation sub-stage Modification sub-stage Sim. Sim. Sim. Modify Modify Modify agent agent ... agent agent agent ... agent 0 1 n 0 1 n Sequential processing order Dienstag, 11. September 2007 39
    80. Time step t Agents in public state t-1 Sim. Sim. Sim. Modify Modify Modify agent agent ... agent agent agent ... agent 0 1 n 0 1 n Sequential processing order Dienstag, 11. September 2007 40
    81. Time step t Agents in public state t-1 Sim. Sim. Sim. Modify Modify Modify agent agent ... agent agent agent ... agent 0 1 n 0 1 n Sequential processing order Dienstag, 11. September 2007 41
    82. Time step t Agents in public state t-1 Sim. Sim. Sim. Modify Modify Modify agent agent ... agent agent agent ... agent 0 1 n 0 1 n Sequential processing order Dienstag, 11. September 2007 42
    83. Time step t Agents in public state t-1 Sim. Sim. Sim. Modify Modify Modify agent agent ... agent agent agent ... agent 0 1 n 0 1 n Sequential Each agent is modified processing based solely on its own order state Dienstag, 11. September 2007 42
    84. Parallelization Dienstag, 11. September 2007 43
    85. Parallel update stage Simulation Modification S S M M M P P B B a S S a M M M a a r r r r Update a S S S a M M M r r neigh- l l i i bors l S S l M M M e e e e Possibly r r l S S S l M M M parallel Dienstag, 11. September 2007 44
    86. Parallel simulation sub-stage Simulation Modification S S P P B B a S S a a a r r r r Update a S S S a r r neigh- l l i i bors l S S l e e e e Possibly r r l S S S l parallel Dienstag, 11. September 2007 45
    87. Parallel modification sub-stage Simulation Modification M M M P P B B a a M M M a a r r r r Update a a M M M r r neigh- l l i i bors l l M M M e e e e Possibly r r l l M M M parallel Dienstag, 11. September 2007 46
    88. Parallel modification sub-stage Simulation Modification P P B B a a a a r r r r Update a a r r neigh- l l i i bors l l e e e e Possibly r r l l parallel Dienstag, 11. September 2007 47
    89. Performance Dienstag, 11. September 2007 48
    90. Test-computer Dual-processor dual- core 2 GHz AMD Opteron with 2 GB Ram 2x Nvidia 7800 GTX graphics cards in SLI mode Linux OS Dienstag, 11. September 2007 49
    91. Max speedups Dienstag, 11. September 2007 50
    92. Max speedups Comparison of OpenSteerDemo flock of birds simulation with 4 threads with OpenMP-disabled version Dienstag, 11. September 2007 50
    93. Max speedups Comparison of OpenSteerDemo flock of birds simulation with 4 threads with OpenMP-disabled version Whole application: ! 2.84 Dienstag, 11. September 2007 50
    94. Max speedups Comparison of OpenSteerDemo flock of birds simulation with 4 threads with OpenMP-disabled version Whole application: ! 2.84 Update stage: !! ! 3.54 Dienstag, 11. September 2007 50
    95. Summary Dienstag, 11. September 2007 51
    96. Dienstag, 11. September 2007 52
    97. Refactored first Dienstag, 11. September 2007 52
    98. Refactored first Simplicity! Dienstag, 11. September 2007 52
    99. Refactored first Simplicity! High-level design to min. synchronization Dienstag, 11. September 2007 52
    100. Refactored first Simplicity! High-level design to min. synchronization Explicit context Dienstag, 11. September 2007 52
    101. Refactored first Simplicity! High-level design to min. synchronization Explicit context Deferred computation Dienstag, 11. September 2007 52
    102. Refactored first Simplicity! High-level design to min. synchronization Explicit context Deferred computation Identified slices for data-parallel computation Dienstag, 11. September 2007 52
    103. Thank you! Dienstag, 11. September 2007 53
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