The Data Oriented Tech Stack (DOTS) is an architecture (ECS), a C# Job System and a compiler (Burst) on top of which we are building the future of the Unity engine. DOTS is designed with cache constraints, multi core processing and vector units in mind. This talk is a detailed overview of the internal implementation of DOTS.

1. GenerativeArt—MadewithUnity
DOTS
Unity meets Data Oriented Design
Fabrice Lété
Software Engineer, Unity
fabricel@unity3d.com

2. ● Problem & Constraints
● Data Oriented Design
● ECS
● DOTS & Unity
2
DOTS
Unity meets Data Oriented Design
Unity meets Data Oriented Design

3. 3
The problem
-
Scalability

4. 4

5. 5
Same Hardware
More Stuff
Same Stuff
Less Hardware

6. 6
Constraint #1
-
The hardware

7. 7
CPU
Memory
Performance
Based on data from: Hennessy, Patterson: Computer Architecture: A Quantitative Approach, 5th Edition.

8. 8
CPU
Memory
Gap grows
50% a year
Performance

9. 9
CPU
Memory
Performance

10. 10
Constraint #2
-
Existing Workflows

11. 11

12. 12
Data Oriented Design
-
Core principles

13. 13
Understand Hardware
● Memory Bottleneck
● Expensive Branching
● Parallelism
● Asynchronicity

14. 14
Airplane
Baggage Truck

15. 15
Airplane ● Keep running

16. 16
Airplane ● Keep running → prefetch
Baggage Truck

17. 17
Airplane
Baggage Truck
● Full capacity

18. 18
Airplane
Baggage Truck
● Full capacity → pack

19. 19
Airplane
Baggage Truck
● Homogenous

20. 20
Airplane
Baggage Truck
● Homogenous → group

21. 21
Ideal Data Layout
Linear GroupedPacked

22. 22
Embrace Data
● Resist abstraction
● Design for transformation
● Mesure early, often, holistically
Data Transform Data

23. 23
Data Oriented Design
-
Standard Industry Practice

24. 24
Entity Component System
-
Core Principles

25. 25
Health
Position
Target
Health
Position
Target
Health
Position
Target
Linear
Health Health Health Health
Position Position Position Position
Target Target Target Target
Linear
Linear

26. 26
Position
Target
Position
Target
Position
Target
Position Position Position Position
Target Target Target Target
Component
Component
Component
Health Health Health Health Health Health Health

27. 27
Position
Target
Position
Target
Position
Target
Position Position Position Position
Target Target Target Target
Entity
Health Health Health Health Health Health Health

28. 28
Position
Target
Position
Target
Position
Target
Position Position Position Position
Target Target Target Target
Entity
Health Health Health Health Health Health Health

29. 29
Position
Target
Position
Target
Position
Target
Position Position Position Position
Target Target Target Target
Entity
Health Health Health Health Health Health Health

30. 30
Position
Target
Position Position
Target
Position Position Position Position
Target Target
Health Health Health Health Health Health Health

31. 31
Health
Position
Target
Health
Position
Health
Position
Target
Health Health Health Health
Position Position Position Position
Target Target

32. 32
Health
Position
Target
Health
Position
Health
Position
Target
Health Health Health Health
Position Position Position Position
Target Target
Archetype Archetype

33. 33

34. 34

35. 35
Chunk Chunk Chunk Chunk

36. Archetype ###
36
Chunk Chunk Chunk Chunk

37. 37
A B C
D E
Archetypes
A B
B C
B D E
C E

38. 38
A B C
D E
Archetypes
A B
B C
B D E
C E
Query
B

39. 39
A B C
D E
Archetypes
A B
B C
B D E
C E
Query
B C

40. 40
A B C
D E
Archetypes
A B
B C
B D E
C E
Query
C D

41. 41
Data Transform Data

42. 42
Archetype
Archetype
Archetype
Archetype
Archetype
Archetype
Archetype
Archetype
Data Transform Data

43. 43
System System System
Archetype
Archetype
Archetype
Archetype
Archetype
Archetype
Archetype
Archetype

44. 44
System
Query
Query
System
Query
System
Query
Query
Archetype
Archetype
Archetype
Archetype
Archetype
Archetype
Archetype
Archetype

45. 45
System
Query
Query
System
Query
System
Query
Query
Archetype
Archetype
Archetype
Archetype
Archetype
Archetype
Archetype
Archetype

46. 46
0 1 2 3 4 5 6 7 8 9 10 11 Core
Core
Core
Time
12 13

47. 47
0 1 2 3 4
5 6 7 8 9
10 11
Core
Core
Core
Time
12 13

48. 48
Core
Core
Core
Time
0 1 2 3 4
5 6 7 8 9
10 11 12 13

49. 49
Core
Core
Core
Time
0 1
2 3 4
5 6 7 8 9
10 11 12 13

50. 50
Core
Core
Core
Time
0 1
2 3
45 6 7 8 9
10 11 12 13

51. 51
Data Oriented Tech Stack
Entity
Component
System
Burst CompilerC# Job System

52. 52
Scalability
Runtime Data
Authoring Data
Streaming
Goal #1

53. 53
Open & Flexible
Open Source C# Packages
Goal #2

54. 54
Iteration Speed
Less Boilerplate LiveLink
Goal #3

55. 55
https://unity.com/megacity

56. GenerativeArt—MadewithUnity
Thank you!
More info
https://unity.com/dots
Fan mail
fabricel@unity3d.com