Unity ECS perfomance is worst than in third-party ECS?

Or maybe im doing something wrong?

Samsung j1 mini.
10000 entities, single thread.

Unity ECS - 40fps
Unity-Ash ECS - 50fps

Both systems just increments int variable.

Unity ECS:

Code (CSharp):

1.     protected override void OnUpdate()
2.     {
3.         var i = 0;
4.  
5.         foreach (var e in GetEntities<TestNode>())
6.         {
7.             i++;
8.         }
9.     }

Ash:

Code (CSharp):

1. public void Update(float deltaTime)
2.     {
3.         int i = 0;
4.         foreach (TestNode node in _nodes)
5.         {
6.             i++;
7.         }
8.     }

Test source in attachments:

 

Well, time of adding/removing entities is more important than iteration time, so i will test it tomorrow.

 

I've heard in other threads that using Group injection is more performant than GetEntities<>().

Try something like this:

Code (CSharp):

1.  
2.  
3. struct TestNodeGroup
4. {
5.         public ComponentDataArray<TestNode> TestNodes;
6.         public int Length;
7. }
8.  
9. [Inject] TestNodeGroup _testNodeGroup;
10.  
11. protected override void OnUpdate()
12. {
13.         var i = 0;
14.         var len = _testNodeGroup.Length;
15.         for(; i < len; ++i)
16.         {
17.                 ++i;
18.         }
19. }
20.  
21.  

In addition, add/removing components frequently could cause issues as the entity will need to be migrated to a new archetype (set of related components that determine how/where the entity is allocated). There are ways of batching these changes for performance.

 

ComponentDataArray is only working with IComponentData, which is not usable with classic gameobjects, prefabs etc

 

fps isn't a very specific measurement, try using a profiler and check milliseconds used for certain operations to find out what is going on.

 

You can use IComponentData for classic GameObjects! Just use the ComponentDataWrapper and Serialization!

Code (CSharp):

1. [Serialization]
2. struct Health : IComponentData {
3.     public float Value;
4. }
5.  
6. public class HealthComponent : ComponentDataWrapper<Health> { }

Add HealthComponent to your GameObject.

You can also instantiate your Prefab and add all components by script. Your Perfab also requires a GameObjectEntity component.

IComponentData can than be computed with Jobs. Only legacy components like Animator, Rigidbody, Collider,... can't be computed in parallel.