Resolved How to reduce render batches like Official Sample Boids

Hi.
I have a demo to test DOTs code, it goes well.
But there are more render batches(more instance call in FrameDebuger) than official sample Boids's even Sample Boids has much more Tris and instance data .
I have no idea what happened and need help. Thanks.
Here is a picture:

 

For starters, why is your number of vertices more than double? This seems odd.
Despite this, your cpu and gpu time indicate your scene is actually more performant. You also have less SetPassCalls, which are the more taxing Draw Calls/Batches, so that is great!

The overhead of draw calls has been improved over time by Unity. It seems you also get a nice performance boost from DOTS as well.

I'd worry less about the batch numbers and more about specific performance bottlenecks, should you encounter them.

 

Thanks for your replay.

The mesh is Unity default Cube mesh, It has double vertices indeed
In DOTs Hybrid batch can reduce SetPass call. for more information :
https://forum.unity.com/threads/confused-about-performance-of-srp-batching-vs-gpu-instancing.949185/

There are 50000 fish instances and huge amount Tris and Verts in the Boids Sample runtime, low batch number for Hybrid Batch function i knonw, but it's not same effect in my demo, it confuses me. In the further it could be a problem when lots lots of Units appear in project.

DOTs is perfect. Later DOTs Animation，Physics code will be tested too .

 

I got the reason about the difference of batch number between two samples.
Official Sample Boids initialize all unit instances once a time:

Code (CSharp):

1. var world = World.Unmanaged;
2.                 var boidEntities = CollectionHelper.CreateNativeArray<Entity, RewindableAllocator>(boidSchool.Count, ref world.UpdateAllocator);
3.  
4.                 Profiler.BeginSample("Instantiate");
5.                 EntityManager.Instantiate(boidSchool.Prefab, boidEntities);
6.                 Profiler.EndSample();

My Sample initialize a unit instance per a given time:

Code (CSharp):

1. float time = spawn.ValueRO.Time + deltaTime;
2.             if(time < spawn.ValueRO.InterTime)
3.             {
4.                 spawn.ValueRW.Time = time;
5.                 continue;
6.             }
7.             state.EntityManager.Instantiate(spawn.ValueRO.Prefab);
8.  
9.             spawn.ValueRW.Time = time - spawn.ValueRO.InterTime;

Initialize entities frequently cause structure change propblem,
it seems no problem to the unit archetypes chunk number, Dose it make some trouble to Hybird Batch Strategy？

 

Thank you JussiKnuuttila, It's very clear now.
I will try the re-batch method to deepen my understanding.