Why is my job not running on worker thread?

Hi guys,
I am new to DOTS and that kind of programming. I am scheduling a CollisionJob and simple IJob with a .Schedule() command in OnUpdate function implemented by JobComponentSystem, but it seems the system is running on main thread from profiler(blue bar) with a cost of less or high 8ms. Also, I can't see the Job running like blue bar on main thread or worker thread, but they perform action.
Currently I can't share screen shot as I was working on office system will share that ASAP.
Any idea why?

Edit:
Profiler Stats

You can see the Default World Collision System in the main thread.

The Collision Job Code:

Code (CSharp):

1. [BurstCompile]
2.     struct CollisionFall : ICollisionEventsJobBase
3.     {
4.         public ComponentDataFromEntity<BucketComponent> bucket;
5.         public ComponentDataFromEntity<BlastComponent> component;
6.         public ComponentDataFromEntity<PhysicsGravityFactor> gravity;
7.         public ComponentDataFromEntity<PhysicsMassOverride> physicMass;
8.         public BufferFromEntity<BufferComponent> buffer;
9.         public void Execute(CollisionEvent collisionEvent)
10.         {
11.             Entity entityA = collisionEvent.EntityA;
12.             Entity entityB = collisionEvent.EntityB;
13.             if (component.HasComponent(entityA) && bucket.HasComponent(entityB))
14.             {
15.                 if (!component[entityA].isBlasted)
16.                 {
17.                     physicMass[entityA] = new PhysicsMassOverride
18.                     {
19.                         IsKinematic = 0
20.                     };
21.                     gravity[entityA] = new PhysicsGravityFactor
22.                     {
23.                         Value = 1
24.                     };
25.                     BlastComponent blastComponent = component[entityA];
26.                     blastComponent.isBlasted = true;
27.                     component[entityA] = blastComponent;
28.                 }
29.             }
30.             if (component.HasComponent(entityB) && bucket.HasComponent(entityA))
31.             {
32.                 if (!component[entityB].isBlasted)
33.                 {
34.                     physicMass[entityB] = new PhysicsMassOverride
35.                     {
36.                         IsKinematic = 0
37.                     };
38.                     gravity[entityB] = new PhysicsGravityFactor
39.                     {
40.                         Value = 1
41.                     };
42.                     component[entityA] = new BlastComponent
43.                     {
44.                         isBlasted = true
45.                     };
46.                 }
47.             }
48.         }
49.     }

The Main System

Code (CSharp):

1.  protected override JobHandle OnUpdate(JobHandle inputDeps)
2.     {
3.         var job = new CollisionFall();
4.         job.component = GetComponentDataFromEntity<BlastComponent>(false);
5.         job.bucket = GetComponentDataFromEntity<BucketComponent>(false);
6.         job.gravity = GetComponentDataFromEntity<PhysicsGravityFactor>(false);
7.         job.physicMass = GetComponentDataFromEntity<PhysicsMassOverride>(false);
8.        JobHandle jobHandle = job.Schedule(m_stepPhysicsWorld.Simulation, ref m_BuildPhysicsWorld.PhysicsWorld, inputDeps);
9.        return jobHandle;
10. }

 

Are you sure the job is not running on a worker thread? You can try logging the current thread ID (you'll need to temporarily disable Burst):

Code (CSharp):

1. int threadId = System.Threading.Thread.CurrentThread.ManagedThreadId;
2. UnityEngine.Debug.Log(threadId == 1 ? "Main thread" : $"Worker thread {threadId}");

If you're getting "Main thread" only, maybe make sure that you have job threads enabled:

 

I will check and let you know.