Jobs in ECS

ECS uses the C# Job System extensively. Whenever possible, you should use the jobs in your system code. The SystemBase class provides Entities.ForEach and Job.WithCode to help implement your game logic as multithreaded code. In more complex situations, you can use IJobChunk.

For example, the following system updates positions:

using Unity.Burst;
using Unity.Collections;
using Unity.Entities;
using Unity.Jobs;
using Unity.Transforms;

public class MovementSpeedSystem : SystemBase
{
    // OnUpdate runs on the main thread.
    protected override void OnUpdate()
    {
        Entities
            .ForEach((ref Translation position, in MovementSpeed speed) =>
                {
                    float3 displacement = speed.Value * dt;
                    position = new Translation(){
                            Value = position.Value + displacement
                        };
                })
            .ScheduleParallel();
    }
}

For more information about systems, see ECS Systems.