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timj-unity/system_update_order.md

Created March 21, 2018 00:19
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Documentation for system update order
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system_update_order.md

System update order

In ECS all systems are updated on the main thread. The order in which the are updated is based on a set of constraints and an optimization pass which tries to order the system in a way so that the time between scheduling a job and waiting for it is as long as possible. The attributes to specify update order of systems are [UpdateBefore(typeof(OtherSystem))] and [UpdateAfter(typeof(OtherSystem))]. In addition to update before or after other ECS systems it is possible to update before or after different phases of the Unity PlayerLoop by using typeof(UnityEngine.Experimental.PlayerLoop.FixedUpdate) or one of the other phases in the same namespace.

The UpdateInGroup attribute will put the system in a group and the same UpdateBefore and UpdateAfter attributes can be specified on a group or with a group as the target of the before/after dependency.

To use UpdateInGroup you need to create and empty class and pass the type of that to the UpdateInGroup attribute

public class UpdateGroup
{}

[UpdateInGroup(typeof(UpdateGroup))]
class MySystem : ComponentSystem
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