# WorldUpdateAllocator

> Retrieve the world update allocator of the World in which this system exists.

## Definition

* **Type:** Property
* **Namespace:** [Unity.Entities](/engine/7000.0/script-reference/unity/entities.md)
* **Assembly:** UnityEngine.EntitiesModule

```csharp
public Allocator WorldUpdateAllocator { get; }
```

### Remarks

Behind the world update allocator are double rewindable allocators, and the two allocators are switched in each world update.  Therefore user cannot cache the world update allocator.