Question How to Use UnityEngine.Pool with NativeList

Hi there,

Has anyone used NativeLists with UnityEngine.Pool?
https://docs.unity3d.com/2021.1/Documentation/ScriptReference/Pool.UnsafeGenericPool_1.html

If so, any code examples.

Thanks

 

You don't need to pool NativeLists. There is no garbage involved in NativeList instantiation (when not having safety checks active).

 

Afaik the generic parameter of all the new Pools is constrained to

class

,
all native collections are structs, so no, its impossible.

Also, @julian-moschuering NativeLists do allocate of course since they own the memory, which means that it is always allocated on NativeList creation and freed on its disposal. Even if it's internal unity allocator, it's not free, so pooling may be as effective as with objects. The NativeList "handle" (object itself) is a struct, created and copied basically for free.

 

Thanks for your answer
Currently, I'm using a custom created pool but with Unity's own Pools in 2021, I thought of using them if there is possibility

 

In editor a persistent allocation is around 5x faster than a managed allocation, Temp around 30x faster and pooles are normally used in places where Temp/TempJob are usable. Additionally managed allocations have a much higher overhead due to them being handled by the GC.
With safety checks enabled each native container has at least one managed allocation making them slow but that doesn't effect standalone performance.

So as long as you don't use persistent for temporary allocations I don't think pooling is required.