Allocating temporary native containers in a Burst compiled job?

Trying to allocate a temporary (

Allocator.Temp

)

NativeArray

in a job is preventing Burst compilation from happening. Based on the error log from the Burst Inspector, some code in the

DisposeSentinel

is the culprit.

Will we be able to do such allocations at some point to some extent (even if it's only NativeArrays), or do we always have to allocate all containers outside of a Burst job?

 

It looks like if I'd be able to undefine

ENABLE_UNITY_COLLECTIONS_CHECKS

in the editor somehow temporarily, I would be able to get rid of the

DisposeSentinel

blocking Burst from compiling the jobs with NativeArray allocations in them. I've tried setting Jobs -> Leak Detection (Native Containers) off, but it always seems to sneak itself back on.

 

@timjohansson Any news about that ?

 

I agree that this is something of interest

 

Will Allocator.TempJob inside a Burst-compiled Job also be supported in 19.1? If so, how significant is the performance penalty compared to Allocator.Temp?

 

Only Allocator.Temp is supported

 

How does it work? Can we allocate native containers now inside a job struct?

 

Still fails on Dispose() of created array with Allocator.Temp inside the job (Unity 2019.1)

Code (CSharp):

1. C:\buildslave\unity\build\Runtime\Export\NativeArray\DisposeSentinel.cs(139,13): error: The IL opcode instruction `IL_0002: ldind.ref args(IL_0001)` is not supported by burst
2. at Unity.Collections.LowLevel.Unsafe.DisposeSentinel.Clear(ref Unity.Collections.LowLevel.Unsafe.DisposeSentinel sentinel) (at C:\buildslave\unity\build\Runtime\Export\NativeArray\DisposeSentinel.cs:139)
3. at Unity.Collections.LowLevel.Unsafe.DisposeSentinel.Dispose(ref Unity.Collections.LowLevel.Unsafe.AtomicSafetyHandle safety, ref Unity.Collections.LowLevel.Unsafe.DisposeSentinel sentinel) (at C:\buildslave\unity\build\Runtime\Export\NativeArray\DisposeSentinel.cs:75)
4. at Unity.Collections.NativeArray`1<Jobs.QuadAddData>.Dispose(Unity.Collections.NativeArray`1<Jobs.QuadAddData>* this) (at C:\buildslave\unity\build\Runtime\Export\NativeArray\NativeArray.cs:160)
5. at Jobs.SortQuadsJob.Sort(Jobs.SortQuadsJob* this, Unity.Collections.NativeList`1<Jobs.QuadAddData>* list, Jobs.ReverseComparerQuad comparer) (at G:\Unity\rocket_science\Assets\Scripts\Jobs\Planet\SortQuadsJob.cs:52)
6. at Jobs.SortQuadsJob.Execute(Jobs.SortQuadsJob* this) (at G:\Unity\rocket_science\Assets\Scripts\Jobs\Planet\SortQuadsJob.cs:21)
7. at Unity.Jobs.IJobExtensions.JobStruct`1<Jobs.SortQuadsJob>.Execute(ref Jobs.SortQuadsJob data, System.IntPtr additionalPtr, System.IntPtr bufferRangePatchData, ref Unity.Jobs.LowLevel.Unsafe.JobRanges ranges, int jobIndex) (at C:\buildslave\unity\build\Runtime\Jobs\Managed\IJob.cs:30)

Or am I missing something?

 

You don't need to call Dispose() on temp allocs it will dispose implicitly when out of scope.

 

was this fix ported back to 2018 LTS? or its it only in 19.x ?