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Add LevelPlaceholderSpace #1987

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Sep 13, 2024
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Add LevelPlaceholderSpace #1987

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5 changes: 5 additions & 0 deletions NEWS.md
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,11 @@ ClimaCore.jl Release Notes
main
-------

v0.14.15
-------

- Added support for mixing extruded and horizontal spaces in GPU kernels. PR [#1987](https://github.com/CliMA/ClimaCore.jl/pull/1987).

v0.14.14
-------

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2 changes: 1 addition & 1 deletion Project.toml
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@@ -1,7 +1,7 @@
name = "ClimaCore"
uuid = "d414da3d-4745-48bb-8d80-42e94e092884"
authors = ["CliMA Contributors <clima-software@caltech.edu>"]
version = "0.14.14"
version = "0.14.15"

[deps]
Adapt = "79e6a3ab-5dfb-504d-930d-738a2a938a0e"
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19 changes: 14 additions & 5 deletions src/Operators/common.jl
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Expand Up @@ -69,13 +69,21 @@ end

# Functions for CUDASpectralStyle
struct PlaceholderSpace <: Spaces.AbstractSpace end
struct LevelPlaceholderSpace <: Spaces.AbstractSpace end
struct CenterPlaceholderSpace <: Spaces.AbstractSpace end
struct FacePlaceholderSpace <: Spaces.AbstractSpace end


placeholder_space(current_space, parent_space) = current_space
placeholder_space(current_space::T, parent_space::T) where {T} =
PlaceholderSpace()
placeholder_space(current_space, parent_space) = current_space
placeholder_space(
current_space::Spaces.AbstractPointSpace,
parent_space::Spaces.AbstractFiniteDifferenceSpace,
) = LevelPlaceholderSpace()
placeholder_space(
current_space::Spaces.AbstractSpectralElementSpace,
parent_space::Spaces.ExtrudedFiniteDifferenceSpace,
) = LevelPlaceholderSpace()
Comment on lines +79 to +86
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Why should these return level spaces?

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Suppose that, as in the case of the nonorographic gravity wave parametrization, we have a broadcast over extruded/vertical fields and horizontal/point fields that needs to be evaluated on the GPU. The parent_space in this case is the space of the extruded/vertical output field, and the current_space is either the same as the parent_space or just one level of the parent_space. In the first case we get a PlaceholderSpace, and in the second case we get a LevelPlaceholderSpace.

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That may makes sense for the second method, but the first method looks to me like it should return the parent space.

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That’s after all how we support point-sphere broadcasting.

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If the first method returned parent_space instead of LevelPlaceholderSpace, there would be multiple non-placeholder spaces passed to the GPU. My impression is that we want only one non-placeholder space (the output of the broadcast) passed to the GPU, and all other spaces can be reconstructed from that non-placeholder space when they are needed.

With the current design, if a PointField is used in a broadcast expression with a FiniteDifferenceField as the output, a LevelPlaceholderSpace will be returned by placeholder_space and a PointSpace will be returned by reconstruct_placeholder_space. If the first method returned parent_space instead of LevelPlaceholderSpace, reconstruct_placeholder_space would return a FiniteDifferenceSpace for a PointField, which makes no sense to me.

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Yeah, sorry, I meant ..., but the first method looks to me like it should a type similar to the parent space..

if a PointField is used in a broadcast expression with a FiniteDifferenceField as the output

Given this condition, I agree with you, but this condition is not enforced in placeholder_space, which is why this change looks a bit odd to me.

placeholder_space(
current_space::Spaces.CenterFiniteDifferenceSpace,
parent_space::Spaces.FaceFiniteDifferenceSpace,
Expand All @@ -93,8 +101,12 @@ placeholder_space(
parent_space::Spaces.CenterExtrudedFiniteDifferenceSpace,
) = FacePlaceholderSpace()

@inline reconstruct_placeholder_space(current_space, parent_space) =
current_space
@inline reconstruct_placeholder_space(::PlaceholderSpace, parent_space) =
parent_space
@inline reconstruct_placeholder_space(::LevelPlaceholderSpace, parent_space) =
Spaces.level(parent_space, left_idx(parent_space)) # extract arbitrary level
@inline reconstruct_placeholder_space(
::CenterPlaceholderSpace,
parent_space::Spaces.FaceFiniteDifferenceSpace,
Expand All @@ -111,9 +123,6 @@ placeholder_space(
::FacePlaceholderSpace,
parent_space::Spaces.CenterExtrudedFiniteDifferenceSpace,
) = Spaces.FaceExtrudedFiniteDifferenceSpace(parent_space)
@inline reconstruct_placeholder_space(current_space, parent_space) =
current_space


strip_space(obj, parent_space) = obj

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