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oneAPI-aware MPI #914

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oneAPI-aware MPI #914

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4 changes: 4 additions & 0 deletions Project.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -34,15 +34,19 @@ Requires = "~0.5, 1.0"
Serialization = "1"
Sockets = "1"
julia = "1.6"
oneAPI = "2.1"

[extensions]
AMDGPUExt = "AMDGPU"
CUDAExt = "CUDA"
OneAPIExt = "oneAPI"

[extras]
AMDGPU = "21141c5a-9bdb-4563-92ae-f87d6854732e"
CUDA = "052768ef-5323-5732-b1bb-66c8b64840ba"
oneAPI = "8f75cd03-7ff8-4ecb-9b8f-daf728133b1b"

[weakdeps]
AMDGPU = "21141c5a-9bdb-4563-92ae-f87d6854732e"
CUDA = "052768ef-5323-5732-b1bb-66c8b64840ba"
oneAPI = "8f75cd03-7ff8-4ecb-9b8f-daf728133b1b"
27 changes: 27 additions & 0 deletions ext/OneAPIExt.jl
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@@ -0,0 +1,27 @@
module OneAPIExt

import MPI
isdefined(Base, :get_extension) ? (import oneAPI) : (import ..oneAPI)
import MPI: MPIPtr, Buffer, Datatype

function Base.cconvert(::Type{MPIPtr}, A::oneAPI.oneArray{T}) where T
A
end

function Base.unsafe_convert(::Type{MPIPtr}, X::oneAPI.oneArray{T}) where T
reinterpret(MPIPtr, Base.unsafe_convert(oneAPI.ZePtr{T}, X))
end

# only need to define this for strided arrays: all others can be handled by generic machinery
function Base.unsafe_convert(::Type{MPIPtr}, V::SubArray{T,N,P,I,true}) where {T,N,P<:oneAPI.oneArray,I}
X = parent(V)
pX = Base.unsafe_convert(oneAPI.ZePtr{T}, X)
pV = pX + ((V.offset1 + V.stride1) - first(LinearIndices(X)))*sizeof(T)
return reinterpret(MPIPtr, pV)
end

function Buffer(arr::oneAPI.oneArray)
Buffer(arr, Cint(length(arr)), Datatype(eltype(arr)))
end

end # OneAPIExt