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Laplacian inversion on GPU via CUDA backend #3479

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Laplacian inversion on GPU via CUDA backend #3479

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0a1034e
WIP: added Laplacian inversion with CUDA backend
jonycastagna Aug 26, 2026
71d84ef
WIP: fixed allocation consistently with UMPIRE
jonycastagna Aug 26, 2026
83e9cae
Pass CI and complete the first CUDA-backed Laplacian inversion implem…
jonycastagna Aug 27, 2026
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1 change: 1 addition & 0 deletions cmake/SetupBOUTThirdParty.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,7 @@ if(BOUT_HAS_CUDA)
# compile features, set for the bout++ target.
set_source_files_properties(${BOUT_SOURCES_CXX} PROPERTIES LANGUAGE CUDA)
find_package(CUDAToolkit)
target_link_libraries(bout++ PUBLIC CUDA::cufft CUDA::cusparse)
set_target_properties(bout++ PROPERTIES CUDA_SEPARABLE_COMPILATION ON)
set_target_properties(bout++ PROPERTIES POSITION_INDEPENDENT_CODE ON)
set_target_properties(bout++ PROPERTIES LINKER_LANGUAGE CUDA)
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6 changes: 6 additions & 0 deletions examples/hasegawa-wakatani/CMakeLists.txt
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Expand Up @@ -7,3 +7,9 @@ if(NOT TARGET bout++::bout++)
endif()

bout_add_example(hasegawa-wakatani SOURCES hw.cxx)

if(BOUT_HAS_CUDA)
set_source_files_properties(hw.cxx PROPERTIES LANGUAGE CUDA)
target_link_options(hasegawa-wakatani
PRIVATE "-L${CUDAToolkit_ROOT}/targets/x86_64-linux/lib")
endif()
2 changes: 2 additions & 0 deletions include/bout/fieldops.hxx
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Expand Up @@ -475,7 +475,9 @@ struct BinaryExpr {
} else if constexpr (is_expr_constant_v<R>) {
return lhs.numberParallelSlices();
} else {
#ifndef __CUDA_ARCH__
ASSERT2(lhs.numberParallelSlices() == rhs.numberParallelSlices());
#endif
return lhs.numberParallelSlices();
}
}
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