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CudaWrappers::MatrixFree: Only create required host mirrors #15777

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Jul 21, 2023
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CudaWrappers::MatrixFree: Only create required host mirrors #15777

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44 changes: 29 additions & 15 deletions include/deal.II/matrix_free/cuda_matrix_free.templates.h
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Original file line number Diff line number Diff line change
Expand Up @@ -200,25 +200,36 @@ namespace CUDAWrappers
auto constraint_mask_host =
Kokkos::create_mirror_view(data->constraint_mask[color]);

typename std::remove_reference_t<decltype(
data->q_points[color])>::HostMirror q_points_host;
typename std::remove_reference_t<decltype(data->JxW[color])>::HostMirror
JxW_host;
typename std::remove_reference_t<decltype(
data->inv_jacobian[color])>::HostMirror inv_jacobian_host;
#if KOKKOS_VERSION >= 30600
auto local_to_global_host =
Kokkos::create_mirror_view(Kokkos::WithoutInitializing,
data->local_to_global[color]);
auto q_points_host =
Kokkos::create_mirror_view(Kokkos::WithoutInitializing,
data->q_points[color]);
auto JxW_host = Kokkos::create_mirror_view(Kokkos::WithoutInitializing,
data->JxW[color]);
auto inv_jacobian_host =
Kokkos::create_mirror_view(Kokkos::WithoutInitializing,
data->inv_jacobian[color]);
if (update_flags & update_quadrature_points)
q_points_host = Kokkos::create_mirror_view(Kokkos::WithoutInitializing,
data->q_points[color]);
if (update_flags & update_JxW_values)
JxW_host = Kokkos::create_mirror_view(Kokkos::WithoutInitializing,
data->JxW[color]);
if (update_flags & update_gradients)
inv_jacobian_host =
Kokkos::create_mirror_view(Kokkos::WithoutInitializing,
data->inv_jacobian[color]);
#else
auto local_to_global_host =
Kokkos::create_mirror_view(data->local_to_global[color]);
auto q_points_host = Kokkos::create_mirror_view(data->q_points[color]);
auto JxW_host = Kokkos::create_mirror_view(data->JxW[color]);
auto inv_jacobian_host =
Kokkos::create_mirror_view(data->inv_jacobian[color]);
if (update_flags & update_quadrature_points)
q_points_host = Kokkos::create_mirror_view(data->q_points[color]);
if (update_flags & update_JxW_values)
JxW_host = Kokkos::create_mirror_view(data->JxW[color]);
if (update_flags & update_gradients)
inv_jacobian_host =
Kokkos::create_mirror_view(data->inv_jacobian[color]);
#endif

auto cell = graph.cbegin(), end_cell = graph.cend();
Expand Down Expand Up @@ -277,9 +288,12 @@ namespace CUDAWrappers
// Copy the data to the device
Kokkos::deep_copy(data->constraint_mask[color], constraint_mask_host);
Kokkos::deep_copy(data->local_to_global[color], local_to_global_host);
Kokkos::deep_copy(data->q_points[color], q_points_host);
Kokkos::deep_copy(data->JxW[color], JxW_host);
Kokkos::deep_copy(data->inv_jacobian[color], inv_jacobian_host);
if (update_flags & update_quadrature_points)
Kokkos::deep_copy(data->q_points[color], q_points_host);
if (update_flags & update_JxW_values)
Kokkos::deep_copy(data->JxW[color], JxW_host);
if (update_flags & update_gradients)
Kokkos::deep_copy(data->inv_jacobian[color], inv_jacobian_host);
}


Expand Down