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Fix data access on device #312

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Merged
julianlitz merged 1 commit into from
Aug 13, 2026
+19 −9
Merged

Fix data access on device #312

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2 changes: 0 additions & 2 deletions include/GMGPolar/gmgpolar.h
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Original file line number Diff line number Diff line change
Expand Up @@ -207,8 +207,6 @@ class GMGPolar : public IGMGPolar
/* Visualization */
public: // Public due to cuda restrictions
void writeToVTK(const std::filesystem::path& file_path, const PolarGrid& grid);

private:
void writeToVTK(const std::filesystem::path& file_path, const LevelType& level,
HostConstVector<double> grid_function);
};
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26 changes: 19 additions & 7 deletions include/GMGPolar/utils.h
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Expand Up @@ -220,8 +220,10 @@ void GMGPolar<DomainGeometry, DensityProfileCoefficients>::writeToVTK(const std:
Fx(index) = domain_geometry.Fx(r, theta);
Fy(index) = domain_geometry.Fy(r, theta);
});
HostVector<double> Fx_h = Kokkos::create_mirror_view_and_copy(Kokkos::HostSpace(), Fx);
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HostVector<double> Fy_h = Kokkos::create_mirror_view_and_copy(Kokkos::HostSpace(), Fy);
for (int index = 0; index < grid.numberOfNodes(); index++) {
file << Fx(index) << " " << Fy(index) << " " << 0 << "\n";
file << Fx_h(index) << " " << Fy_h(index) << " " << 0 << "\n";
}
file << "</DataArray>\n"
<< "</Points>\n";
Expand Down Expand Up @@ -280,13 +282,23 @@ void GMGPolar<DomainGeometry, DensityProfileCoefficients>::writeToVTK(const std:
// Write points
file << "<Points>\n"
<< "<DataArray type=\"Float64\" NumberOfComponents=\"3\" format=\"ascii\">\n";
int i_r, i_theta;
double r, theta;
Vector<double> Fx("Fx", grid.numberOfNodes());
Vector<double> Fy("Fy", grid.numberOfNodes());
const DomainGeometry& domain_geometry = domain_geometry_;
Kokkos::parallel_for(
"collect Fx,Fy", Kokkos::RangePolicy<Kokkos::DefaultExecutionSpace>(0, grid.numberOfNodes()),
KOKKOS_LAMBDA(int index) {
int i_r, i_theta;
grid.multiIndex(index, i_r, i_theta);
double r = grid.radius(i_r);
double theta = grid.theta(i_theta);
Fx(index) = domain_geometry.Fx(r, theta);
Fy(index) = domain_geometry.Fy(r, theta);
});
HostVector<double> Fx_h = Kokkos::create_mirror_view_and_copy(Kokkos::HostSpace(), Fx);
HostVector<double> Fy_h = Kokkos::create_mirror_view_and_copy(Kokkos::HostSpace(), Fy);
for (int index = 0; index < grid.numberOfNodes(); index++) {
grid.multiIndex(index, i_r, i_theta);
r = grid.radius(i_r);
theta = grid.theta(i_theta);
file << domain_geometry_.Fx(r, theta) << " " << domain_geometry_.Fy(r, theta) << " " << 0 << "\n";
file << Fx_h(index) << " " << Fy_h(index) << " " << 0 << "\n";
}

file << "</DataArray>\n"
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