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Implement occupancy for self-collision #815

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Implement occupancy for self-collision #815

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e981e11
Implement occupancy for self-collision
aprokop Jan 4, 2023
64478e3
Expose changing occupancy through a tuning variable
aprokop Jan 6, 2023
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23 changes: 19 additions & 4 deletions src/details/ArborX_DetailsHalfTraversal.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -12,13 +12,14 @@
#ifndef ARBORX_DETAILS_HALF_TRAVERSAL_HPP
#define ARBORX_DETAILS_HALF_TRAVERSAL_HPP

#include <ArborX_Callbacks.hpp> // LegacyCallbackWrapper
#include <ArborX_DetailsHappyTreeFriends.hpp>
#include <ArborX_DetailsLegacy.hpp>
#include <ArborX_DetailsNode.hpp> // ROPE_SENTINEL

#include <Kokkos_Core.hpp>

#include <cstdlib>

namespace ArborX::Details
{

Expand Down Expand Up @@ -46,9 +47,23 @@ struct HalfTraversal
}
else
{
Kokkos::parallel_for(
"ArborX::Experimental::HalfTraversal",
Kokkos::RangePolicy<ExecutionSpace>(space, 0, _bvh.size()), *this);
#if defined(KOKKOS_ENABLE_CUDA)
// While DesiredOccupancy option is only implemented for Cuda and is
// no-op for other backends, we don't want a surprise in the future once
// it's implemented for HIP. It is also unclear at this point what HIP
// value is going to be.
if constexpr (std::is_same_v<ExecutionSpace, Kokkos::Cuda>)
Kokkos::parallel_for(
"ArborX::Experimental::HalfTraversal",
Kokkos::Experimental::prefer(
Kokkos::RangePolicy<ExecutionSpace>(space, 0, _bvh.size()),
Kokkos::Experimental::DesiredOccupancy{Kokkos::AUTO}),
*this);
else
#endif
Kokkos::parallel_for(
"ArborX::Experimental::HalfTraversal",
Kokkos::RangePolicy<ExecutionSpace>(space, 0, _bvh.size()), *this);
}
}

Expand Down
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