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Kokkos_OpenACC_ParallelReduce_MDRange.hpp
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Kokkos_OpenACC_ParallelReduce_MDRange.hpp
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//@HEADER
// ************************************************************************
//
// Kokkos v. 4.0
// Copyright (2022) National Technology & Engineering
// Solutions of Sandia, LLC (NTESS).
//
// Under the terms of Contract DE-NA0003525 with NTESS,
// the U.S. Government retains certain rights in this software.
//
// Part of Kokkos, under the Apache License v2.0 with LLVM Exceptions.
// See https://kokkos.org/LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//@HEADER
#ifndef KOKKOS_OPENACC_PARALLEL_REDUCE_MDRANGE_HPP
#define KOKKOS_OPENACC_PARALLEL_REDUCE_MDRANGE_HPP
#include <OpenACC/Kokkos_OpenACC.hpp>
#include <OpenACC/Kokkos_OpenACC_Macros.hpp>
#include <OpenACC/Kokkos_OpenACC_FunctorAdapter.hpp>
#include <OpenACC/Kokkos_OpenACC_MDRangePolicy.hpp>
#include <Kokkos_Parallel.hpp>
namespace Kokkos::Experimental::Impl {
// primary template: catch-all non-implemented custom reducers
template <class Functor, class Reducer, class Policy,
bool = std::is_arithmetic_v<typename Reducer::value_type>>
struct OpenACCParallelReduceMDRangeHelper {
OpenACCParallelReduceMDRangeHelper(Functor const&, Reducer const&,
Policy const&) {
static_assert(Kokkos::Impl::always_false<Functor>::value,
"not implemented");
}
};
} // namespace Kokkos::Experimental::Impl
template <class CombinedFunctorReducerType, class... Traits>
class Kokkos::Impl::ParallelReduce<CombinedFunctorReducerType,
Kokkos::MDRangePolicy<Traits...>,
Kokkos::Experimental::OpenACC> {
using Policy = MDRangePolicy<Traits...>;
using FunctorType = typename CombinedFunctorReducerType::functor_type;
using ReducerType = typename CombinedFunctorReducerType::reducer_type;
using Pointer = typename ReducerType::pointer_type;
using ValueType = typename ReducerType::value_type;
CombinedFunctorReducerType m_functor_reducer;
Policy m_policy;
Pointer m_result_ptr;
bool m_result_ptr_on_device;
public:
template <class ViewType>
ParallelReduce(const CombinedFunctorReducerType& functor_reducer,
const Policy& policy, const ViewType& result)
: m_functor_reducer(functor_reducer),
m_policy(policy),
m_result_ptr(result.data()),
m_result_ptr_on_device(
MemorySpaceAccess<Kokkos::Experimental::OpenACCSpace,
typename ViewType::memory_space>::accessible) {}
void execute() const {
static_assert(1 < Policy::rank && Policy::rank < 7);
static_assert(Policy::inner_direction == Iterate::Left ||
Policy::inner_direction == Iterate::Right);
constexpr int rank = Policy::rank;
ValueType val;
const ReducerType& reducer = m_functor_reducer.get_reducer();
reducer.init(&val);
for (int i = 0; i < rank; ++i) {
if (m_policy.m_lower[i] >= m_policy.m_upper[i]) {
if (m_result_ptr_on_device) {
acc_memcpy_to_device(m_result_ptr, &val, sizeof(ValueType));
} else {
*m_result_ptr = val;
}
return;
}
}
int const async_arg = m_policy.space().acc_async_queue();
Kokkos::Experimental::Impl::OpenACCParallelReduceMDRangeHelper(
Kokkos::Experimental::Impl::FunctorAdapter<
FunctorType, Policy,
Kokkos::Experimental::Impl::RoutineClause::seq>(
m_functor_reducer.get_functor()),
std::conditional_t<
std::is_same_v<FunctorType, typename ReducerType::functor_type>,
Sum<ValueType>, typename ReducerType::functor_type>(val),
m_policy);
// OpenACC backend supports only built-in Reducer types; thus
// reducer.final() below is a no-op.
reducer.final(&val);
// acc_wait(async_arg) in the below if-else statements is needed because the
// above OpenACC compute kernel can be executed asynchronously and val is a
// local host variable.
if (m_result_ptr_on_device) {
acc_memcpy_to_device_async(m_result_ptr, &val, sizeof(ValueType),
async_arg);
acc_wait(async_arg);
} else {
acc_wait(async_arg);
*m_result_ptr = val;
}
}
};
#define KOKKOS_IMPL_OPENACC_PARALLEL_REDUCE_DISPATCH_ITERATE(REDUCER, \
OPERATOR) \
namespace Kokkos::Experimental::Impl { \
template <class ValueType, class Functor> \
void OpenACCParallelReduce##REDUCER(OpenACCIterateLeft, ValueType& aval, \
Functor const& afunctor, \
OpenACCMDRangeBegin<2> const& begin, \
OpenACCMDRangeEnd<2> const& end, \
int async_arg) { \
auto val = aval; \
auto const functor(afunctor); \
int begin1 = begin[1]; \
int end1 = end[1]; \
int begin0 = begin[0]; \
int end0 = end[0]; \
/* clang-format off */ \
KOKKOS_IMPL_ACC_PRAGMA(parallel loop gang vector collapse(2) reduction(OPERATOR:val) copyin(functor) async(async_arg)) \
/* clang-format on */ \
for (auto i1 = begin1; i1 < end1; ++i1) { \
for (auto i0 = begin0; i0 < end0; ++i0) { \
functor(i0, i1, val); \
} \
} \
aval = val; \
} \
\
template <class ValueType, class Functor> \
void OpenACCParallelReduce##REDUCER(OpenACCIterateRight, ValueType& aval, \
Functor const& afunctor, \
OpenACCMDRangeBegin<2> const& begin, \
OpenACCMDRangeEnd<2> const& end, \
int async_arg) { \
auto val = aval; \
auto const functor(afunctor); \
int begin0 = begin[0]; \
int end0 = end[0]; \
int begin1 = begin[1]; \
int end1 = end[1]; \
/* clang-format off */ \
KOKKOS_IMPL_ACC_PRAGMA(parallel loop gang vector collapse(2) reduction(OPERATOR:val) copyin(functor) async(async_arg)) \
/* clang-format on */ \
for (auto i0 = begin0; i0 < end0; ++i0) { \
for (auto i1 = begin1; i1 < end1; ++i1) { \
functor(i0, i1, val); \
} \
} \
aval = val; \
} \
\
template <class ValueType, class Functor> \
void OpenACCParallelReduce##REDUCER(OpenACCIterateLeft, ValueType& aval, \
Functor const& afunctor, \
OpenACCMDRangeBegin<3> const& begin, \
OpenACCMDRangeEnd<3> const& end, \
int async_arg) { \
auto val = aval; \
auto const functor(afunctor); \
int begin2 = begin[2]; \
int end2 = end[2]; \
int begin1 = begin[1]; \
int end1 = end[1]; \
int begin0 = begin[0]; \
int end0 = end[0]; \
/* clang-format off */ \
KOKKOS_IMPL_ACC_PRAGMA(parallel loop gang vector collapse(3) reduction( \
OPERATOR \
: val) copyin(functor) async(async_arg)) \
/* clang-format on */ \
for (auto i2 = begin2; i2 < end2; ++i2) { \
for (auto i1 = begin1; i1 < end1; ++i1) { \
for (auto i0 = begin0; i0 < end0; ++i0) { \
functor(i0, i1, i2, val); \
} \
} \
} \
aval = val; \
} \
\
template <class ValueType, class Functor> \
void OpenACCParallelReduce##REDUCER(OpenACCIterateRight, ValueType& aval, \
Functor const& afunctor, \
OpenACCMDRangeBegin<3> const& begin, \
OpenACCMDRangeEnd<3> const& end, \
int async_arg) { \
auto val = aval; \
auto const functor(afunctor); \
int begin0 = begin[0]; \
int end0 = end[0]; \
int begin1 = begin[1]; \
int end1 = end[1]; \
int begin2 = begin[2]; \
int end2 = end[2]; \
/* clang-format off */ \
KOKKOS_IMPL_ACC_PRAGMA(parallel loop gang vector collapse(3) reduction( \
OPERATOR \
: val) copyin(functor) async(async_arg)) \
/* clang-format on */ \
for (auto i0 = begin0; i0 < end0; ++i0) { \
for (auto i1 = begin1; i1 < end1; ++i1) { \
for (auto i2 = begin2; i2 < end2; ++i2) { \
functor(i0, i1, i2, val); \
} \
} \
} \
aval = val; \
} \
\
template <class ValueType, class Functor> \
void OpenACCParallelReduce##REDUCER(OpenACCIterateLeft, ValueType& aval, \
Functor const& afunctor, \
OpenACCMDRangeBegin<4> const& begin, \
OpenACCMDRangeEnd<4> const& end, \
int async_arg) { \
auto val = aval; \
auto const functor(afunctor); \
int begin3 = begin[3]; \
int end3 = end[3]; \
int begin2 = begin[2]; \
int end2 = end[2]; \
int begin1 = begin[1]; \
int end1 = end[1]; \
int begin0 = begin[0]; \
int end0 = end[0]; \
/* clang-format off */ \
KOKKOS_IMPL_ACC_PRAGMA(parallel loop gang vector collapse(4) reduction(OPERATOR:val) copyin(functor) async(async_arg)) \
/* clang-format on */ \
for (auto i3 = begin3; i3 < end3; ++i3) { \
for (auto i2 = begin2; i2 < end2; ++i2) { \
for (auto i1 = begin1; i1 < end1; ++i1) { \
for (auto i0 = begin0; i0 < end0; ++i0) { \
functor(i0, i1, i2, i3, val); \
} \
} \
} \
} \
aval = val; \
} \
\
template <class ValueType, class Functor> \
void OpenACCParallelReduce##REDUCER(OpenACCIterateRight, ValueType& aval, \
Functor const& afunctor, \
OpenACCMDRangeBegin<4> const& begin, \
OpenACCMDRangeEnd<4> const& end, \
int async_arg) { \
auto val = aval; \
auto const functor(afunctor); \
int begin0 = begin[0]; \
int end0 = end[0]; \
int begin1 = begin[1]; \
int end1 = end[1]; \
int begin2 = begin[2]; \
int end2 = end[2]; \
int begin3 = begin[3]; \
int end3 = end[3]; \
/* clang-format off */ \
KOKKOS_IMPL_ACC_PRAGMA(parallel loop gang vector collapse(4) reduction(OPERATOR:val) copyin(functor) async(async_arg)) \
/* clang-format on */ \
for (auto i0 = begin0; i0 < end0; ++i0) { \
for (auto i1 = begin1; i1 < end1; ++i1) { \
for (auto i2 = begin2; i2 < end2; ++i2) { \
for (auto i3 = begin3; i3 < end3; ++i3) { \
functor(i0, i1, i2, i3, val); \
} \
} \
} \
} \
aval = val; \
} \
\
template <class ValueType, class Functor> \
void OpenACCParallelReduce##REDUCER(OpenACCIterateLeft, ValueType& aval, \
Functor const& afunctor, \
OpenACCMDRangeBegin<5> const& begin, \
OpenACCMDRangeEnd<5> const& end, \
int async_arg) { \
auto val = aval; \
auto const functor(afunctor); \
int begin4 = begin[4]; \
int end4 = end[4]; \
int begin3 = begin[3]; \
int end3 = end[3]; \
int begin2 = begin[2]; \
int end2 = end[2]; \
int begin1 = begin[1]; \
int end1 = end[1]; \
int begin0 = begin[0]; \
int end0 = end[0]; \
/* clang-format off */ \
KOKKOS_IMPL_ACC_PRAGMA(parallel loop gang vector collapse(5) reduction(OPERATOR:val) copyin(functor) async(async_arg)) \
/* clang-format on */ \
for (auto i4 = begin4; i4 < end4; ++i4) { \
for (auto i3 = begin3; i3 < end3; ++i3) { \
for (auto i2 = begin2; i2 < end2; ++i2) { \
for (auto i1 = begin1; i1 < end1; ++i1) { \
for (auto i0 = begin0; i0 < end0; ++i0) { \
functor(i0, i1, i2, i3, i4, val); \
} \
} \
} \
} \
} \
aval = val; \
} \
\
template <class ValueType, class Functor> \
void OpenACCParallelReduce##REDUCER(OpenACCIterateRight, ValueType& aval, \
Functor const& afunctor, \
OpenACCMDRangeBegin<5> const& begin, \
OpenACCMDRangeEnd<5> const& end, \
int async_arg) { \
auto val = aval; \
auto const functor(afunctor); \
int begin0 = begin[0]; \
int end0 = end[0]; \
int begin1 = begin[1]; \
int end1 = end[1]; \
int begin2 = begin[2]; \
int end2 = end[2]; \
int begin3 = begin[3]; \
int end3 = end[3]; \
int begin4 = begin[4]; \
int end4 = end[4]; \
/* clang-format off */ \
KOKKOS_IMPL_ACC_PRAGMA(parallel loop gang vector collapse(5) reduction(OPERATOR:val) copyin(functor) async(async_arg)) \
/* clang-format on */ \
for (auto i0 = begin0; i0 < end0; ++i0) { \
for (auto i1 = begin1; i1 < end1; ++i1) { \
for (auto i2 = begin2; i2 < end2; ++i2) { \
for (auto i3 = begin3; i3 < end3; ++i3) { \
for (auto i4 = begin4; i4 < end4; ++i4) { \
functor(i0, i1, i2, i3, i4, val); \
} \
} \
} \
} \
} \
aval = val; \
} \
\
template <class ValueType, class Functor> \
void OpenACCParallelReduce##REDUCER(OpenACCIterateLeft, ValueType& aval, \
Functor const& afunctor, \
OpenACCMDRangeBegin<6> const& begin, \
OpenACCMDRangeEnd<6> const& end, \
int async_arg) { \
auto val = aval; \
auto const functor(afunctor); \
int begin5 = begin[5]; \
int end5 = end[5]; \
int begin4 = begin[4]; \
int end4 = end[4]; \
int begin3 = begin[3]; \
int end3 = end[3]; \
int begin2 = begin[2]; \
int end2 = end[2]; \
int begin1 = begin[1]; \
int end1 = end[1]; \
int begin0 = begin[0]; \
int end0 = end[0]; \
/* clang-format off */ \
KOKKOS_IMPL_ACC_PRAGMA(parallel loop gang vector collapse(6) reduction(OPERATOR:val) copyin(functor) async(async_arg)) \
/* clang-format on */ \
for (auto i5 = begin5; i5 < end5; ++i5) { \
for (auto i4 = begin4; i4 < end4; ++i4) { \
for (auto i3 = begin3; i3 < end3; ++i3) { \
for (auto i2 = begin2; i2 < end2; ++i2) { \
for (auto i1 = begin1; i1 < end1; ++i1) { \
for (auto i0 = begin0; i0 < end0; ++i0) { \
functor(i0, i1, i2, i3, i4, i5, val); \
} \
} \
} \
} \
} \
} \
aval = val; \
} \
\
template <class ValueType, class Functor> \
void OpenACCParallelReduce##REDUCER(OpenACCIterateRight, ValueType& aval, \
Functor const& afunctor, \
OpenACCMDRangeBegin<6> const& begin, \
OpenACCMDRangeEnd<6> const& end, \
int async_arg) { \
auto val = aval; \
auto const functor(afunctor); \
int begin0 = begin[0]; \
int end0 = end[0]; \
int begin1 = begin[1]; \
int end1 = end[1]; \
int begin2 = begin[2]; \
int end2 = end[2]; \
int begin3 = begin[3]; \
int end3 = end[3]; \
int begin4 = begin[4]; \
int end4 = end[4]; \
int begin5 = begin[5]; \
int end5 = end[5]; \
/* clang-format off */ \
KOKKOS_IMPL_ACC_PRAGMA(parallel loop gang vector collapse(6) reduction(OPERATOR:val) copyin(functor) async(async_arg)) \
/* clang-format on */ \
for (auto i0 = begin0; i0 < end0; ++i0) { \
for (auto i1 = begin1; i1 < end1; ++i1) { \
for (auto i2 = begin2; i2 < end2; ++i2) { \
for (auto i3 = begin3; i3 < end3; ++i3) { \
for (auto i4 = begin4; i4 < end4; ++i4) { \
for (auto i5 = begin5; i5 < end5; ++i5) { \
functor(i0, i1, i2, i3, i4, i5, val); \
} \
} \
} \
} \
} \
} \
aval = val; \
} \
} // namespace Kokkos::Experimental::Impl
#define KOKKOS_IMPL_OPENACC_PARALLEL_REDUCE_MDRANGE_HELPER(REDUCER, OPERATOR) \
KOKKOS_IMPL_OPENACC_PARALLEL_REDUCE_DISPATCH_ITERATE(REDUCER, OPERATOR) \
template <class Functor, class Scalar, class Space, class... Traits> \
struct Kokkos::Experimental::Impl::OpenACCParallelReduceMDRangeHelper< \
Functor, Kokkos::REDUCER<Scalar, Space>, \
Kokkos::MDRangePolicy<Traits...>, true> { \
using Policy = MDRangePolicy<Traits...>; \
using Reducer = REDUCER<Scalar, Space>; \
using ValueType = typename Reducer::value_type; \
\
OpenACCParallelReduceMDRangeHelper(Functor const& functor, \
Reducer const& reducer, \
Policy const& policy) { \
ValueType val; \
reducer.init(val); \
\
int const async_arg = policy.space().acc_async_queue(); \
\
OpenACCParallelReduce##REDUCER( \
std::integral_constant<Iterate, Policy::inner_direction>(), val, \
functor, policy.m_lower, policy.m_upper, async_arg); \
\
reducer.reference() = val; \
} \
}
KOKKOS_IMPL_OPENACC_PARALLEL_REDUCE_MDRANGE_HELPER(Sum, +);
KOKKOS_IMPL_OPENACC_PARALLEL_REDUCE_MDRANGE_HELPER(Prod, *);
KOKKOS_IMPL_OPENACC_PARALLEL_REDUCE_MDRANGE_HELPER(Min, min);
KOKKOS_IMPL_OPENACC_PARALLEL_REDUCE_MDRANGE_HELPER(Max, max);
KOKKOS_IMPL_OPENACC_PARALLEL_REDUCE_MDRANGE_HELPER(LAnd, &&);
KOKKOS_IMPL_OPENACC_PARALLEL_REDUCE_MDRANGE_HELPER(LOr, ||);
KOKKOS_IMPL_OPENACC_PARALLEL_REDUCE_MDRANGE_HELPER(BAnd, &);
KOKKOS_IMPL_OPENACC_PARALLEL_REDUCE_MDRANGE_HELPER(BOr, |);
#undef KOKKOS_IMPL_OPENACC_PARALLEL_REDUCE_MDRANGE_HELPER
#undef KOKKOS_IMPL_OPENACC_PARALLEL_REDUCE_DISPATCH_ITERATE
#endif