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Kokkos_OpenACC_ParallelReduce_Range.hpp
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Kokkos_OpenACC_ParallelReduce_Range.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_RANGE_HPP
#define KOKKOS_OPENACC_PARALLEL_REDUCE_RANGE_HPP
#include <OpenACC/Kokkos_OpenACC.hpp>
#include <OpenACC/Kokkos_OpenACC_Macros.hpp>
#include <OpenACC/Kokkos_OpenACC_FunctorAdapter.hpp>
#include <OpenACC/Kokkos_OpenACC_ScheduleType.hpp>
#include <Kokkos_Parallel.hpp>
#include <type_traits>
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 OpenACCParallelReduceHelper {
OpenACCParallelReduceHelper(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::RangePolicy<Traits...>,
Kokkos::Experimental::OpenACC> {
using Policy = RangePolicy<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(CombinedFunctorReducerType const& functor_reducer,
Policy const& policy, ViewType const& 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 {
auto const begin = m_policy.begin();
auto const end = m_policy.end();
ValueType val;
ReducerType const& reducer = m_functor_reducer.get_reducer();
reducer.init(&val);
if (end <= begin) {
if (m_result_ptr_on_device == false) {
*m_result_ptr = val;
} else {
acc_memcpy_to_device(m_result_ptr, &val, sizeof(ValueType));
}
return;
}
int const async_arg = m_policy.space().acc_async_queue();
Kokkos::Experimental::Impl::OpenACCParallelReduceHelper(
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 == false) {
acc_wait(async_arg);
*m_result_ptr = val;
} else {
acc_memcpy_to_device_async(m_result_ptr, &val, sizeof(ValueType),
async_arg);
acc_wait(async_arg);
}
}
};
#define KOKKOS_IMPL_OPENACC_PARALLEL_REDUCE_DISPATCH_SCHEDULE(REDUCER, \
OPERATOR) \
namespace Kokkos::Experimental::Impl { \
template <class IndexType, class ValueType, class Functor> \
void OpenACCParallelReduce##REDUCER(Schedule<Static>, int chunk_size, \
IndexType begin, IndexType end, \
ValueType& aval, \
Functor const& afunctor, \
int async_arg) { \
/* FIXME_OPENACC FIXME_NVHPC workaround compiler bug (incorrect scope \
analysis) \
NVC++-S-1067-Cannot determine bounds for array - functor */ \
auto const functor(afunctor); \
auto val = aval; \
if (chunk_size >= 1) { \
/* clang-format off */ \
KOKKOS_IMPL_ACC_PRAGMA(parallel loop gang(static:chunk_size) vector reduction(OPERATOR:val) copyin(functor) async(async_arg)) \
/* clang-format on */ \
for (auto i = begin; i < end; i++) { \
functor(i, val); \
} \
} else { \
/* clang-format off */ \
KOKKOS_IMPL_ACC_PRAGMA(parallel loop gang(static:*) vector reduction(OPERATOR:val) copyin(functor) async(async_arg)) \
/* clang-format on */ \
for (auto i = begin; i < end; i++) { \
functor(i, val); \
} \
} \
aval = val; \
} \
\
template <class IndexType, class ValueType, class Functor> \
void OpenACCParallelReduce##REDUCER(Schedule<Dynamic>, int chunk_size, \
IndexType begin, IndexType end, \
ValueType& aval, \
Functor const& afunctor, \
int async_arg) { \
/* FIXME_OPENACC FIXME_NVHPC workaround compiler bug (incorrect scope \
analysis) \
NVC++-S-1067-Cannot determine bounds for array - functor */ \
auto const functor(afunctor); \
auto val = aval; \
if (chunk_size >= 1) { \
/* clang-format off */ \
KOKKOS_IMPL_ACC_PRAGMA(parallel loop gang(static:chunk_size) vector reduction(OPERATOR:val) copyin(functor) async(async_arg)) \
/* clang-format on */ \
for (auto i = begin; i < end; i++) { \
functor(i, val); \
} \
} else { \
/* clang-format off */ \
KOKKOS_IMPL_ACC_PRAGMA(parallel loop gang vector reduction(OPERATOR:val) copyin(functor) async(async_arg)) \
/* clang-format on */ \
for (auto i = begin; i < end; i++) { \
functor(i, val); \
} \
} \
aval = val; \
} \
} // namespace Kokkos::Experimental::Impl
#define KOKKOS_IMPL_OPENACC_PARALLEL_REDUCE_HELPER(REDUCER, OPERATOR) \
KOKKOS_IMPL_OPENACC_PARALLEL_REDUCE_DISPATCH_SCHEDULE(REDUCER, OPERATOR) \
template <class Functor, class Scalar, class Space, class... Traits> \
struct Kokkos::Experimental::Impl::OpenACCParallelReduceHelper< \
Functor, Kokkos::REDUCER<Scalar, Space>, Kokkos::RangePolicy<Traits...>, \
true> { \
using Policy = RangePolicy<Traits...>; \
using ScheduleType = \
Kokkos::Experimental::Impl::OpenACCScheduleType<Policy>; \
using Reducer = REDUCER<Scalar, Space>; \
using ValueType = typename Reducer::value_type; \
\
OpenACCParallelReduceHelper(Functor const& functor, \
Reducer const& reducer, \
Policy const& policy) { \
auto const begin = policy.begin(); \
auto const end = policy.end(); \
\
if (end <= begin) { \
return; \
} \
\
ValueType val; \
reducer.init(val); \
\
int const async_arg = policy.space().acc_async_queue(); \
int const chunk_size = policy.chunk_size(); \
\
OpenACCParallelReduce##REDUCER(ScheduleType(), chunk_size, begin, end, \
val, functor, async_arg); \
\
reducer.reference() = val; \
} \
}
KOKKOS_IMPL_OPENACC_PARALLEL_REDUCE_HELPER(Sum, +);
KOKKOS_IMPL_OPENACC_PARALLEL_REDUCE_HELPER(Prod, *);
KOKKOS_IMPL_OPENACC_PARALLEL_REDUCE_HELPER(Min, min);
KOKKOS_IMPL_OPENACC_PARALLEL_REDUCE_HELPER(Max, max);
KOKKOS_IMPL_OPENACC_PARALLEL_REDUCE_HELPER(LAnd, &&);
KOKKOS_IMPL_OPENACC_PARALLEL_REDUCE_HELPER(LOr, ||);
KOKKOS_IMPL_OPENACC_PARALLEL_REDUCE_HELPER(BAnd, &);
KOKKOS_IMPL_OPENACC_PARALLEL_REDUCE_HELPER(BOr, |);
#undef KOKKOS_IMPL_OPENACC_PARALLEL_REDUCE_HELPER
#undef KOKKOS_IMPL_OPENACC_PARALLEL_REDUCE_DISPATCH_SCHEDULE
#endif