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Kokkos_OpenACC_Team.hpp
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Kokkos_OpenACC_Team.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_TEAM_HPP
#define KOKKOS_OPENACC_TEAM_HPP
#include <openacc.h>
#include <impl/Kokkos_Traits.hpp>
#include <OpenACC/Kokkos_OpenACC.hpp>
#include <Kokkos_ExecPolicy.hpp>
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
namespace Kokkos {
namespace Impl {
class OpenACCTeamMember {
public:
constexpr static int TEAM_REDUCE_SIZE = 512;
// FIXME_OPENACC: default-team-size macros are temporarily used for
// team_size_max and team_size_recommended APIs
constexpr static int DEFAULT_TEAM_SIZE_MAX = 512;
constexpr static int DEFAULT_TEAM_SIZE_REC = 128;
using execution_space = Kokkos::Experimental::OpenACC;
using scratch_memory_space = execution_space::scratch_memory_space;
using team_handle = OpenACCTeamMember;
scratch_memory_space m_team_shared;
int m_team_scratch_size[2];
int m_team_rank;
int m_team_size;
int m_league_rank;
int m_league_size;
int m_vector_length;
public:
KOKKOS_FUNCTION
const execution_space::scratch_memory_space& team_shmem() const {
return m_team_shared.set_team_thread_mode(0, 1, 0);
}
KOKKOS_FUNCTION
const execution_space::scratch_memory_space& team_scratch(int level) const {
return m_team_shared.set_team_thread_mode(level, 1,
m_team_scratch_size[level]);
}
KOKKOS_FUNCTION
const execution_space::scratch_memory_space& thread_scratch(int level) const {
return m_team_shared.set_team_thread_mode(level, team_size(), team_rank());
}
KOKKOS_FUNCTION int league_rank() const { return m_league_rank; }
KOKKOS_FUNCTION int league_size() const { return m_league_size; }
KOKKOS_FUNCTION int team_rank() const { return m_team_rank; }
KOKKOS_FUNCTION int vector_length() const { return m_vector_length; }
KOKKOS_FUNCTION int team_size() const { return m_team_size; }
// FIXME_OPENACC: OpenACC does not provide any explicit barrier constructs
// for device kernels.
KOKKOS_FUNCTION void team_barrier() const {
Kokkos::abort(
"Kokkos::Experimental::OpenACC ERROR: OpenACC does not provide any "
"explicit barrier constructs for device kernels; exit!");
}
// FIXME_OPENACC: team_broadcast() is not implemented.
template <class ValueType>
KOKKOS_FUNCTION void team_broadcast(ValueType& value, int thread_id) const {
static_assert(Kokkos::Impl::always_false<ValueType>::value,
"Kokkos Error: team_broadcast() is not implemented for the "
"OpenACC backend");
return ValueType();
}
template <class Closure, class ValueType>
KOKKOS_FUNCTION void team_broadcast(const Closure& f, ValueType& value,
int thread_id) const {
f(value);
team_broadcast(value, thread_id);
}
// FIXME_OPENACC: team_reduce() is not implemented.
template <class ValueType, class JoinOp>
KOKKOS_FUNCTION ValueType team_reduce(const ValueType& value,
const JoinOp& op_in) const {
static_assert(Kokkos::Impl::always_false<ValueType>::value,
"Kokkos Error: team_reduce() is not implemented for the "
"OpenACC backend");
return ValueType();
}
// FIXME_OPENACC: team_scan() is not implemented.
template <typename ArgType>
KOKKOS_FUNCTION ArgType team_scan(const ArgType& /*value*/,
ArgType* const /*global_accum*/) const {
static_assert(
Kokkos::Impl::always_false<ArgType>::value,
"Kokkos Error: team_scan() is not implemented for the OpenACC backend");
return ArgType();
}
template <typename Type>
KOKKOS_FUNCTION Type team_scan(const Type& value) const {
return this->template team_scan<Type>(value, 0);
}
//----------------------------------------
// Private for the driver
private:
using space = execution_space::scratch_memory_space;
public:
// FIXME_OPENACC - 512(16*32) bytes at the begining of the scratch space
// for each league is saved for reduction. It should actually be based on the
// ValueType of the reduction variable.
OpenACCTeamMember(const int league_rank, const int league_size,
const int team_size,
const int vector_length) // const TeamPolicyInternal<
// OpenACC, Properties ...> & team
: m_team_size(team_size),
m_league_rank(league_rank),
m_league_size(league_size),
m_vector_length(vector_length) {
#ifdef KOKKOS_COMPILER_NVHPC
m_team_rank = __pgi_vectoridx();
#else
m_team_rank = 0;
#endif
}
static int team_reduce_size() { return TEAM_REDUCE_SIZE; }
};
template <class... Properties>
class TeamPolicyInternal<Kokkos::Experimental::OpenACC, Properties...>
: public PolicyTraits<Properties...> {
public:
//! Tag this class as a kokkos execution policy
using execution_policy = TeamPolicyInternal;
using traits = PolicyTraits<Properties...>;
//----------------------------------------
// FIXME_OPENACC: update team_size_max() APIs with realistic
// implementations.
template <class FunctorType>
static int team_size_max(const FunctorType&, const ParallelForTag&) {
return default_team_size_max;
}
template <class FunctorType>
static int team_size_max(const FunctorType&, const ParallelReduceTag&) {
return default_team_size_max;
}
template <class FunctorType, class ReducerType>
static int team_size_max(const FunctorType&, const ReducerType&,
const ParallelReduceTag&) {
return default_team_size_max;
}
// FIXME_OPENACC: update team_size_recommended() APIs with realistic
// implementations.
template <class FunctorType>
static int team_size_recommended(const FunctorType&, const ParallelForTag&) {
return default_team_size;
}
template <class FunctorType>
static int team_size_recommended(const FunctorType&,
const ParallelReduceTag&) {
return default_team_size;
}
template <class FunctorType, class ReducerType>
static int team_size_recommended(const FunctorType&, const ReducerType&,
const ParallelReduceTag&) {
return default_team_size;
}
//----------------------------------------
private:
int m_league_size;
int m_team_size;
int m_vector_length;
int m_team_alloc;
int m_team_iter;
std::array<size_t, 2> m_team_scratch_size;
std::array<size_t, 2> m_thread_scratch_size;
bool m_tune_team_size;
bool m_tune_vector_length;
constexpr static int default_team_size_max =
OpenACCTeamMember::DEFAULT_TEAM_SIZE_MAX;
constexpr static int default_team_size =
OpenACCTeamMember::DEFAULT_TEAM_SIZE_REC;
int m_chunk_size;
void init(const int league_size_request, const int team_size_request,
const int vector_length_request) {
m_league_size = league_size_request;
m_team_size = team_size_request;
m_vector_length = vector_length_request;
set_auto_chunk_size();
}
template <typename ExecSpace, typename... OtherProperties>
friend class TeamPolicyInternal;
public:
bool impl_auto_team_size() const { return m_tune_team_size; }
bool impl_auto_vector_length() const { return m_tune_vector_length; }
void impl_set_team_size(const int size) { m_team_size = size; }
void impl_set_vector_length(const int length) {
m_tune_vector_length = length;
}
int impl_vector_length() const { return m_vector_length; }
int team_size() const { return m_team_size; }
int league_size() const { return m_league_size; }
size_t scratch_size(const int& level, int team_size_ = -1) const {
if (team_size_ < 0) team_size_ = m_team_size;
return m_team_scratch_size[level] +
team_size_ * m_thread_scratch_size[level];
}
Kokkos::Experimental::OpenACC space() const {
return Kokkos::Experimental::OpenACC();
}
template <class... OtherProperties>
TeamPolicyInternal(const TeamPolicyInternal<OtherProperties...>& p)
: m_league_size(p.m_league_size),
m_team_size(p.m_team_size),
m_vector_length(p.m_vector_length),
m_team_alloc(p.m_team_alloc),
m_team_iter(p.m_team_iter),
m_team_scratch_size(p.m_team_scratch_size),
m_thread_scratch_size(p.m_thread_scratch_size),
m_tune_team_size(p.m_tune_team_size),
m_tune_vector_length(p.m_tune_vector_length),
m_chunk_size(p.m_chunk_size) {}
/** \brief Specify league size, request team size */
TeamPolicyInternal(const typename traits::execution_space&,
int league_size_request, int team_size_request,
int vector_length_request = 1)
: m_team_scratch_size{0, 0},
m_thread_scratch_size{0, 0},
m_tune_team_size(false),
m_tune_vector_length(false),
m_chunk_size(0) {
init(league_size_request, team_size_request, vector_length_request);
}
TeamPolicyInternal(const typename traits::execution_space&,
int league_size_request,
const Kokkos::AUTO_t& /* team_size_request */
,
int vector_length_request = 1)
: m_team_scratch_size{0, 0},
m_thread_scratch_size{0, 0},
m_tune_team_size(true),
m_tune_vector_length(false),
m_chunk_size(0) {
init(league_size_request, default_team_size / vector_length_request,
vector_length_request);
}
TeamPolicyInternal(const typename traits::execution_space&,
int league_size_request,
const Kokkos::AUTO_t& /* team_size_request */
,
const Kokkos::AUTO_t& /* vector_length_request */)
: m_team_scratch_size{0, 0},
m_thread_scratch_size{0, 0},
m_tune_team_size(true),
m_tune_vector_length(true),
m_chunk_size(0) {
init(league_size_request, default_team_size, 1);
}
TeamPolicyInternal(const typename traits::execution_space&,
int league_size_request, int team_size_request,
const Kokkos::AUTO_t& /* vector_length_request */)
: m_team_scratch_size{0, 0},
m_thread_scratch_size{0, 0},
m_tune_team_size(false),
m_tune_vector_length(true),
m_chunk_size(0) {
init(league_size_request, team_size_request, 1);
}
TeamPolicyInternal(int league_size_request, int team_size_request,
int vector_length_request = 1)
: m_team_scratch_size{0, 0},
m_thread_scratch_size{0, 0},
m_tune_team_size(false),
m_tune_vector_length(false),
m_chunk_size(0) {
init(league_size_request, team_size_request, vector_length_request);
}
TeamPolicyInternal(int league_size_request,
const Kokkos::AUTO_t& /* team_size_request */
,
int vector_length_request = 1)
: m_team_scratch_size{0, 0},
m_thread_scratch_size{0, 0},
m_tune_team_size(true),
m_tune_vector_length(false),
m_chunk_size(0) {
init(league_size_request, default_team_size / vector_length_request,
vector_length_request);
}
TeamPolicyInternal(int league_size_request,
const Kokkos::AUTO_t& /* team_size_request */
,
const Kokkos::AUTO_t& /* vector_length_request */)
: m_team_scratch_size{0, 0},
m_thread_scratch_size{0, 0},
m_tune_team_size(true),
m_tune_vector_length(true),
m_chunk_size(0) {
init(league_size_request, default_team_size, 1);
}
TeamPolicyInternal(int league_size_request, int team_size_request,
const Kokkos::AUTO_t& /* vector_length_request */)
: m_team_scratch_size{0, 0},
m_thread_scratch_size{0, 0},
m_tune_team_size(false),
m_tune_vector_length(true),
m_chunk_size(0) {
init(league_size_request, team_size_request, 1);
}
static int vector_length_max() {
return 32; /* TODO: this is bad. Need logic that is compiler and backend
aware */
}
int team_alloc() const { return m_team_alloc; }
int team_iter() const { return m_team_iter; }
int chunk_size() const { return m_chunk_size; }
/** \brief set chunk_size to a discrete value*/
TeamPolicyInternal& set_chunk_size(typename traits::index_type chunk_size_) {
m_chunk_size = chunk_size_;
return *this;
}
/** \brief set per team scratch size for a specific level of the scratch
* hierarchy */
TeamPolicyInternal& set_scratch_size(const int& level,
const PerTeamValue& per_team) {
m_team_scratch_size[level] = per_team.value;
return *this;
}
/** \brief set per thread scratch size for a specific level of the scratch
* hierarchy */
TeamPolicyInternal& set_scratch_size(const int& level,
const PerThreadValue& per_thread) {
m_thread_scratch_size[level] = per_thread.value;
return *this;
}
/** \brief set per thread and per team scratch size for a specific level of
* the scratch hierarchy */
TeamPolicyInternal& set_scratch_size(const int& level,
const PerTeamValue& per_team,
const PerThreadValue& per_thread) {
m_team_scratch_size[level] = per_team.value;
m_thread_scratch_size[level] = per_thread.value;
return *this;
}
private:
/** \brief finalize chunk_size if it was set to AUTO*/
void set_auto_chunk_size() {
int concurrency = 2048 * default_team_size;
if (m_chunk_size > 0) {
if (!Impl::is_integral_power_of_two(m_chunk_size))
Kokkos::abort("TeamPolicy blocking granularity must be power of two");
}
int new_chunk_size = 1;
while (new_chunk_size * 100 * concurrency < m_league_size)
new_chunk_size *= 2;
if (new_chunk_size < default_team_size) {
new_chunk_size = 1;
while ((new_chunk_size * 40 * concurrency < m_league_size) &&
(new_chunk_size < default_team_size))
new_chunk_size *= 2;
}
m_chunk_size = new_chunk_size;
}
public:
using member_type = Impl::OpenACCTeamMember;
};
} // namespace Impl
} // namespace Kokkos
namespace Kokkos {
namespace Impl {
template <typename iType>
struct TeamThreadRangeBoundariesStruct<iType, OpenACCTeamMember> {
using index_type = iType;
const iType start;
const iType end;
const OpenACCTeamMember& team;
TeamThreadRangeBoundariesStruct(const OpenACCTeamMember& thread_, iType count)
: start(0), end(count), team(thread_) {}
TeamThreadRangeBoundariesStruct(const OpenACCTeamMember& thread_,
iType begin_, iType end_)
: start(begin_), end(end_), team(thread_) {}
};
template <typename iType>
struct ThreadVectorRangeBoundariesStruct<iType, OpenACCTeamMember> {
using index_type = iType;
const index_type start;
const index_type end;
const OpenACCTeamMember& team;
ThreadVectorRangeBoundariesStruct(const OpenACCTeamMember& thread_,
index_type count)
: start(0), end(count), team(thread_) {}
ThreadVectorRangeBoundariesStruct(const OpenACCTeamMember& thread_,
index_type begin_, index_type end_)
: start(begin_), end(end_), team(thread_) {}
};
template <typename iType>
struct TeamVectorRangeBoundariesStruct<iType, OpenACCTeamMember> {
using index_type = iType;
const index_type start;
const index_type end;
const OpenACCTeamMember& team;
TeamVectorRangeBoundariesStruct(const OpenACCTeamMember& thread_,
index_type count)
: start(0), end(count), team(thread_) {}
TeamVectorRangeBoundariesStruct(const OpenACCTeamMember& thread_,
index_type begin_, index_type end_)
: start(begin_), end(end_), team(thread_) {}
};
} // namespace Impl
} // namespace Kokkos
namespace Kokkos {
template <typename iType>
KOKKOS_INLINE_FUNCTION
Impl::TeamThreadRangeBoundariesStruct<iType, Impl::OpenACCTeamMember>
TeamThreadRange(const Impl::OpenACCTeamMember& thread, const iType& count) {
return Impl::TeamThreadRangeBoundariesStruct<iType, Impl::OpenACCTeamMember>(
thread, count);
}
template <typename iType1, typename iType2>
KOKKOS_INLINE_FUNCTION Impl::TeamThreadRangeBoundariesStruct<
typename std::common_type<iType1, iType2>::type, Impl::OpenACCTeamMember>
TeamThreadRange(const Impl::OpenACCTeamMember& thread, const iType1& begin,
const iType2& end) {
using iType = typename std::common_type<iType1, iType2>::type;
return Impl::TeamThreadRangeBoundariesStruct<iType, Impl::OpenACCTeamMember>(
thread, iType(begin), iType(end));
}
template <typename iType>
KOKKOS_INLINE_FUNCTION
Impl::ThreadVectorRangeBoundariesStruct<iType, Impl::OpenACCTeamMember>
ThreadVectorRange(const Impl::OpenACCTeamMember& thread,
const iType& count) {
return Impl::ThreadVectorRangeBoundariesStruct<iType,
Impl::OpenACCTeamMember>(
thread, count);
}
template <typename iType1, typename iType2>
KOKKOS_INLINE_FUNCTION Impl::ThreadVectorRangeBoundariesStruct<
typename std::common_type<iType1, iType2>::type, Impl::OpenACCTeamMember>
ThreadVectorRange(const Impl::OpenACCTeamMember& thread,
const iType1& arg_begin, const iType2& arg_end) {
using iType = typename std::common_type<iType1, iType2>::type;
return Impl::ThreadVectorRangeBoundariesStruct<iType,
Impl::OpenACCTeamMember>(
thread, iType(arg_begin), iType(arg_end));
}
template <typename iType>
KOKKOS_INLINE_FUNCTION
Impl::TeamVectorRangeBoundariesStruct<iType, Impl::OpenACCTeamMember>
TeamVectorRange(const Impl::OpenACCTeamMember& thread, const iType& count) {
return Impl::TeamVectorRangeBoundariesStruct<iType, Impl::OpenACCTeamMember>(
thread, count);
}
template <typename iType1, typename iType2>
KOKKOS_INLINE_FUNCTION Impl::TeamVectorRangeBoundariesStruct<
typename std::common_type<iType1, iType2>::type, Impl::OpenACCTeamMember>
TeamVectorRange(const Impl::OpenACCTeamMember& thread, const iType1& arg_begin,
const iType2& arg_end) {
using iType = typename std::common_type<iType1, iType2>::type;
return Impl::TeamVectorRangeBoundariesStruct<iType, Impl::OpenACCTeamMember>(
thread, iType(arg_begin), iType(arg_end));
}
KOKKOS_INLINE_FUNCTION
Impl::ThreadSingleStruct<Impl::OpenACCTeamMember> PerTeam(
const Impl::OpenACCTeamMember& thread) {
return Impl::ThreadSingleStruct<Impl::OpenACCTeamMember>(thread);
}
KOKKOS_INLINE_FUNCTION
Impl::VectorSingleStruct<Impl::OpenACCTeamMember> PerThread(
const Impl::OpenACCTeamMember& thread) {
return Impl::VectorSingleStruct<Impl::OpenACCTeamMember>(thread);
}
} // namespace Kokkos
namespace Kokkos {
template <class FunctorType>
KOKKOS_INLINE_FUNCTION void single(
const Impl::VectorSingleStruct<Impl::OpenACCTeamMember>&
/*single_struct*/,
const FunctorType& lambda) {
lambda();
}
template <class FunctorType>
KOKKOS_INLINE_FUNCTION void single(
const Impl::ThreadSingleStruct<Impl::OpenACCTeamMember>& single_struct,
const FunctorType& lambda) {
if (single_struct.team_member.team_rank() == 0) lambda();
}
template <class FunctorType, class ValueType>
KOKKOS_INLINE_FUNCTION void single(
const Impl::VectorSingleStruct<Impl::OpenACCTeamMember>&
/*single_struct*/,
const FunctorType& lambda, ValueType& val) {
lambda(val);
}
template <class FunctorType, class ValueType>
KOKKOS_INLINE_FUNCTION void single(
const Impl::ThreadSingleStruct<Impl::OpenACCTeamMember>& single_struct,
const FunctorType& lambda, ValueType& val) {
if (single_struct.team_member.team_rank() == 0) {
lambda(val);
}
single_struct.team_member.team_broadcast(val, 0);
}
} // namespace Kokkos
#endif /* #ifndef KOKKOS_OPENACC_TEAM_HPP */