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lammps/lib/kokkos/algorithms/src/Kokkos_Sort.hpp
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Kokkos_Sort.hpp
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/*
//@HEADER
// ************************************************************************
//
// Kokkos v. 2.0
// Copyright (2014) Sandia Corporation
//
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions? Contact H. Carter Edwards (hcedwar@sandia.gov)
//
// ************************************************************************
//@HEADER
*/
#ifndef KOKKOS_SORT_HPP_
#define KOKKOS_SORT_HPP_
#include <Kokkos_Core.hpp>
#include <algorithm>
namespace Kokkos {
namespace SortImpl {
template<class ValuesViewType, int Rank=ValuesViewType::Rank>
struct CopyOp;
template<class ValuesViewType>
struct CopyOp<ValuesViewType,1> {
template<class DstType, class SrcType>
KOKKOS_INLINE_FUNCTION
static void copy(DstType& dst, size_t i_dst,
SrcType& src, size_t i_src ) {
dst(i_dst) = src(i_src);
}
};
template<class ValuesViewType>
struct CopyOp<ValuesViewType,2> {
template<class DstType, class SrcType>
KOKKOS_INLINE_FUNCTION
static void copy(DstType& dst, size_t i_dst,
SrcType& src, size_t i_src ) {
for(int j = 0;j< (int) dst.dimension_1(); j++)
dst(i_dst,j) = src(i_src,j);
}
};
template<class ValuesViewType>
struct CopyOp<ValuesViewType,3> {
template<class DstType, class SrcType>
KOKKOS_INLINE_FUNCTION
static void copy(DstType& dst, size_t i_dst,
SrcType& src, size_t i_src ) {
for(int j = 0; j<dst.dimension_1(); j++)
for(int k = 0; k<dst.dimension_2(); k++)
dst(i_dst,j,k) = src(i_src,j,k);
}
};
}
template<class KeyViewType, class BinSortOp, class ExecutionSpace = typename KeyViewType::execution_space,
class SizeType = typename KeyViewType::memory_space::size_type>
class BinSort {
public:
template<class ValuesViewType, class PermuteViewType, class CopyOp>
struct bin_sort_sort_functor {
typedef ExecutionSpace execution_space;
typedef typename ValuesViewType::non_const_type values_view_type;
typedef typename ValuesViewType::const_type const_values_view_type;
Kokkos::View<typename values_view_type::const_data_type,typename values_view_type::array_layout,
typename values_view_type::memory_space,Kokkos::MemoryTraits<Kokkos::RandomAccess> > values;
values_view_type sorted_values;
typename PermuteViewType::const_type sort_order;
bin_sort_sort_functor(const_values_view_type values_, values_view_type sorted_values_, PermuteViewType sort_order_):
values(values_),sorted_values(sorted_values_),sort_order(sort_order_) {}
KOKKOS_INLINE_FUNCTION
void operator() (const int& i) const {
//printf("Sort: %i %i\n",i,sort_order(i));
CopyOp::copy(sorted_values,i,values,sort_order(i));
}
};
typedef ExecutionSpace execution_space;
typedef BinSortOp bin_op_type;
struct bin_count_tag {};
struct bin_offset_tag {};
struct bin_binning_tag {};
struct bin_sort_bins_tag {};
public:
typedef SizeType size_type;
typedef size_type value_type;
typedef Kokkos::View<size_type*, execution_space> offset_type;
typedef Kokkos::View<const int*, execution_space> bin_count_type;
typedef Kokkos::View<typename KeyViewType::const_data_type,
typename KeyViewType::array_layout,
typename KeyViewType::memory_space> const_key_view_type;
typedef Kokkos::View<typename KeyViewType::const_data_type,
typename KeyViewType::array_layout,
typename KeyViewType::memory_space,
Kokkos::MemoryTraits<Kokkos::RandomAccess> > const_rnd_key_view_type;
typedef typename KeyViewType::non_const_value_type non_const_key_scalar;
typedef typename KeyViewType::const_value_type const_key_scalar;
private:
const_key_view_type keys;
const_rnd_key_view_type keys_rnd;
public:
BinSortOp bin_op;
offset_type bin_offsets;
Kokkos::View<int*, ExecutionSpace, Kokkos::MemoryTraits<Kokkos::Atomic> > bin_count_atomic;
bin_count_type bin_count_const;
offset_type sort_order;
bool sort_within_bins;
public:
// Constructor: takes the keys, the binning_operator and optionally whether to sort within bins (default false)
BinSort(const_key_view_type keys_, BinSortOp bin_op_,
bool sort_within_bins_ = false)
:keys(keys_),keys_rnd(keys_), bin_op(bin_op_) {
bin_count_atomic = Kokkos::View<int*, ExecutionSpace >("Kokkos::SortImpl::BinSortFunctor::bin_count",bin_op.max_bins());
bin_count_const = bin_count_atomic;
bin_offsets = offset_type("Kokkos::SortImpl::BinSortFunctor::bin_offsets",bin_op.max_bins());
sort_order = offset_type("PermutationVector",keys.dimension_0());
sort_within_bins = sort_within_bins_;
}
// Create the permutation vector, the bin_offset array and the bin_count array. Can be called again if keys changed
void create_permute_vector() {
Kokkos::parallel_for (Kokkos::RangePolicy<ExecutionSpace,bin_count_tag> (0,keys.dimension_0()),*this);
Kokkos::parallel_scan(Kokkos::RangePolicy<ExecutionSpace,bin_offset_tag> (0,bin_op.max_bins()) ,*this);
Kokkos::deep_copy(bin_count_atomic,0);
Kokkos::parallel_for (Kokkos::RangePolicy<ExecutionSpace,bin_binning_tag> (0,keys.dimension_0()),*this);
if(sort_within_bins)
Kokkos::parallel_for (Kokkos::RangePolicy<ExecutionSpace,bin_sort_bins_tag>(0,bin_op.max_bins()) ,*this);
}
// Sort a view with respect ot the first dimension using the permutation array
template<class ValuesViewType>
void sort(ValuesViewType values) {
ValuesViewType sorted_values = ValuesViewType("Copy",
values.dimension_0(),
values.dimension_1(),
values.dimension_2(),
values.dimension_3(),
values.dimension_4(),
values.dimension_5(),
values.dimension_6(),
values.dimension_7());
parallel_for(values.dimension_0(),
bin_sort_sort_functor<ValuesViewType, offset_type,
SortImpl::CopyOp<ValuesViewType> >(values,sorted_values,sort_order));
deep_copy(values,sorted_values);
}
// Get the permutation vector
KOKKOS_INLINE_FUNCTION
offset_type get_permute_vector() const { return sort_order;}
// Get the start offsets for each bin
KOKKOS_INLINE_FUNCTION
offset_type get_bin_offsets() const { return bin_offsets;}
// Get the count for each bin
KOKKOS_INLINE_FUNCTION
bin_count_type get_bin_count() const {return bin_count_const;}
public:
KOKKOS_INLINE_FUNCTION
void operator() (const bin_count_tag& tag, const int& i) const {
bin_count_atomic(bin_op.bin(keys,i))++;
}
KOKKOS_INLINE_FUNCTION
void operator() (const bin_offset_tag& tag, const int& i, value_type& offset, const bool& final) const {
if(final) {
bin_offsets(i) = offset;
}
offset+=bin_count_const(i);
}
KOKKOS_INLINE_FUNCTION
void operator() (const bin_binning_tag& tag, const int& i) const {
const int bin = bin_op.bin(keys,i);
const int count = bin_count_atomic(bin)++;
sort_order(bin_offsets(bin) + count) = i;
}
KOKKOS_INLINE_FUNCTION
void operator() (const bin_sort_bins_tag& tag, const int&i ) const {
bool sorted = false;
int upper_bound = bin_offsets(i)+bin_count_const(i);
while(!sorted) {
sorted = true;
int old_idx = sort_order(bin_offsets(i));
int new_idx;
for(int k=bin_offsets(i)+1; k<upper_bound; k++) {
new_idx = sort_order(k);
if(!bin_op(keys_rnd,old_idx,new_idx)) {
sort_order(k-1) = new_idx;
sort_order(k) = old_idx;
sorted = false;
} else {
old_idx = new_idx;
}
}
upper_bound--;
}
}
};
namespace SortImpl {
template<class KeyViewType>
struct DefaultBinOp1D {
const int max_bins_;
const double mul_;
typename KeyViewType::const_value_type range_;
typename KeyViewType::const_value_type min_;
//Construct BinOp with number of bins, minimum value and maxuimum value
DefaultBinOp1D(int max_bins__, typename KeyViewType::const_value_type min,
typename KeyViewType::const_value_type max )
:max_bins_(max_bins__+1),mul_(1.0*max_bins__/(max-min)),range_(max-min),min_(min) {}
//Determine bin index from key value
template<class ViewType>
KOKKOS_INLINE_FUNCTION
int bin(ViewType& keys, const int& i) const {
return int(mul_*(keys(i)-min_));
}
//Return maximum bin index + 1
KOKKOS_INLINE_FUNCTION
int max_bins() const {
return max_bins_;
}
//Compare to keys within a bin if true new_val will be put before old_val
template<class ViewType, typename iType1, typename iType2>
KOKKOS_INLINE_FUNCTION
bool operator()(ViewType& keys, iType1& i1, iType2& i2) const {
return keys(i1)<keys(i2);
}
};
template<class KeyViewType>
struct DefaultBinOp3D {
int max_bins_[3];
double mul_[3];
typename KeyViewType::non_const_value_type range_[3];
typename KeyViewType::non_const_value_type min_[3];
DefaultBinOp3D(int max_bins__[], typename KeyViewType::const_value_type min[],
typename KeyViewType::const_value_type max[] )
{
max_bins_[0] = max_bins__[0]+1;
max_bins_[1] = max_bins__[1]+1;
max_bins_[2] = max_bins__[2]+1;
mul_[0] = 1.0*max_bins__[0]/(max[0]-min[0]);
mul_[1] = 1.0*max_bins__[1]/(max[1]-min[1]);
mul_[2] = 1.0*max_bins__[2]/(max[2]-min[2]);
range_[0] = max[0]-min[0];
range_[1] = max[1]-min[1];
range_[2] = max[2]-min[2];
min_[0] = min[0];
min_[1] = min[1];
min_[2] = min[2];
}
template<class ViewType>
KOKKOS_INLINE_FUNCTION
int bin(ViewType& keys, const int& i) const {
return int( (((int(mul_[0]*(keys(i,0)-min_[0]))*max_bins_[1]) +
int(mul_[1]*(keys(i,1)-min_[1])))*max_bins_[2]) +
int(mul_[2]*(keys(i,2)-min_[2])));
}
KOKKOS_INLINE_FUNCTION
int max_bins() const {
return max_bins_[0]*max_bins_[1]*max_bins_[2];
}
template<class ViewType, typename iType1, typename iType2>
KOKKOS_INLINE_FUNCTION
bool operator()(ViewType& keys, iType1& i1 , iType2& i2) const {
if (keys(i1,0)>keys(i2,0)) return true;
else if (keys(i1,0)==keys(i2,0)) {
if (keys(i1,1)>keys(i2,1)) return true;
else if (keys(i1,1)==keys(i2,2)) {
if (keys(i1,2)>keys(i2,2)) return true;
}
}
return false;
}
};
template<typename Scalar>
struct min_max {
Scalar min;
Scalar max;
bool init;
KOKKOS_INLINE_FUNCTION
min_max() {
min = 0;
max = 0;
init = 0;
}
KOKKOS_INLINE_FUNCTION
min_max (const min_max& val) {
min = val.min;
max = val.max;
init = val.init;
}
KOKKOS_INLINE_FUNCTION
min_max operator = (const min_max& val) {
min = val.min;
max = val.max;
init = val.init;
return *this;
}
KOKKOS_INLINE_FUNCTION
void operator+= (const Scalar& val) {
if(init) {
min = min<val?min:val;
max = max>val?max:val;
} else {
min = val;
max = val;
init = 1;
}
}
KOKKOS_INLINE_FUNCTION
void operator+= (const min_max& val) {
if(init && val.init) {
min = min<val.min?min:val.min;
max = max>val.max?max:val.max;
} else {
if(val.init) {
min = val.min;
max = val.max;
init = 1;
}
}
}
KOKKOS_INLINE_FUNCTION
void operator+= (volatile const Scalar& val) volatile {
if(init) {
min = min<val?min:val;
max = max>val?max:val;
} else {
min = val;
max = val;
init = 1;
}
}
KOKKOS_INLINE_FUNCTION
void operator+= (volatile const min_max& val) volatile {
if(init && val.init) {
min = min<val.min?min:val.min;
max = max>val.max?max:val.max;
} else {
if(val.init) {
min = val.min;
max = val.max;
init = 1;
}
}
}
};
template<class ViewType>
struct min_max_functor {
typedef typename ViewType::execution_space execution_space;
ViewType view;
typedef min_max<typename ViewType::non_const_value_type> value_type;
min_max_functor (const ViewType view_):view(view_) {
}
KOKKOS_INLINE_FUNCTION
void operator()(const size_t& i, value_type& val) const {
val += view(i);
}
};
template<class ViewType>
bool try_std_sort(ViewType view) {
bool possible = true;
#if ! defined( KOKKOS_USING_EXPERIMENTAL_VIEW )
size_t stride[8];
view.stride(stride);
#else
size_t stride[8] = { view.stride_0()
, view.stride_1()
, view.stride_2()
, view.stride_3()
, view.stride_4()
, view.stride_5()
, view.stride_6()
, view.stride_7()
};
#endif
possible = possible && Impl::is_same<typename ViewType::memory_space, HostSpace>::value;
possible = possible && (ViewType::Rank == 1);
possible = possible && (stride[0] == 1);
if(possible) {
std::sort(view.ptr_on_device(),view.ptr_on_device()+view.dimension_0());
}
return possible;
}
}
template<class ViewType>
void sort(ViewType view, bool always_use_kokkos_sort = false) {
if(!always_use_kokkos_sort) {
if(SortImpl::try_std_sort(view)) return;
}
typedef SortImpl::DefaultBinOp1D<ViewType> CompType;
SortImpl::min_max<typename ViewType::non_const_value_type> val;
parallel_reduce(view.dimension_0(),SortImpl::min_max_functor<ViewType>(view),val);
BinSort<ViewType, CompType> bin_sort(view,CompType(view.dimension_0()/2,val.min,val.max),true);
bin_sort.create_permute_vector();
bin_sort.sort(view);
}
/*template<class ViewType, class Comparator>
void sort(ViewType view, Comparator comp, bool always_use_kokkos_sort = false) {
}*/
}
#endif
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