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PVSlice.cpp
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// SPDX-License-Identifier: BSD-3-Clause
// deprecated
#include "sharpy/PVSlice.hpp"
namespace SHARPY {
using offsets_type = std::vector<uint64_t>;
BasePVSlice::BasePVSlice(const shape_type &shape, int split)
: _offset(split == NOSPLIT
? 0
: (shape[split] + getTransceiver()->nranks() - 1) /
getTransceiver()->nranks()),
_shape(shape), _split_dim(split) {
_tile_size = VPROD(_shape) / shape[_split_dim] * _offset;
}
BasePVSlice::BasePVSlice(shape_type &&shape, int split)
: _offset(split == NOSPLIT
? 0
: (shape[split] + getTransceiver()->nranks() - 1) /
getTransceiver()->nranks()),
_shape(std::move(shape)), _split_dim(split) {
if (_split_dim == NOSPLIT)
_tile_size = VPROD(_shape);
else
_tile_size =
_shape.size() ? VPROD(_shape) / _shape[_split_dim] * _offset : 1;
}
bool BasePVSlice::is_equally_tiled() const {
return _shape[_split_dim] == getTransceiver()->nranks() * _offset;
}
uint64_t BasePVSlice::offset() const { return _offset; }
uint64_t BasePVSlice::tile_size(rank_type rank) const {
// only rank 0 is guaranteed to have _tile_size, all other parts can be <
// _tile_size
if (rank == 0)
return _tile_size;
auto sz = VPROD(_shape);
auto off = rank * _tile_size;
if (sz >= off)
return _tile_size;
auto r = off - sz;
// if r < _tile_size it's the remainder, otherwise we are past the end of the
// global array
return r < _tile_size ? r : 0UL;
}
shape_type BasePVSlice::tile_shape(rank_type rank) const {
// only rank 0 is guaranteed to have _tile_size, all other parts can be <
// _tile_size
shape_type r(_shape);
if (rank == 0)
r[_split_dim] = offset();
else {
auto end = (rank + 1) * offset();
if (r[_split_dim] >= end)
r[_split_dim] = offset();
else {
auto diff = end - r[_split_dim];
// if diff < offset() it's the remainder, otherwise we are past the end of
// the global array
r[_split_dim] = diff < offset() ? offset() - diff : 0UL;
}
}
return r;
}
int BasePVSlice::split_dim() const { return _split_dim; }
const shape_type &BasePVSlice::shape() const { return _shape; }
rank_type BasePVSlice::owner(const NDSlice &slice) const {
return split_dim() == NOSPLIT ? getTransceiver()->rank()
: slice.dim(split_dim())._start / offset();
}
PVSlice::PVSlice(const shape_type &shp, int split)
: _slice(shp), _base(std::make_shared<BasePVSlice>(shp, split)), _shape() {}
PVSlice::PVSlice(shape_type &&shp, int split)
: _slice(shp), // std::move in next line
_base(std::make_shared<BasePVSlice>(std::move(shp), split)), _shape() {}
PVSlice::PVSlice(const shape_type &shp, const NDSlice &slc, int split)
: _slice(slc), _base(std::make_shared<BasePVSlice>(shp, split)), _shape() {}
PVSlice::PVSlice(shape_type &&shp, NDSlice &&slc, int split)
: _slice(std::move(slc)),
_base(std::make_shared<BasePVSlice>(std::move(shp), split)), _shape() {}
PVSlice::PVSlice(const PVSlice &org, const NDSlice &slice)
: _slice(std::move(org._slice.slice(slice))), _base(org._base), _shape() {}
PVSlice::PVSlice(const PVSlice &org, rank_type rank)
: _slice(std::move(org.local_slice(rank))), _base(org._base), _shape() {}
PVSlice::PVSlice(BasePVSlicePtr bp, const NDSlice &slice)
: _slice(slice), _base(bp), _shape() {}
uint64_t PVSlice::ndims() const { return _slice.ndims(); }
int PVSlice::split_dim() const { return _base->split_dim(); }
bool PVSlice::is_sliced() const { return base_shape() != shape(); }
bool PVSlice::local_is_contiguous(rank_type rank) const {
if (split_dim() != 0) {
throw std::runtime_error("Only split_dim == 0 is supported.");
}
auto tshp = tile_shape(rank);
auto tslc = tile_slice(rank);
for (auto i = 0; i < ndims(); ++i) {
auto slci = tslc.dim(i);
if (slci._step != 1 || (slci._start > 0 && i > 0) ||
(slci._end < tshp[i] && i > 0))
return false;
}
return true;
}
bool PVSlice::is_equally_tiled() const { return _base->is_equally_tiled(); }
const NDSlice &PVSlice::slice() const { return _slice; }
const shape_type &PVSlice::shape() const {
if (_shape.size() != _slice.ndims()) {
_shape.resize(_slice.ndims());
int i = -1;
for (auto &shp : _shape)
shp = _slice.dim(++i).size();
}
return _shape;
}
uint64_t PVSlice::size() const { return slice().size(); }
uint64_t PVSlice::tile_size(rank_type rank) const {
return _base->tile_size(rank);
}
shape_type PVSlice::tile_shape(rank_type rank) const {
return _base->tile_shape(rank);
}
NDSlice PVSlice::tile_slice(rank_type rank) const {
if (_base->split_dim() == NOSPLIT) {
return rank == getTransceiver()->rank() ? slice() : NDSlice();
}
return _slice.trim_shift(_base->split_dim(), rank * _base->offset(),
(rank + 1) * _base->offset(),
rank * _base->offset());
}
NDSlice PVSlice::local_slice(rank_type rank) const {
if (_base->split_dim() == NOSPLIT) {
return rank == getTransceiver()->rank() ? slice() : NDSlice();
}
return _slice.trim(_base->split_dim(), rank * _base->offset(),
(rank + 1) * _base->offset());
}
shape_type PVSlice::local_shape(rank_type rank) const {
return local_slice(rank).shape();
}
uint64_t PVSlice::local_size(rank_type rank) const {
return local_slice(rank).size();
}
const shape_type &PVSlice::base_shape() const { return _base->shape(); }
rank_type PVSlice::owner(const NDSlice &slice) const {
return _base->owner(slice);
}
#if 0
NDSlice PVSlice::normalized_slice() const
{
return _slice.normalize(_base->split_dim());
}
#endif
NDSlice PVSlice::map_slice(const NDSlice &slc) const { return _slice.map(slc); }
std::array<std::vector<NDSlice>, 2>
PVSlice::map_ranks(const PVSlice &o_slc) const {
auto o_sz = o_slc.size();
auto d_sz = size();
if (d_sz <= 1 && o_sz > 1)
throw std::runtime_error("Cannot map nd-array to scalar/0d-array.");
if (o_sz <= 1)
return {};
auto nr = getTransceiver()->nranks();
std::vector<NDSlice> sends(nr);
std::vector<NDSlice> recvs(nr);
// rank's slice of origin, relative to o_slc
auto my_o_slc = o_slc.map_slice(o_slc.local_slice());
// rank's slice of destination, relative to d_slc
auto my_d_slc = this->map_slice(this->local_slice());
for (auto r = 0; r < nr; ++r) {
// determine what I receive from rank r
// e.g. which parts of my destination slice overlap with rank r's origin
// slice Get local slice of rank r of origin array
auto r_o_slc = o_slc.map_slice(o_slc.local_slice(r));
// Determine overlap with my destination
auto roverlap = my_d_slc.overlap(r_o_slc);
// push to result
recvs[r] = std::move(roverlap);
// determine what I send to rank r
// e.g. which parts of my origin slice overlap with rank r's destination
// slice Get local slice of rank r of destination array
auto r_d_slc = this->map_slice(this->local_slice(r));
// Determine overlap with my destination
auto soverlap = my_o_slc.overlap(r_d_slc);
// push to result
sends[r] = std::move(soverlap);
}
return {sends, recvs};
}
bool PVSlice::need_reduce(const dim_vec_type &dims) const {
if (_base->split_dim() == NOSPLIT)
return false;
auto nd = dims.size();
// Reducing to a single scalar or over a subset of dimensions *including* the
// split axis.
if (nd == 0 || nd == _slice.ndims() ||
std::find(dims.begin(), dims.end(), _base->split_dim()) != dims.end())
return true;
// *not* reducing over split axis
return false;
} ///
std::ostream &operator<<(std::ostream &output, const PVSlice &slc) {
output << "{slice=" << slc.slice() << "base=" << to_string(slc._base->shape())
<< "offset=" << slc._base->offset() << "}";
return output;
}
} // namespace SHARPY