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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkDIYDataExchanger.h"
#include "vtkDIYUtilities.h"
#include "vtkDataSet.h"
#include "vtkLogger.h"
#include "vtkMultiProcessController.h"
#include "vtkObjectFactory.h"
// clang-format off
#include "vtk_diy2.h"
// #define DIY_USE_SPDLOG
#include VTK_DIY2(diy/mpi.hpp)
#include VTK_DIY2(diy/master.hpp)
#include VTK_DIY2(diy/link.hpp)
#include VTK_DIY2(diy/reduce.hpp)
#include VTK_DIY2(diy/reduce-operations.hpp)
#include VTK_DIY2(diy/partners/swap.hpp)
#include VTK_DIY2(diy/algorithms.hpp)
// clang-format on
#include <functional>
VTK_ABI_NAMESPACE_BEGIN
vtkStandardNewMacro(vtkDIYDataExchanger);
vtkCxxSetObjectMacro(vtkDIYDataExchanger, Controller, vtkMultiProcessController);
//------------------------------------------------------------------------------
vtkDIYDataExchanger::vtkDIYDataExchanger()
: Controller(nullptr)
{
this->SetController(vtkMultiProcessController::GetGlobalController());
}
//------------------------------------------------------------------------------
vtkDIYDataExchanger::~vtkDIYDataExchanger()
{
this->SetController(nullptr);
}
//------------------------------------------------------------------------------
bool vtkDIYDataExchanger::AllToAll(const std::vector<vtkSmartPointer<vtkDataSet>>& sendBuffer,
const std::vector<int>& sendCounts, std::vector<vtkSmartPointer<vtkDataSet>>& recvBuffer,
std::vector<int>& recvCounts)
{
if (this->Controller == nullptr || (this->Controller->GetNumberOfProcesses() <= 1))
{
recvBuffer = sendBuffer;
recvCounts = sendCounts;
return true;
}
if (static_cast<int>(sendCounts.size()) != this->Controller->GetNumberOfProcesses())
{
vtkErrorMacro("`sendCounts` size (" << sendCounts.size() << ") must match the number of ranks ("
<< this->Controller->GetNumberOfProcesses() << ").");
return false;
}
diy::mpi::communicator comm = vtkDIYUtilities::GetCommunicator(this->Controller);
assert(static_cast<int>(sendCounts.size()) == comm.size());
std::vector<int> offsets(comm.size(), 0);
for (int cc = 1; cc < comm.size(); ++cc)
{
offsets[cc] = offsets[cc - 1] + sendCounts[cc - 1];
}
assert((offsets.back() + sendCounts.back()) == static_cast<int>(sendBuffer.size()));
// collect information from all ranks about who has data from whom. this helps
// us setup links.
std::vector<std::vector<int>> allCounts;
diy::mpi::all_gather(comm, sendCounts, allCounts);
using VectorOfDataSet = std::vector<vtkSmartPointer<vtkDataSet>>;
using VectorOfVectorOfDataSet = std::vector<VectorOfDataSet>;
using BlockT = VectorOfVectorOfDataSet;
diy::Master master(
comm, 1, -1, []() { return static_cast<void*>(new BlockT()); },
[](void* b) { delete static_cast<BlockT*>(b); });
// note: each rank gets 1 DIY-block.
diy::ContiguousAssigner assigner(comm.size(), comm.size());
auto link = new diy::Link();
// add neighbours.
for (int gid = 0; gid < comm.size(); ++gid)
{
if (allCounts[comm.rank()][gid] > 0 || allCounts[gid][comm.rank()] > 0)
{
link->add_neighbor(diy::BlockID(gid, assigner.rank(gid)));
}
}
auto block = new BlockT(comm.size());
for (int rank = 0; rank < comm.size(); ++rank)
{
if (rank == comm.rank())
{
continue;
}
auto& tosend_vector = (*block)[rank];
tosend_vector.resize(sendCounts[rank]);
std::copy_n(
std::next(sendBuffer.begin(), offsets[rank]), sendCounts[rank], tosend_vector.begin());
}
master.add(/*gid=*/comm.rank(), block, link);
master.foreach ([](BlockT* b, const diy::Master::ProxyWithLink& cp) {
for (const auto& neighbor : cp.link()->neighbors())
{
if (neighbor.gid == cp.gid())
{
continue;
} // don't enqueue for self
auto& vector_of_ds = (*b)[neighbor.gid];
// cp.enqueue(neighbor, static_cast<int>(vector_of_ds.size()));
for (auto& ds : vector_of_ds)
{
vtkLogF(TRACE, "enqueue for %d (%p)", neighbor.gid, ds.GetPointer());
cp.enqueue<vtkDataSet*>(neighbor, ds.GetPointer());
}
vector_of_ds.clear();
}
});
master.exchange();
master.foreach (
[&offsets, &sendBuffer, &sendCounts](BlockT* b, const diy::Master::ProxyWithLink& cp) {
for (const auto& neighbor : cp.link()->neighbors())
{
auto& vector_of_ds = (*b)[neighbor.gid];
if (neighbor.gid == cp.gid())
{
// self; push data directly from sendBuffer.
for (int cc = offsets[cp.gid()], max = offsets[cp.gid()] + sendCounts[cp.gid()]; cc < max;
++cc)
{
vector_of_ds.push_back(sendBuffer[cc]);
}
}
else
{
while (cp.incoming(neighbor.gid))
{
vtkDataSet* ptr = nullptr;
vtkLogF(TRACE, "dequeue from %d", neighbor.gid);
cp.dequeue<vtkDataSet*>(neighbor, ptr);
vector_of_ds.push_back(vtkSmartPointer<vtkDataSet>::Take(ptr));
}
}
}
});
block = master.get<BlockT>(0);
assert(block != nullptr && static_cast<int>(block->size()) == comm.size());
recvBuffer.clear();
recvCounts.clear();
recvCounts.resize(comm.size(), 0);
for (int rank = 0; rank < comm.size(); ++rank)
{
const auto& vector_of_ds = (*block)[rank];
recvCounts[rank] = static_cast<int>(vector_of_ds.size());
recvBuffer.insert(recvBuffer.end(), vector_of_ds.begin(), vector_of_ds.end());
}
return true;
}
//------------------------------------------------------------------------------
void vtkDIYDataExchanger::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
os << indent << "Controller: " << this->Controller << endl;
}
VTK_ABI_NAMESPACE_END
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