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/* Copyright 2019-2020 Andrew Myers, Axel Huebl,
* Maxence Thevenet
*
* This file is part of WarpX.
*
* License: BSD-3-Clause-LBNL
*/
#ifndef SMART_COPY_H_
#define SMART_COPY_H_
#include <DefaultInitialization.H>
#include <AMReX_GpuContainers.H>
#include <AMReX_ParallelDescriptor.H>
#include <map>
#include <string>
using NameMap = std::map<std::string, int>;
using PolicyVec = amrex::Gpu::DeviceVector<InitializationPolicy>;
struct SmartCopyTag
{
std::vector<std::string> common_names;
amrex::Gpu::DeviceVector<int> src_comps;
amrex::Gpu::DeviceVector<int> dst_comps;
int size () const noexcept { return common_names.size(); }
};
PolicyVec getPolicies (const NameMap& names) noexcept;
SmartCopyTag getSmartCopyTag (const NameMap& src, const NameMap& dst) noexcept;
/**
* \brief Sets the ids of newly created particles to the next values.
*
* \tparam PTile the particle tile type
*
* \param ptile the particle tile
* \param old_size the index of the first new particle
* \param num_added the number of particles to set the ids for.
*/
template <typename PTile>
void setNewParticleIDs (PTile& ptile, int old_size, int num_added)
{
int pid;
#ifdef _OPENMP
#pragma omp critical (ionization_nextid)
#endif
{
pid = PTile::ParticleType::NextID();
PTile::ParticleType::NextID(pid + num_added);
}
const int cpuid = amrex::ParallelDescriptor::MyProc();
auto pp = ptile.GetArrayOfStructs()().data() + old_size;
amrex::ParallelFor(num_added, [=] AMREX_GPU_DEVICE (int ip) noexcept
{
auto& p = pp[ip];
p.id() = pid+ip;
p.cpu() = cpuid;
});
}
/**
* \brief This is a functor for performing a "smart copy" that works
* in both host and device code.
*
* A "smart" copy does the following. First, the destination particle
* components are initialized to the default values for that component
* type. Second, if a given component name is found in both the src
* and the dst, then the src value is copied.
*
* Particle structs - positions and id numbers - are always copied.
*
* You don't create this directly - use the SmartCopyFactory object below.
*/
struct SmartCopy
{
int m_num_copy_real;
const int* m_src_comps_r;
const int* m_dst_comps_r;
int m_num_copy_int;
const int* m_src_comps_i;
const int* m_dst_comps_i;
const InitializationPolicy* m_policy_real;
const InitializationPolicy* m_policy_int;
template <typename DstData, typename SrcData>
AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE
void operator() (DstData& dst, const SrcData& src, int i_src, int i_dst) const noexcept
{
// the particle struct is always copied over
dst.m_aos[i_dst] = src.m_aos[i_src];
// initialize the real components
for (int j = 0; j < DstData::NAR; ++j)
dst.m_rdata[j][i_dst] = initializeRealValue(m_policy_real[j]);
for (int j = 0; j < dst.m_num_runtime_real; ++j)
dst.m_runtime_rdata[j][i_dst] = initializeRealValue(m_policy_real[j+DstData::NAR]);
// initialize the int components
for (int j = 0; j < DstData::NAI; ++j)
dst.m_idata[j][i_dst] = initializeIntValue(m_policy_int[j]);
for (int j = 0; j < dst.m_num_runtime_int; ++j)
dst.m_runtime_idata[j][i_dst] = initializeIntValue(m_policy_int[j+DstData::NAI]);
// copy the shared real components
for (int j = 0; j < m_num_copy_real; ++j)
{
int src_comp, dst_comp;
amrex::ParticleReal* AMREX_RESTRICT dst_data;
const amrex::ParticleReal* AMREX_RESTRICT src_data;
if (m_src_comps_r[j] < SrcData::NAR)
{
// This is a compile-time attribute of the src
src_comp = m_src_comps_r[j];
src_data = src.m_rdata[src_comp];
}
else
{
// This is a runtime attribute of the src
src_comp = m_src_comps_r[j] - SrcData::NAR;
src_data = src.m_runtime_rdata[src_comp];
}
if (m_dst_comps_r[j] < DstData::NAR)
{
// This is a compile-time attribute of the dst
dst_comp = m_dst_comps_r[j];
dst_data = dst.m_rdata[dst_comp];
}
else
{
// This is a runtime attribute of the dst
dst_comp = m_dst_comps_r[j] - DstData::NAR;
dst_data = dst.m_runtime_rdata[dst_comp];
}
dst_data[i_dst] = src_data[i_src];
}
// copy the shared int components
for (int j = 0; j < m_num_copy_int; ++j)
{
int src_comp, dst_comp;
int* AMREX_RESTRICT dst_data;
int* AMREX_RESTRICT src_data;
if (m_src_comps_i[j] < SrcData::NAI)
{
src_comp = m_src_comps_i[j];
src_data = src.m_idata[src_comp];
}
else
{
src_comp = m_src_comps_i[j] - SrcData::NAI;
src_data = src.m_runtime_idata[src_comp];
}
if (m_dst_comps_i[j] < DstData::NAI)
{
dst_comp = m_dst_comps_i[j];
dst_data = dst.m_idata[dst_comp];
}
else
{
dst_comp = m_dst_comps_i[j] - DstData::NAI;
dst_data = dst.m_runtime_idata[dst_comp];
}
dst_data[i_dst] = src_data[i_src];
}
}
};
/**
* \brief A factory for creating SmartCopy functors.
*
* Given two particle containers, this can create a functor
* that will perform the smart copy operation between those
* particle container's tiles.
*/
class SmartCopyFactory
{
SmartCopyTag m_tag_real;
SmartCopyTag m_tag_int;
PolicyVec m_policy_real;
PolicyVec m_policy_int;
bool m_defined;
public:
template <class SrcPC, class DstPC>
SmartCopyFactory (const SrcPC& src, const DstPC& dst) noexcept
: m_defined(false)
{
m_tag_real = getSmartCopyTag(src.getParticleComps(), dst.getParticleComps());
m_tag_int = getSmartCopyTag(src.getParticleiComps(), dst.getParticleiComps());
m_policy_real = getPolicies(dst.getParticleComps());
m_policy_int = getPolicies(dst.getParticleiComps());
m_defined = true;
}
SmartCopy getSmartCopy () const noexcept
{
AMREX_ASSERT(m_defined);
return SmartCopy{m_tag_real.size(),
m_tag_real.src_comps.dataPtr(),
m_tag_real.dst_comps.dataPtr(),
m_tag_int.size(),
m_tag_int. src_comps.dataPtr(),
m_tag_int. dst_comps.dataPtr(),
m_policy_real.dataPtr(),
m_policy_int.dataPtr()};
}
bool isDefined () const noexcept { return m_defined; }
};
#endif
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