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/* Copyright 2021 Axel Huebl, Remi Lehe
*
* This file is part of WarpX.
*
* License: BSD-3-Clause-LBNL
*/
#ifndef ABLASTR_PARTICLE_MOMENTS_H
#define ABLASTR_PARTICLE_MOMENTS_H
#include <AMReX_ParallelDescriptor.H>
#include <AMReX_ParticleReduce.H>
#include <AMReX_REAL.H>
#include <AMReX_Reduce.H>
#include <AMReX_Tuple.H>
#include <tuple>
#include <vector>
namespace ablastr {
namespace particles {
/** Compute the min and max of the particle position in each dimension
*
* \tparam T_PC a type of amrex::ParticleContainer
*
* \param pc the particle container to operate on
* \returns x_min, y_min, z_min, x_max, y_max, z_max
*/
template< typename T_PC >
static
std::tuple<
amrex::ParticleReal, amrex::ParticleReal,
amrex::ParticleReal, amrex::ParticleReal,
amrex::ParticleReal, amrex::ParticleReal>
MinAndMaxPositions (T_PC const & pc)
{
using PType = typename T_PC::SuperParticleType;
// Get min and max for the local rank
amrex::ReduceOps<
amrex::ReduceOpMin, amrex::ReduceOpMin, amrex::ReduceOpMin,
amrex::ReduceOpMax, amrex::ReduceOpMax, amrex::ReduceOpMax> reduce_ops;
auto r = amrex::ParticleReduce<
amrex::ReduceData<amrex::ParticleReal, amrex::ParticleReal, amrex::ParticleReal,
amrex::ParticleReal, amrex::ParticleReal, amrex::ParticleReal>
>(
pc,
[=] AMREX_GPU_DEVICE(PType const & p) noexcept
{
amrex::ParticleReal const x = p.pos(0);
amrex::ParticleReal const y = p.pos(1);
amrex::ParticleReal const z = p.pos(2);
return amrex::makeTuple(x, y, z, x, y, z);
},
reduce_ops
);
// Get min and max across all ranks
std::vector< amrex::ParticleReal > xyz_min = {
amrex::get<0>(r),
amrex::get<1>(r),
amrex::get<2>(r)
};
amrex::ParallelDescriptor::ReduceRealMin(xyz_min.data(), xyz_min.size());
std::vector< amrex::ParticleReal > xyz_max = {
amrex::get<3>(r),
amrex::get<4>(r),
amrex::get<5>(r)
};
amrex::ParallelDescriptor::ReduceRealMax(xyz_max.data(), xyz_max.size());
return {xyz_min[0], xyz_min[1], xyz_min[2], xyz_max[0], xyz_max[1], xyz_max[2]};
}
/** Compute the mean and std of the particle position in each dimension
*
* \tparam T_PC a type of amrex::ParticleContainer
* \tparam T_RealSoAWeight
*
* \param pc the particle container to operate on
* \returns x_mean, x_std, y_mean, y_std, z_mean, z_std
*/
template< typename T_PC, int T_RealSoAWeight >
static
std::tuple<
amrex::ParticleReal, amrex::ParticleReal,
amrex::ParticleReal, amrex::ParticleReal,
amrex::ParticleReal, amrex::ParticleReal>
MeanAndStdPositions (T_PC const & pc)
{
using PType = typename T_PC::SuperParticleType;
amrex::ReduceOps<
amrex::ReduceOpSum, amrex::ReduceOpSum, amrex::ReduceOpSum,
amrex::ReduceOpSum, amrex::ReduceOpSum, amrex::ReduceOpSum,
amrex::ReduceOpSum> reduce_ops;
auto r = amrex::ParticleReduce<
amrex::ReduceData<
amrex::ParticleReal, amrex::ParticleReal, amrex::ParticleReal,
amrex::ParticleReal, amrex::ParticleReal, amrex::ParticleReal,
amrex::ParticleReal>
>(
pc,
[=] AMREX_GPU_DEVICE(const PType& p) noexcept
{
amrex::ParticleReal const x = p.pos(0);
amrex::ParticleReal const y = p.pos(1);
amrex::ParticleReal const z = p.pos(2);
amrex::ParticleReal const w = p.rdata(T_RealSoAWeight);
return amrex::makeTuple(x, x*x, y, y*y, z, z*z, w);
},
reduce_ops
);
// Reduce across MPI ranks
std::vector<amrex::ParticleReal> data_vector = {
amrex::get<0>(r),
amrex::get<1>(r),
amrex::get<2>(r),
amrex::get<3>(r),
amrex::get<4>(r),
amrex::get<5>(r),
amrex::get<6>(r)
};
amrex::ParallelDescriptor::ReduceRealSum(data_vector.data(), data_vector.size());
amrex::ParticleReal w_sum = data_vector[6];
amrex::ParticleReal x_mean = data_vector[0] / w_sum;
amrex::ParticleReal x_std = data_vector[1] / w_sum- x_mean * x_mean;
amrex::ParticleReal y_mean = data_vector[2] / w_sum;
amrex::ParticleReal y_std = data_vector[3] / w_sum- x_mean * x_mean;
amrex::ParticleReal z_mean = data_vector[4] / w_sum;
amrex::ParticleReal z_std = data_vector[5] / w_sum- x_mean * x_mean;
return {x_mean, x_std, y_mean, y_std, z_mean, z_std};
}
} // namespace particles
} // namespace ablastr
#endif // ABLASTR_PARTICLE_MOMENTS_H
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