#include <p3m_heffte.impl.hpp>

Inheritance diagram for CoulombTuningAlgorithm< FloatType, Architecture, FFTConfig >:

Collaboration diagram for CoulombTuningAlgorithm< FloatType, Architecture, FFTConfig >:

Public Member Functions
	CoulombTuningAlgorithm (System::System &system, auto &input_p3m, double prefactor, int timings, decltype(m_tune_limits) tune_limits)

void	on_solver_change () const override

void	setup_logger (bool verbose) override

std::optional< std::string >	layer_correction_veto_r_cut (double r_cut) const override

std::optional< std::string >	fft_decomposition_veto (Utils::Vector3i const &mesh_size_r_space) const override

std::tuple< double, double, double, double >	calculate_accuracy (Utils::Vector3i const &mesh, int cao, double r_cut_iL) const override

void	determine_mesh_limits () override

TuningAlgorithm::Parameters	get_time () override

Public Member Functions inherited from TuningAlgorithm
	TuningAlgorithm (System::System &system, double prefactor, int timings)

virtual	~TuningAlgorithm ()=default

void	determine_r_cut_limits ()
	Determine a sensible range for the real-space cutoff.

void	determine_cao_limits (int initial_cao)
	Determine a sensible range for the charge assignment order.

void	commit (Utils::Vector3i const &mesh, int cao, double r_cut_iL, double alpha_L)
	Write tuned parameters to the P3M parameter struct.

void	tune ()

Protected Member Functions
P3MParameters &	get_params () override

constexpr std::tuple< int, int, int >	get_memory_layout () const

Protected Member Functions inherited from TuningAlgorithm
auto	get_n_trials ()

void	increment_n_trials ()

void	reset_n_trials ()

double	get_m_time (Utils::Vector3i const &mesh, int &tuned_cao, double &tuned_r_cut_iL, double &tuned_alpha_L, double &tuned_accuracy)
	Get the optimal alpha and the corresponding computation time for a fixed `mesh`.

double	get_mc_time (Utils::Vector3i const &mesh, int cao, double &tuned_r_cut_iL, double &tuned_alpha_L, double &tuned_accuracy)
	Get the optimal alpha and the corresponding computation time for a fixed `mesh` and `cao`.

Additional Inherited Members
Protected Attributes inherited from TuningAlgorithm
System::System &	m_system

double	m_prefactor

std::unique_ptr< TuningLogger >	m_logger = nullptr

int	cao_min = -1

int	cao_max = -1

int	cao_best = -1

double	m_r_cut_iL_min = -1.

double	m_r_cut_iL_max = -1.

Static Protected Attributes inherited from TuningAlgorithm
static auto constexpr	time_granularity = 5.
	Granularity of the time measurement (milliseconds).

static auto constexpr	max_n_consecutive_trials = 40
	Maximal number of consecutive trials that don't improve runtime.

static auto constexpr	time_sentinel = std::numeric_limits<double>::max()
	Value for invalid time measurements.

Detailed Description

template<typename FloatType, Arch Architecture, class FFTConfig>
class CoulombTuningAlgorithm< FloatType, Architecture, FFTConfig >

Definition at line 839 of file p3m_heffte.impl.hpp.

Constructor & Destructor Documentation

◆ CoulombTuningAlgorithm()

template<typename FloatType , Arch Architecture, class FFTConfig >

CoulombTuningAlgorithm< FloatType, Architecture, FFTConfig >::CoulombTuningAlgorithm	(	System::System &	system,
		auto &	input_p3m,
		double	prefactor,
		int	timings,
		decltype(m_tune_limits)	tune_limits
	)

inline

Definition at line 859 of file p3m_heffte.impl.hpp.

Member Function Documentation

◆ calculate_accuracy()

template<typename FloatType , Arch Architecture, class FFTConfig >

std::tuple< double, double, double, double > CoulombTuningAlgorithm< FloatType, Architecture, FFTConfig >::calculate_accuracy	(	Utils::Vector3i const &	mesh,
		int	cao,
		double	r_cut_iL
	)		const

inlineoverridevirtual

Implements TuningAlgorithm.

Definition at line 933 of file p3m_heffte.impl.hpp.

References P3MParameters::accuracy, comm_cart, CUDA, Utils::Vector< T, N >::data(), Utils::Vector< T, N >::norm(), p3m_k_space_error(), p3m_k_space_error_gpu(), p3m_real_space_error(), P3MStateCommon< FloatType >::params, stream, CoulombP3MState< FloatType, FFTConfig >::sum_q2, CoulombP3MState< FloatType, FFTConfig >::sum_qpart, and this_node.

◆ determine_mesh_limits()

template<typename FloatType , Arch Architecture, class FFTConfig >

void CoulombTuningAlgorithm< FloatType, Architecture, FFTConfig >::determine_mesh_limits ( )

inlineoverridevirtual

Implements TuningAlgorithm.

Definition at line 973 of file p3m_heffte.impl.hpp.

References Utils::Vector< T, N >::broadcast(), P3MParameters::mesh, P3MStateCommon< FloatType >::params, stream, and CoulombP3MState< FloatType, FFTConfig >::sum_qpart.

◆ fft_decomposition_veto()

template<typename FloatType , Arch Architecture, class FFTConfig >

std::optional< std::string > CoulombTuningAlgorithm< FloatType, Architecture, FFTConfig >::fft_decomposition_veto ( Utils::Vector3i const & mesh_size_r_space ) const