PArpackSolver< VectorType > Class Template Reference

#include <deal.II/lac/parpack_solver.h>

Inheritance diagram for PArpackSolver< VectorType >:

Classes
struct	AdditionalData

Public Types
enum	WhichEigenvalues {   algebraically_largest, algebraically_smallest, largest_magnitude, smallest_magnitude,   largest_real_part, smallest_real_part, largest_imaginary_part, smallest_imaginary_part,   both_ends }
using	size_type = types::global_dof_index

Public Member Functions
SolverControl &	control () const
	PArpackSolver (SolverControl &control, const MPI_Comm &mpi_communicator, const AdditionalData &data=AdditionalData())
void	reinit (const IndexSet &locally_owned_dofs)
void	reinit (const IndexSet &locally_owned_dofs, const std::vector< IndexSet > &partitioning)
void	reinit (const VectorType &distributed_vector)
void	set_initial_vector (const VectorType &vec)
void	set_shift (const std::complex< double > sigma)
template<typename MatrixType1 , typename MatrixType2 , typename INVERSE >
void	solve (const MatrixType1 &A, const MatrixType2 &B, const INVERSE &inverse, std::vector< std::complex< double >> &eigenvalues, std::vector< VectorType > &eigenvectors, const unsigned int n_eigenvalues)
template<typename MatrixType1 , typename MatrixType2 , typename INVERSE >
void	solve (const MatrixType1 &A, const MatrixType2 &B, const INVERSE &inverse, std::vector< std::complex< double >> &eigenvalues, std::vector< VectorType * > &eigenvectors, const unsigned int n_eigenvalues)
std::size_t	memory_consumption () const
Public Member Functions inherited from Subscriptor
	Subscriptor ()
	Subscriptor (const Subscriptor &)
	Subscriptor (Subscriptor &&) noexcept
virtual	~Subscriptor ()
Subscriptor &	operator= (const Subscriptor &)
Subscriptor &	operator= (Subscriptor &&) noexcept
void	subscribe (std::atomic< bool > *const validity, const std::string &identifier="") const
void	unsubscribe (std::atomic< bool > *const validity, const std::string &identifier="") const
unsigned int	n_subscriptions () const
template<typename StreamType >
void	list_subscribers (StreamType &stream) const
void	list_subscribers () const
template<class Archive >
void	serialize (Archive &ar, const unsigned int version)

Protected Attributes
SolverControl &	solver_control
const AdditionalData	additional_data
MPI_Comm	mpi_communicator
MPI_Fint	mpi_communicator_fortran
int	lworkl
std::vector< double >	workl
std::vector< double >	workd
int	nloc
int	ncv
int	ldv
std::vector< double >	v
bool	initial_vector_provided
std::vector< double >	resid
int	ldz
std::vector< double >	z
int	lworkev
std::vector< double >	workev
std::vector< int >	select
VectorType	src
VectorType	dst
VectorType	tmp
std::vector< types::global_dof_index >	local_indices
double	sigmar
double	sigmai

Private Member Functions
void	internal_reinit (const IndexSet &locally_owned_dofs)

Static Private Member Functions
static ::ExceptionBase &	PArpackExcConvergedEigenvectors (int arg1, int arg2)
static ::ExceptionBase &	PArpackExcInvalidNumberofEigenvalues (int arg1, int arg2)
static ::ExceptionBase &	PArpackExcInvalidEigenvectorSize (int arg1, int arg2)
static ::ExceptionBase &	PArpackExcInvalidEigenvectorSizeNonsymmetric (int arg1, int arg2)
static ::ExceptionBase &	PArpackExcInvalidEigenvalueSize (int arg1, int arg2)
static ::ExceptionBase &	PArpackExcInvalidNumberofArnoldiVectors (int arg1, int arg2)
static ::ExceptionBase &	PArpackExcSmallNumberofArnoldiVectors (int arg1, int arg2)
static ::ExceptionBase &	PArpackExcIdo (int arg1)
static ::ExceptionBase &	PArpackExcMode (int arg1)
static ::ExceptionBase &	PArpackExcInfoPdnaupd (int arg1)
static ::ExceptionBase &	PArpackExcInfoPdneupd (int arg1)
static ::ExceptionBase &	PArpackExcInfoMaxIt (int arg1)
static ::ExceptionBase &	PArpackExcNoShifts (int arg1)

Additional Inherited Members
Static Public Member Functions inherited from Subscriptor
static ::ExceptionBase &	ExcInUse (int arg1, std::string arg2, std::string arg3)
static ::ExceptionBase &	ExcNoSubscriber (std::string arg1, std::string arg2)

Detailed Description

template<typename VectorType>
class PArpackSolver< VectorType >

Interface for using PARPACK. PARPACK is a collection of Fortran77 subroutines designed to solve large scale eigenvalue problems. Here we interface to the routines pdneupd, pdseupd, pdnaupd, pdsaupd of PARPACK. The package is designed to compute a few eigenvalues and corresponding eigenvectors of a general n by n matrix A. It is most appropriate for large sparse matrices A.

In this class we make use of the method applied to the generalized eigenspectrum problem \((A-\lambda B)x=0\), for \(x\neq0\); where \(A\) is a system matrix, \(B\) is a mass matrix, and \(\lambda, x\) are a set of eigenvalues and eigenvectors respectively.

The ArpackSolver can be used in application codes in the following way:

SolverControl solver_control (1000, 1e-9);
const unsigned int num_arnoldi_vectors = 2*size_of_spectrum + 2;
PArpackSolver<V>::AdditionalData
  additional_data(num_arnoldi_vectors,
                  ::PArpackSolver<V>::largest_magnitude,
                  true);
 
 PArpackSolver<V> eigensolver (solver_control,
                               mpi_communicator,
                               additional_data);
 eigensolver.set_shift(sigma);
 eigensolver.reinit(locally_owned_dofs);
 eigensolver.solve (A,
                    B,
                    OP,
                    lambda,
                    x,
                    size_of_spectrum);

for the generalized eigenvalue problem \(Ax=B\lambda x\), where the variable size_of_spectrum tells PARPACK the number of eigenvector/eigenvalue pairs to solve for. Here, lambda is a vector that will contain the eigenvalues computed, x a vector of objects of type V that will contain the eigenvectors computed.

Currently, only three modes of (P)Arpack are implemented. In mode 3 (default), OP is an inverse operation for the matrix A - sigma * B, where sigma is a shift value, set to zero by default. Whereas in mode 2, OP is an inverse of M. Finally, mode 1 corresponds to standard eigenvalue problem without spectral transformation \(Ax=\lambda x\). The mode can be specified via AdditionalData object. Note that for shift-and-invert (mode=3), the sought eigenpairs are those after the spectral transformation is applied.

The OP can be specified by using a LinearOperator:

const double shift = 5.0;
const auto op_A = linear_operator<vector_t>(A);
const auto op_B = linear_operator<vector_t>(B);
const auto op_shift = op_A - shift * op_B;
SolverControl solver_control_lin (1000, 1e-10,false,false);
 
SolverCG<vector_t> cg(solver_control_lin);
const auto op_shift_invert =
  inverse_operator(op_shift, cg, PreconditionIdentity ());

The class is intended to be used with MPI and can work on arbitrary vector and matrix distributed classes. Both symmetric and non-symmetric A are supported.

For further information on how the PARPACK routines pdneupd, pdseupd, pdnaupd, pdsaupd work and also how to set the parameters appropriately please take a look into the PARPACK manual.

Author

Denis Davydov, 2015, 2017

Definition at line 213 of file parpack_solver.h.

Member Typedef Documentation

size_type

template<typename VectorType >

using PArpackSolver< VectorType >::size_type = types::global_dof_index

Declare the type for container size.

Definition at line 219 of file parpack_solver.h.

Member Enumeration Documentation

WhichEigenvalues

template<typename VectorType >

enum PArpackSolver::WhichEigenvalues

An enum that lists the possible choices for which eigenvalues to compute in the solve() function. Note, that this corresponds to the problem after shift-and-invert (the only currently supported spectral transformation) is applied.

A particular choice is limited based on symmetric or non-symmetric matrix A considered.

Enumerator
algebraically_largest	The algebraically largest eigenvalues.
algebraically_smallest	The algebraically smallest eigenvalues.
largest_magnitude	The eigenvalue with the largest magnitudes.
smallest_magnitude	The eigenvalue with the smallest magnitudes.
largest_real_part	The eigenvalues with the largest real parts.
smallest_real_part	The eigenvalues with the smallest real parts.
largest_imaginary_part	The eigenvalues with the largest imaginary parts.
smallest_imaginary_part	The eigenvalues with the smallest imaginary parts.
both_ends	Compute half of the eigenvalues from the high end of the spectrum and the other half from the low end. If the number of requested eigenvectors is odd, then the extra eigenvector comes from the high end of the spectrum.

Definition at line 230 of file parpack_solver.h.

Constructor & Destructor Documentation

PArpackSolver()

template<typename VectorType >

PArpackSolver< VectorType >::PArpackSolver	(	SolverControl &	control,
		const MPI_Comm &	mpi_communicator,
		const AdditionalData &	data = AdditionalData()
	)

Constructor.

Definition at line 642 of file parpack_solver.h.

Member Function Documentation

control()

template<typename VectorType >

SolverControl & PArpackSolver< VectorType >::control

Access to the object that controls convergence.

Definition at line 1161 of file parpack_solver.h.

reinit() [1/3]

template<typename VectorType >

void PArpackSolver< VectorType >::reinit

(

const IndexSet &

locally_owned_dofs

)

Initialize internal variables.

Definition at line 728 of file parpack_solver.h.

reinit() [2/3]

template<typename VectorType >

void PArpackSolver< VectorType >::reinit	(	const IndexSet &	locally_owned_dofs,
		const std::vector< IndexSet > &	partitioning
	)

Initialize internal variables when working with BlockVectors. locally_owned_dofs is used to set the dimension of the problem, whereas partitioning is used for calling the reinit of the deal.II blockvectors used.

Definition at line 756 of file parpack_solver.h.

reinit() [3/3]

template<typename VectorType >

void PArpackSolver< VectorType >::reinit

(

const VectorType &

distributed_vector

)

Initialize internal variables from the input distributed_vector.

Definition at line 742 of file parpack_solver.h.

set_initial_vector()

template<typename VectorType >

void PArpackSolver< VectorType >::set_initial_vector

(

const VectorType &

vec

)

Set initial vector for building Krylov space.

Definition at line 674 of file parpack_solver.h.

set_shift()

template<typename VectorType >

void PArpackSolver< VectorType >::set_shift

(

const std::complex< double >

sigma

)

Set shift sigma for shift-and-invert spectral transformation.

If this function is not called, the shift is assumed to be zero.

Note

only relevant for mode=3 (see the general documentation of this class for a definition of what the different modes are).

Definition at line 664 of file parpack_solver.h.

solve() [1/2]

template<typename VectorType >

template<typename MatrixType1 , typename MatrixType2 , typename INVERSE >

void PArpackSolver< VectorType >::solve	(	const MatrixType1 &	A,
		const MatrixType2 &	B,
		const INVERSE &	inverse,
		std::vector< std::complex< double >> &	eigenvalues,
		std::vector< VectorType > &	eigenvectors,
		const unsigned int	n_eigenvalues
	)

Solve the generalized eigensprectrum problem \(A x=\lambda B x\) by calling the pd(n/s)eupd and pd(n/s)aupd functions of PARPACK.

In mode=3, inverse should correspond to \([A-\sigma B]^{-1}\), whereas in mode=2 it should represent \(B^{-1}\). For mode=1 both B and inverse are ignored.

Definition at line 772 of file parpack_solver.h.

solve() [2/2]

template<typename VectorType >

template<typename MatrixType1 , typename MatrixType2 , typename INVERSE >

void PArpackSolver< VectorType >::solve	(	const MatrixType1 &	A,
		const MatrixType2 &	B,
		const INVERSE &	inverse,
		std::vector< std::complex< double >> &	eigenvalues,
		std::vector< VectorType * > &	eigenvectors,
		const unsigned int	n_eigenvalues
	)

Same as above but takes eigenvectors as pointers.

Definition at line 790 of file parpack_solver.h.

memory_consumption()

template<typename VectorType >

std::size_t PArpackSolver< VectorType >::memory_consumption

Return the memory consumption of this class in bytes.

Definition at line 591 of file parpack_solver.h.

internal_reinit()

template<typename VectorType >

void PArpackSolver< VectorType >::internal_reinit ( const IndexSet &  locally_owned_dofs )

private

Initialize internal variables which depend on locally_owned_dofs.

This function is called inside the reinit() functions

Definition at line 688 of file parpack_solver.h.

Member Data Documentation

solver_control

template<typename VectorType >

SolverControl& PArpackSolver< VectorType >::solver_control

protected

Reference to the object that controls convergence of the iterative solver.

Definition at line 383 of file parpack_solver.h.

additional_data

template<typename VectorType >

const AdditionalData PArpackSolver< VectorType >::additional_data

protected

Store a copy of the flags for this particular solver.

Definition at line 388 of file parpack_solver.h.

mpi_communicator

template<typename VectorType >

MPI_Comm PArpackSolver< VectorType >::mpi_communicator

protected

C++ MPI communicator.

Definition at line 395 of file parpack_solver.h.

mpi_communicator_fortran

template<typename VectorType >

MPI_Fint PArpackSolver< VectorType >::mpi_communicator_fortran

protected

Fortran MPI communicator.

Definition at line 400 of file parpack_solver.h.

lworkl

template<typename VectorType >

int PArpackSolver< VectorType >::lworkl

protected

Length of the work array workl.

Definition at line 407 of file parpack_solver.h.

workl

template<typename VectorType >

std::vector<double> PArpackSolver< VectorType >::workl

protected

Double precision work array of length lworkl

Definition at line 412 of file parpack_solver.h.

workd

template<typename VectorType >

std::vector<double> PArpackSolver< VectorType >::workd

protected

Double precision work array of length 3*N

Definition at line 417 of file parpack_solver.h.

nloc

template<typename VectorType >

int PArpackSolver< VectorType >::nloc

protected

Number of local degrees of freedom.

Definition at line 422 of file parpack_solver.h.

ncv

template<typename VectorType >

int PArpackSolver< VectorType >::ncv

protected

Number of Arnoldi basis vectors specified in additional_data

Definition at line 427 of file parpack_solver.h.

ldv

template<typename VectorType >

int PArpackSolver< VectorType >::ldv

protected

The leading dimension of the array v

Definition at line 433 of file parpack_solver.h.

v

template<typename VectorType >

std::vector<double> PArpackSolver< VectorType >::v

protected

Double precision vector of size ldv by NCV. Will contains the final set of Arnoldi basis vectors.

Definition at line 439 of file parpack_solver.h.

initial_vector_provided

template<typename VectorType >

bool PArpackSolver< VectorType >::initial_vector_provided

protected

An auxiliary flag which is set to true when initial vector is provided.

Definition at line 444 of file parpack_solver.h.

resid

template<typename VectorType >

std::vector<double> PArpackSolver< VectorType >::resid

protected

The initial residual vector, possibly from a previous run. On output, it contains the final residual vector.

Definition at line 450 of file parpack_solver.h.

ldz

template<typename VectorType >

int PArpackSolver< VectorType >::ldz

protected

The leading dimension of the array Z equal to nloc.

Definition at line 455 of file parpack_solver.h.

z

template<typename VectorType >

std::vector<double> PArpackSolver< VectorType >::z

protected

A vector of minimum size of nloc by NEV+1. Z contains the B-orthonormal Ritz vectors of the eigensystem A*z = lambda*B*z corresponding to the Ritz value approximations.

Definition at line 462 of file parpack_solver.h.

lworkev

template<typename VectorType >

int PArpackSolver< VectorType >::lworkev

protected

The size of the workev array.

Definition at line 467 of file parpack_solver.h.

workev

template<typename VectorType >

std::vector<double> PArpackSolver< VectorType >::workev

protected

Double precision work array of dimension 3* NCV.

Definition at line 472 of file parpack_solver.h.

select

template<typename VectorType >

std::vector<int> PArpackSolver< VectorType >::select

protected

A vector of dimension NCV.

Definition at line 477 of file parpack_solver.h.

src

template<typename VectorType >

VectorType PArpackSolver< VectorType >::src

protected

Temporary vectors used between Arpack and deal.II

Definition at line 482 of file parpack_solver.h.

dst

template<typename VectorType >

VectorType PArpackSolver< VectorType >::dst

protected

Definition at line 482 of file parpack_solver.h.

tmp

template<typename VectorType >

VectorType PArpackSolver< VectorType >::tmp

protected

Definition at line 482 of file parpack_solver.h.

local_indices

template<typename VectorType >

std::vector<types::global_dof_index> PArpackSolver< VectorType >::local_indices

protected

Indices of local degrees of freedom.

Definition at line 487 of file parpack_solver.h.

sigmar

template<typename VectorType >

double PArpackSolver< VectorType >::sigmar

protected

Real part of the shift

Definition at line 492 of file parpack_solver.h.

sigmai

template<typename VectorType >

double PArpackSolver< VectorType >::sigmai

protected

Imaginary part of the shift

Definition at line 497 of file parpack_solver.h.

---

The documentation for this class was generated from the following file:

• include/deal.II/lac/parpack_solver.h