Anasazi::BlockKrylovSchurSolMgr< ScalarType, MV, OP > Class Template Reference
[Anasazi Eigensolver Framework]

The Anasazi::BlockKrylovSchurSolMgr provides a flexible solver manager over the BlockKrylovSchur eigensolver. More...

#include <AnasaziBlockKrylovSchurSolMgr.hpp>

Inheritance diagram for Anasazi::BlockKrylovSchurSolMgr< ScalarType, MV, OP >:

List of all members.

Public Member Functions
Constructors/Destructor
	BlockKrylovSchurSolMgr (const Teuchos::RCP< Eigenproblem< ScalarType, MV, OP > > &problem, Teuchos::ParameterList &pl)
	Basic constructor for BlockKrylovSchurSolMgr.
virtual	~BlockKrylovSchurSolMgr ()
	Destructor.
Accessor methods
const Eigenproblem< ScalarType, MV, OP > &	getProblem () const
	Return the eigenvalue problem.
int	getNumIters () const
	Get the iteration count for the most recent call to solve().
std::vector< Value< ScalarType > >	getRitzValues () const
	Return the Ritz values from the most recent solve.
Teuchos::Array< Teuchos::RCP< Teuchos::Time > >	getTimers () const
	Return the timers for this object.
Solver application methods
ReturnType	solve ()
	This method performs possibly repeated calls to the underlying eigensolver's iterate() routine until the problem has been solved (as decided by the solver manager) or the solver manager decides to quit.
void	setGlobalStatusTest (const Teuchos::RCP< StatusTest< ScalarType, MV, OP > > &global)
	Set the status test defining global convergence.
const Teuchos::RCP< StatusTest< ScalarType, MV, OP > > &	getGlobalStatusTest () const
	Get the status test defining global convergence.
void	setDebugStatusTest (const Teuchos::RCP< StatusTest< ScalarType, MV, OP > > &debug)
	Set the status test for debugging.
const Teuchos::RCP< StatusTest< ScalarType, MV, OP > > &	getDebugStatusTest () const
	Get the status test for debugging.

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Detailed Description

template<class ScalarType, class MV, class OP>
class Anasazi::BlockKrylovSchurSolMgr< ScalarType, MV, OP >

The Anasazi::BlockKrylovSchurSolMgr provides a flexible solver manager over the BlockKrylovSchur eigensolver.

The solver manager provides to the solver a StatusTestCombo object constructed as follows:
   combo = globaltest OR debugtest
where

• globaltest terminates computation when global convergence has been detected.
  It is encapsulated in a StatusTestWithOrdering object, to ensure that computation is terminated only after the most significant eigenvalues/eigenvectors have met the convergence criteria.
  If not specified via setGlobalStatusTest(), this test is a StatusTestResNorm object which tests the 2-norms of the Ritz residuals relative to the Ritz values.
• debugtest allows a user to specify additional monitoring of the iteration, encapsulated in a StatusTest object
  If not specified via setDebugStatusTest(), debugtest is ignored.
  In most cases, it should return Failed; if it returns Passed, solve() will throw an AnasaziError exception.

Additionally, the solver manager will terminate solve() after a specified number of restarts.

Much of this behavior is controlled via parameters and options passed to the solver manager. For more information, see BlockKrylovSchurSolMgr().

Author:

Chris Baker, Ulrich Hetmaniuk, Rich Lehoucq, Heidi Thornquist

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Constructor & Destructor Documentation

template<class ScalarType, class MV, class OP>

Anasazi::BlockKrylovSchurSolMgr< ScalarType, MV, OP >::BlockKrylovSchurSolMgr	(	const Teuchos::RCP< Eigenproblem< ScalarType, MV, OP > > &	problem,
		Teuchos::ParameterList &	pl
	)

Basic constructor for BlockKrylovSchurSolMgr.

This constructor accepts the Eigenproblem to be solved in addition to a parameter list of options for the solver manager. These options include the following:

• Solver parameters
  • "Which" - a string specifying the desired eigenvalues: SM, LM, SR or LR. Default: "LM"
  • "Block Size" - a int specifying the block size to be used by the underlying block Krylov-Schur solver. Default: 1
  • "Num Blocks" - a int specifying the number of blocks allocated for the Krylov basis. Default: 3*nev
  • "Extra NEV Blocks" - a int specifying the number of extra blocks the solver should keep in addition to those required to compute the number of eigenvalues requested. Default: 0
  • "Maximum Restarts" - a int specifying the maximum number of restarts the underlying solver is allowed to perform. Default: 20
  • "Orthogonalization" - a string specifying the desired orthogonalization: DGKS and SVQB. Default: "SVQB"
  • "Verbosity" - a sum of MsgType specifying the verbosity. Default: Anasazi::Errors
• Convergence parameters
  • "Convergence Tolerance" - a MagnitudeType specifying the level that residual norms must reach to decide convergence. Default: machine precision.
  • "Relative Convergence Tolerance" - a bool specifying whether residuals norms should be scaled by their eigenvalues for the purposing of deciding convergence. Default: true

template<class ScalarType, class MV, class OP>

virtual Anasazi::BlockKrylovSchurSolMgr< ScalarType, MV, OP >::~BlockKrylovSchurSolMgr

(

)

[inline, virtual]

Destructor.

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Member Function Documentation

template<class ScalarType, class MV, class OP>

const Eigenproblem<ScalarType,MV,OP>& Anasazi::BlockKrylovSchurSolMgr< ScalarType, MV, OP >::getProblem

(

)

const [inline, virtual]

Return the eigenvalue problem.

Implements Anasazi::SolverManager< ScalarType, MV, OP >.

template<class ScalarType, class MV, class OP>

int Anasazi::BlockKrylovSchurSolMgr< ScalarType, MV, OP >::getNumIters

(

)

const [inline, virtual]

Get the iteration count for the most recent call to solve().

Implements Anasazi::SolverManager< ScalarType, MV, OP >.

template<class ScalarType, class MV, class OP>

std::vector<Value<ScalarType> > Anasazi::BlockKrylovSchurSolMgr< ScalarType, MV, OP >::getRitzValues

(

)

const [inline]

Return the Ritz values from the most recent solve.

template<class ScalarType, class MV, class OP>

Teuchos::Array<Teuchos::RCP<Teuchos::Time> > Anasazi::BlockKrylovSchurSolMgr< ScalarType, MV, OP >::getTimers

(

)

const [inline]

Return the timers for this object.

The timers are ordered as follows:

• time spent in solve() routine
• time spent restarting

template<class ScalarType, class MV, class OP>

ReturnType Anasazi::BlockKrylovSchurSolMgr< ScalarType, MV, OP >::solve

(

)

[virtual]

This method performs possibly repeated calls to the underlying eigensolver's iterate() routine until the problem has been solved (as decided by the solver manager) or the solver manager decides to quit.

This method calls BlockKrylovSchur::iterate(), which will return either because a specially constructed status test evaluates to Passed or an exception is thrown.

A return from BlockKrylovSchur::iterate() signifies one of the following scenarios:

• the maximum number of restarts has been exceeded. In this scenario, the solver manager will place
  all converged eigenpairs into the eigenproblem and return Unconverged.
• global convergence has been met. In this case, the most significant NEV eigenpairs in the solver and locked storage
  have met the convergence criterion. (Here, NEV refers to the number of eigenpairs requested by the Eigenproblem.)
  In this scenario, the solver manager will return Converged.

Returns:

ReturnType specifying:

• Converged: the eigenproblem was solved to the specification required by the solver manager.
• Unconverged: the eigenproblem was not solved to the specification desired by the solver manager.

Implements Anasazi::SolverManager< ScalarType, MV, OP >.

template<class ScalarType, class MV, class OP>

void Anasazi::BlockKrylovSchurSolMgr< ScalarType, MV, OP >::setGlobalStatusTest

(

const Teuchos::RCP< StatusTest< ScalarType, MV, OP > > &

global

)

Set the status test defining global convergence.

template<class ScalarType, class MV, class OP>

const Teuchos::RCP< StatusTest< ScalarType, MV, OP > > & Anasazi::BlockKrylovSchurSolMgr< ScalarType, MV, OP >::getGlobalStatusTest

(

)

const

Get the status test defining global convergence.

template<class ScalarType, class MV, class OP>

void Anasazi::BlockKrylovSchurSolMgr< ScalarType, MV, OP >::setDebugStatusTest

(

const Teuchos::RCP< StatusTest< ScalarType, MV, OP > > &

debug

)

Set the status test for debugging.

template<class ScalarType, class MV, class OP>

const Teuchos::RCP< StatusTest< ScalarType, MV, OP > > & Anasazi::BlockKrylovSchurSolMgr< ScalarType, MV, OP >::getDebugStatusTest

(

)

const

Get the status test for debugging.

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

• AnasaziBlockKrylovSchurSolMgr.hpp

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