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Belos::BlockGmresSolMgr< ScalarType, MV, OP > Class Template Reference

Interface to Block GMRES and Flexible GMRES. More...

#include <BelosBlockGmresSolMgr.hpp>

Inheritance diagram for Belos::BlockGmresSolMgr< ScalarType, MV, OP >:
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List of all members.

Public Member Functions

Constructors/Destructor
 BlockGmresSolMgr ()
 Empty constructor for BlockGmresSolMgr. This constructor takes no arguments and sets the default values for the solver. The linear problem must be passed in using setProblem() before solve() is called on this object. The solver values can be changed using setParameters().
 BlockGmresSolMgr (const Teuchos::RCP< LinearProblem< ScalarType, MV, OP > > &problem, const Teuchos::RCP< Teuchos::ParameterList > &pl)
 Basic constructor for BlockGmresSolMgr.
virtual ~BlockGmresSolMgr ()
 Destructor.
Accessor methods
const LinearProblem
< ScalarType, MV, OP > & 
getProblem () const
 Get current linear problem being solved for in this object.
Teuchos::RCP< const
Teuchos::ParameterList
getValidParameters () const
 Get a parameter list containing the valid parameters for this object.
Teuchos::RCP< const
Teuchos::ParameterList
getCurrentParameters () const
 Get a parameter list containing the current parameters for this object.
Teuchos::Array< Teuchos::RCP
< Teuchos::Time > > 
getTimers () const
 Return the timers for this object.
MagnitudeType achievedTol () const
 Tolerance achieved by the last solve() invocation.
int getNumIters () const
 Get the iteration count for the most recent call to solve().
bool isLOADetected () const
 Return whether a loss of accuracy was detected by this solver during the most current solve.
Set methods
void setProblem (const Teuchos::RCP< LinearProblem< ScalarType, MV, OP > > &problem)
 Set the linear problem that needs to be solved.
void setParameters (const Teuchos::RCP< Teuchos::ParameterList > &params)
 Set the parameters the solver manager should use to solve the linear problem.
Reset methods
void reset (const ResetType type)
 Performs a reset of the solver manager specified by the ResetType. This informs the solver manager that the solver should prepare for the next call to solve by resetting certain elements of the iterative solver strategy.
Solver application methods
ReturnType solve ()
 This method performs possibly repeated calls to the underlying linear solver's iterate() routine until the problem has been solved (as decided by the solver manager) or the solver manager decides to quit.
Overridden from Teuchos::Describable
std::string description () const
 Method to return description of the block GMRES solver manager.

Detailed Description

template<class ScalarType, class MV, class OP>
class Belos::BlockGmresSolMgr< ScalarType, MV, OP >

Interface to Block GMRES and Flexible GMRES.

Author:
Heidi Thornquist, Chris Baker, and Teri Barth

This class provides an interface to Block GMRES, for solving linear systems with one or more right-hand sides. Our Block GMRES implementation also has an option (the Boolean "Flexible Gmres" parameter) to use the Flexible variant of GMRES. Flexible GMRES allows the preconditioner (which must be a right preconditioner) to change from iteration to iteration.

If you are a new Belos user and just want standard GMRES, use PseudoBlockGmresSolMgr. If you want Flexible GMRES, use this class with the "Flexible Gmres" parameter set to true.

Examples:

BlockGmres/BlockFlexGmresEpetraExFile.cpp, BlockGmres/BlockGmresEpetraExFile.cpp, and BlockGmres/BlockPrecGmresEpetraExFile.cpp.

Definition at line 125 of file BelosBlockGmresSolMgr.hpp.


Constructor & Destructor Documentation

template<class ScalarType , class MV , class OP >
Belos::BlockGmresSolMgr< ScalarType, MV, OP >::BlockGmresSolMgr ( )

Empty constructor for BlockGmresSolMgr. This constructor takes no arguments and sets the default values for the solver. The linear problem must be passed in using setProblem() before solve() is called on this object. The solver values can be changed using setParameters().

Definition at line 392 of file BelosBlockGmresSolMgr.hpp.

template<class ScalarType , class MV , class OP >
Belos::BlockGmresSolMgr< ScalarType, MV, OP >::BlockGmresSolMgr ( const Teuchos::RCP< LinearProblem< ScalarType, MV, OP > > &  problem,
const Teuchos::RCP< Teuchos::ParameterList > &  pl 
)

Basic constructor for BlockGmresSolMgr.

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

  • "Block Size" - a int specifying the block size to be used by the underlying block GMRES solver. Default: 1
  • "Adaptive Block Size" - a bool specifying whether the block size can be modified throughout the solve. Default: true
  • "Num Blocks" - a int specifying the number of blocks allocated for the Krylov basis. Default: 300
  • "Maximum Iterations" - a int specifying the maximum number of iterations the underlying solver is allowed to perform. Default: 1000
  • "Maximum Restarts" - a int specifying the maximum number of restarts the underlying solver is allowed to perform. Default: 20
  • "Orthogonalization" - a std::string specifying the desired orthogonalization: DGKS, ICGS, and IMGS. Default: "DGKS"
  • "Verbosity" - a sum of MsgType specifying the verbosity. Default: Belos::Errors
  • "Output Style" - a OutputType specifying the style of output. Default: Belos::General
  • "Convergence Tolerance" - a MagnitudeType specifying the level that residual norms must reach to decide convergence. Default: 1e-8

Definition at line 422 of file BelosBlockGmresSolMgr.hpp.

template<class ScalarType , class MV , class OP >
virtual Belos::BlockGmresSolMgr< ScalarType, MV, OP >::~BlockGmresSolMgr ( ) [inline, virtual]

Destructor.

Definition at line 164 of file BelosBlockGmresSolMgr.hpp.


Member Function Documentation

template<class ScalarType , class MV , class OP >
const LinearProblem<ScalarType,MV,OP>& Belos::BlockGmresSolMgr< ScalarType, MV, OP >::getProblem ( ) const [inline, virtual]

Get current linear problem being solved for in this object.

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

Definition at line 172 of file BelosBlockGmresSolMgr.hpp.

template<class ScalarType , class MV , class OP >
Teuchos::RCP< const Teuchos::ParameterList > Belos::BlockGmresSolMgr< ScalarType, MV, OP >::getValidParameters ( ) const [virtual]

Get a parameter list containing the valid parameters for this object.

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

Definition at line 462 of file BelosBlockGmresSolMgr.hpp.

template<class ScalarType , class MV , class OP >
Teuchos::RCP<const Teuchos::ParameterList> Belos::BlockGmresSolMgr< ScalarType, MV, OP >::getCurrentParameters ( ) const [inline, virtual]

Get a parameter list containing the current parameters for this object.

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

Definition at line 182 of file BelosBlockGmresSolMgr.hpp.

template<class ScalarType , class MV , class OP >
Teuchos::Array<Teuchos::RCP<Teuchos::Time> > Belos::BlockGmresSolMgr< ScalarType, MV, OP >::getTimers ( ) const [inline]

Return the timers for this object.

The timers are ordered as follows:

Definition at line 189 of file BelosBlockGmresSolMgr.hpp.

template<class ScalarType , class MV , class OP >
MagnitudeType Belos::BlockGmresSolMgr< ScalarType, MV, OP >::achievedTol ( ) const [inline, virtual]

Tolerance achieved by the last solve() invocation.

This is the maximum over all right-hand sides' achieved convergence tolerances, and is set whether or not the solve actually managed to achieve the desired convergence tolerance.

Warning:
This result may not be meaningful if there was a loss of accuracy during the solve. You should first call isLOADetected() to check for a loss of accuracy during the last solve.

Reimplemented from Belos::SolverManager< ScalarType, MV, OP >.

Definition at line 203 of file BelosBlockGmresSolMgr.hpp.

template<class ScalarType , class MV , class OP >
int Belos::BlockGmresSolMgr< ScalarType, MV, OP >::getNumIters ( ) const [inline, virtual]

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

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

Definition at line 208 of file BelosBlockGmresSolMgr.hpp.

template<class ScalarType , class MV , class OP >
bool Belos::BlockGmresSolMgr< ScalarType, MV, OP >::isLOADetected ( ) const [inline, virtual]

Return whether a loss of accuracy was detected by this solver during the most current solve.

Note:
This flag will be reset the next time solve() is called.

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

Definition at line 215 of file BelosBlockGmresSolMgr.hpp.

template<class ScalarType , class MV , class OP >
void Belos::BlockGmresSolMgr< ScalarType, MV, OP >::setProblem ( const Teuchos::RCP< LinearProblem< ScalarType, MV, OP > > &  problem) [inline, virtual]

Set the linear problem that needs to be solved.

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

Definition at line 223 of file BelosBlockGmresSolMgr.hpp.

template<class ScalarType , class MV , class OP >
void Belos::BlockGmresSolMgr< ScalarType, MV, OP >::setParameters ( const Teuchos::RCP< Teuchos::ParameterList > &  params) [virtual]

Set the parameters the solver manager should use to solve the linear problem.

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

Definition at line 525 of file BelosBlockGmresSolMgr.hpp.

template<class ScalarType , class MV , class OP >
void Belos::BlockGmresSolMgr< ScalarType, MV, OP >::reset ( const ResetType  type) [inline, virtual]

Performs a reset of the solver manager specified by the ResetType. This informs the solver manager that the solver should prepare for the next call to solve by resetting certain elements of the iterative solver strategy.

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

Definition at line 236 of file BelosBlockGmresSolMgr.hpp.

template<class ScalarType , class MV , class OP >
ReturnType Belos::BlockGmresSolMgr< ScalarType, MV, OP >::solve ( ) [virtual]

This method performs possibly repeated calls to the underlying linear solver'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 BlockGmresIter::iterate(), which will return either because a specially constructed status test evaluates to Passed or an std::exception is thrown.

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

  • the maximum number of restarts has been exceeded. In this scenario, the current solutions to the linear system will be placed in the linear problem and return Unconverged.
  • global convergence has been met. In this case, the current solutions to the linear system will be placed in the linear problem and the solver manager will return Converged
Returns:
ReturnType specifying:
  • Converged: the linear problem was solved to the specification required by the solver manager.
  • Unconverged: the linear problem was not solved to the specification desired by the solver manager.

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

Definition at line 902 of file BelosBlockGmresSolMgr.hpp.

template<class ScalarType , class MV , class OP >
std::string Belos::BlockGmresSolMgr< ScalarType, MV, OP >::description ( ) const [virtual]

Method to return description of the block GMRES solver manager.

Reimplemented from Teuchos::Describable.

Definition at line 1296 of file BelosBlockGmresSolMgr.hpp.


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