Stratimikos: Thyra-based strategies for linear solvers

Stratimikos 1.0 in Trilinos 7.0

The package Stratimikos contains a unified set of Thyra-based wrappers to linear solver and preconditioner capabilities in Trilinos. The name Stratimikos was created from the Greek words "stratigiki" and "grammikos" which which mean "strategy" and "linear in English. The word "stratimikos" itself has no real meaning itself. The Stratimikos package is also a place where unified testing of linear solvers and preconditioners can be performed.

Stratimikos software

• Thyra::DefaultRealLinearSolverBuilder: A utility class that provides uniform access to linear solver capabilities in Trilinos where the underlying operator can be viewed as either an Epetra_CrsMatrix object or as an Epetra_RowMatrix object. This class builds linear solvers using the Thyra linear solver and preconditioner factory adapters given below.

Linear solver adapters

These adapters provide concrete subclasses implementing the abstract interfaces Thyra::LinearOpWithSolveFactoryBase and Thyra::LinearOpWithSolveBase. It is these implementations that are used in the implementation of Thyra::DefaultRealLinearSolverBuilder but they can also be used on their own.

• Thyra::AmesosLinearOpWithSolveFactory : Amesos/Thyra adatpers. Must be enabled with --enable-amesos.

• Thyra::AztecOOLinearOpWithSolveFactory : AztecOO/Thyra adatpers. Must be enabled with --enable-aztecoo.

• Thyra::BelosLinearOpWithSolveFactory : Belos/Thyra adatpers. Must be enabled with --enable-belos.

Preconditioner adapters

These adapters provide concrete subclasses implementing the abstract interface Thyra::PreconditionerFactoryBase. It is these implementations that are used in the implementation of Thyra::DefaultRealLinearSolverBuilder but can also be used on their own.

• Thyra::IfpackPreconditionerFactory : Ifpack/Thyra adatpers. Must be enabled with --enable-ifpack.

• Thyra::MLPreconditionerFactory : ML/Thyra adatpers. Must be enabled with --enable-ifpack.

Stratimikos examples

• simple_stratimikos_example.cpp: Shows how to use the Thyra::DefaultRealLinearSolverBuilder to solve linear systems based on Epetra objects.

Stratimikos browser

You can browse all of Stratimikos as a single doxygen collection. Warning, this is not the recommended way to learn about Stratimikos software. However, this is a good way to browse the directory structure of stratimikos, to locate files, etc.

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