dune-pdelab
2.0.0
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Nonoverlapping parallel BiCGSTAB solver preconditioned by block SSOR. More...
#include <dune/pdelab/backend/novlpistlsolverbackend.hh>
Public Member Functions | |
ISTLBackend_NOVLP_BCGS_SSORk (const GO &grid_operator, unsigned maxiter_=5000, int steps_=5, int verbose_=1) | |
make a linear solver object More... | |
Vector::ElementType | norm (const Vector &v) const |
Compute global norm of a vector. More... | |
void | apply (M &A, V &z, W &r, typename V::ElementType reduction) |
Solve the given linear system. More... | |
const Dune::PDELab::LinearSolverResult < double > & | result () const |
Return access to result data. More... | |
Nonoverlapping parallel BiCGSTAB solver preconditioned by block SSOR.
GO | The type of the grid operator (or the fakeGOTraits class for the old grid operator space). |
The solver uses a NonoverlappingBlockPreconditioner with underlying sequential SSOR preconditioner. The crucial step is to add up the matrix entries corresponding to the border vertices on each process. This is achieved by performing a VertexExchanger::sumEntries(Matrix&) before constructing the sequential SSOR.
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inlineexplicit |
make a linear solver object
[in] | gfs_ | a grid function space |
[in] | maxiter_ | maximum number of iterations to do |
[in] | steps_ | number of SSOR steps to apply as inner iteration |
[in] | verbose_ | print messages if true |
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inlineinherited |
Solve the given linear system.
[in] | A | the given matrix |
[out] | z | the solution vector to be computed |
[in] | r | right hand side |
[in] | reduction | to be achieved |
References Dune::PDELab::LinearSolverResult< RFType >::conv_rate, Dune::PDELab::LinearSolverResult< RFType >::converged, Dune::PDELab::istl::ParallelHelper< GFS >::createIndexSetAndProjectForAMG(), Dune::PDELab::LinearSolverResult< RFType >::elapsed, Dune::PDELab::LinearSolverResult< RFType >::iterations, Dune::PDELab::istl::raw(), and Dune::PDELab::LinearSolverResult< RFType >::reduction.
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inlineinherited |
Compute global norm of a vector.
[in] | v | the given vector |
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inlineinherited |
Return access to result data.