Dune Core Modules (2.9.0)
Nonoverlapping parallel preconditioner. More...
#include <dune/istl/novlpschwarz.hh>
Public Types  
typedef P::domain_type  domain_type 
The domain type of the preconditioner.  
typedef P::range_type  range_type 
The range type of the preconditioner.  
typedef C  communication_type 
The type of the communication object.  
typedef X::field_type  field_type 
The field type of the preconditioner.  
Public Member Functions  
NonoverlappingBlockPreconditioner (P &p, const communication_type &c)  
Constructor. More...  
NonoverlappingBlockPreconditioner (const std::shared_ptr< P > &p, const communication_type &c)  
Constructor. More...  
virtual void  pre (domain_type &x, range_type &b) 
Prepare the preconditioner. More...  
virtual void  apply (domain_type &v, const range_type &d) 
Apply the preconditioner. More...  
template<bool forward>  
void  apply (X &v, const Y &d) 
Apply one step of the preconditioner to the system A(v)=d. More...  
virtual void  post (domain_type &x) 
Clean up. More...  
virtual SolverCategory::Category  category () const 
Category of the preconditioner (see SolverCategory::Category)  
Detailed Description
template<class C, class P>
class Dune::NonoverlappingBlockPreconditioner< C, P >
Nonoverlapping parallel preconditioner.
This is essentially a wrapper that take a sequential preconditoner. In each step the sequential preconditioner is applied and then all owner data points are updated on all other processes.
Constructor & Destructor Documentation
◆ NonoverlappingBlockPreconditioner() [1/2]

inline 
Constructor.
constructor gets all parameters to operate the prec.
 Parameters

prec The sequential preconditioner. c The communication object for syncing owner and copy data points. (E.~g. OwnerOverlapCommunication )
Constructor.
constructor gets all parameters to operate the prec.
 Parameters

p The sequential preconditioner. c The communication object for syncing overlap and copy data points. (E.~g. OwnerOverlapCopyCommunication )
◆ NonoverlappingBlockPreconditioner() [2/2]

inline 
Constructor.
constructor gets all parameters to operate the prec.
 Parameters

p The sequential preconditioner. c The communication object for syncing overlap and copy data points. (E.~g. OwnerOverlapCopyCommunication )
Member Function Documentation
◆ apply() [1/2]

inlinevirtual 
Apply the preconditioner.
Apply one step of the preconditioner to the system A(v)=d. On entry v=0 and d=bA(x) (although this might not be computed in that way. On exit v contains the update, i.e one step computes \( v = M^{1} d \) where \( M \) is the approximate inverse of the operator \( A \) characterizing the preconditioner.
 Parameters

[out] v The update to be computed d The current defect.
Implements Dune::Preconditioner< P::domain_type, P::range_type >.
◆ apply() [2/2]

inlinevirtual 
Apply one step of the preconditioner to the system A(v)=d.
On entry v=0 and d=bA(x) (although this might not be computed in that way. On exit v contains the update, i.e one step computes \( v = M^{1} d \) where \( M \) is the approximate inverse of the operator \( A \) characterizing the preconditioner.
 Parameters

[out] v The update to be computed d The current defect.
Implements Dune::Preconditioner< P::domain_type, P::range_type >.
◆ post()

inlinevirtual 
Clean up.
Clean up. This method is called after the last apply call for the linear system to be solved. Memory may be deallocated safely here. x is the solution of the linear equation.
 Parameters

x The right hand side of the equation.
Implements Dune::Preconditioner< P::domain_type, P::range_type >.
◆ pre()

inlinevirtual 
Prepare the preconditioner.
Prepare the preconditioner. A solver solves a linear operator equation A(x)=b by applying one or several steps of the preconditioner. The method pre() is called before the first apply operation. b and x are right hand side and solution vector of the linear system respectively. It may. e.g., scale the system, allocate memory or compute a (I)LU decomposition. Note: The ILU decomposition could also be computed in the constructor or with a separate method of the derived method if several linear systems with the same matrix are to be solved.
 Note
 if a preconditioner is copied (e.g. for a second thread) again the pre() method has to be called to ensure proper memory mangement.
 Parameters

x The left hand side of the equation. b The right hand side of the equation.
Implements Dune::Preconditioner< P::domain_type, P::range_type >.
The documentation for this class was generated from the following file:
 dune/istl/novlpschwarz.hh