Reference documentation for deal.II version 9.4.0
CUDAWrappers::PreconditionIC< Number > Class Template Reference

#include <deal.II/lac/cuda_precondition.h>

## Public Types

using size_type = int

## Public Member Functions

PreconditionIC (const Utilities::CUDA::Handle &handle)

PreconditionIC (const PreconditionIC< Number > &)=delete

PreconditionICoperator= (const PreconditionIC< Number > &)=delete

~PreconditionIC ()

void vmult (LinearAlgebra::CUDAWrappers::Vector< Number > &dst, const LinearAlgebra::CUDAWrappers::Vector< Number > &src) const

void Tvmult (LinearAlgebra::CUDAWrappers::Vector< Number > &dst, const LinearAlgebra::CUDAWrappers::Vector< Number > &src) const

size_type m () const

size_type n () const

## Private Attributes

cusparseHandle_t cusparse_handle

cusparseMatDescr_t descr_M

cusparseMatDescr_t descr_L

csric02Info_t info_M

csrsv2Info_t info_L

csrsv2Info_t info_Lt

SmartPointer< const SparseMatrix< Number > > matrix_pointer

std::unique_ptr< Number[], void(*)(Number *)> P_val_dev

const intP_row_ptr_dev

const intP_column_index_dev

std::unique_ptr< Number[], void(*)(Number *)> tmp_dev

std::unique_ptr< void, void(*)(void *)> buffer_dev

cusparseSolvePolicy_t policy_L

cusparseSolvePolicy_t policy_Lt

cusparseSolvePolicy_t policy_M

int n_rows

int n_nonzero_elements

## Detailed Description

template<typename Number>
class CUDAWrappers::PreconditionIC< Number >

This class implements an incomplete Cholesky factorization (IC) preconditioner for symmetric CUDAWrappers::SparseMatrix matrices.

The implementation closely follows the one documented in the cuSPARSE documentation (https://docs.nvidia.com/cuda/cusparse/index.html#cusparse-lt-t-gt-csric02).

Note
Instantiations for this template are provided for <float> and <double>.

Definition at line 62 of file cuda_precondition.h.

## ◆ size_type

template<typename Number >
 using CUDAWrappers::PreconditionIC< Number >::size_type = int

Declare the type for container size.

Definition at line 68 of file cuda_precondition.h.

## ◆ PreconditionIC() [1/2]

template<typename Number >
 CUDAWrappers::PreconditionIC< Number >::PreconditionIC ( const Utilities::CUDA::Handle & handle )

Constructor.

## ◆ PreconditionIC() [2/2]

template<typename Number >
 CUDAWrappers::PreconditionIC< Number >::PreconditionIC ( const PreconditionIC< Number > & )
delete

The copy constructor is deleted.

## ◆ ~PreconditionIC()

template<typename Number >
 CUDAWrappers::PreconditionIC< Number >::~PreconditionIC ( )

Destructor. Free all resources that were initialized in this class.

## ◆ operator=()

template<typename Number >
 PreconditionIC & CUDAWrappers::PreconditionIC< Number >::operator= ( const PreconditionIC< Number > & )
delete

The copy assignment operator is deleted.

## ◆ initialize()

template<typename Number >
 void CUDAWrappers::PreconditionIC< Number >::initialize ( const SparseMatrix< Number > & matrix, const AdditionalData & additional_data = AdditionalData() )

Initialize this object. In particular, the given matrix is copied to be modified in-place. For the underlying sparsity pattern pointers are stored. Specifically, this means that the current object can only be used reliably as long as matrix is valid and has not been changed since calling this function.

The additional_data determines if level information are used.

## ◆ vmult()

template<typename Number >
 void CUDAWrappers::PreconditionIC< Number >::vmult ( LinearAlgebra::CUDAWrappers::Vector< Number > & dst, const LinearAlgebra::CUDAWrappers::Vector< Number > & src ) const

Apply the preconditioner.

## ◆ Tvmult()

template<typename Number >
 void CUDAWrappers::PreconditionIC< Number >::Tvmult ( LinearAlgebra::CUDAWrappers::Vector< Number > & dst, const LinearAlgebra::CUDAWrappers::Vector< Number > & src ) const

Apply the preconditioner. Since the preconditioner is symmetric, this is the same as vmult().

## ◆ m()

template<typename Number >
 size_type CUDAWrappers::PreconditionIC< Number >::m ( ) const

Return the dimension of the codomain (or range) space. Note that the matrix is square and has dimension $$m \times m$$.

Note
This function should only be called if the preconditioner has been initialized.

## ◆ n()

template<typename Number >
 size_type CUDAWrappers::PreconditionIC< Number >::n ( ) const

Return the dimension of the codomain (or range) space. Note that the matrix is square and has dimension $$n \times n$$.

Note
This function should only be called if the preconditioner has been initialized.

## ◆ cusparse_handle

template<typename Number >
 cusparseHandle_t CUDAWrappers::PreconditionIC< Number >::cusparse_handle
private

cuSPARSE handle used to call cuSPARSE functions.

Definition at line 166 of file cuda_precondition.h.

## ◆ descr_M

template<typename Number >
 cusparseMatDescr_t CUDAWrappers::PreconditionIC< Number >::descr_M
private

cuSPARSE description of the sparse matrix $$M=LL^T$$.

Definition at line 171 of file cuda_precondition.h.

## ◆ descr_L

template<typename Number >
 cusparseMatDescr_t CUDAWrappers::PreconditionIC< Number >::descr_L
private

cuSPARSE description of the lower triangular matrix $$L$$.

Definition at line 176 of file cuda_precondition.h.

## ◆ info_M

template<typename Number >
 csric02Info_t CUDAWrappers::PreconditionIC< Number >::info_M
private

Solve and analysis structure for $$M=LL^T$$.

Definition at line 181 of file cuda_precondition.h.

## ◆ info_L

template<typename Number >
 csrsv2Info_t CUDAWrappers::PreconditionIC< Number >::info_L
private

Solve and analysis structure for the lower triangular matrix $$L$$.

Definition at line 186 of file cuda_precondition.h.

## ◆ info_Lt

template<typename Number >
 csrsv2Info_t CUDAWrappers::PreconditionIC< Number >::info_Lt
private

Solve and analysis structure for the upper triangular matrix $$L^T$$.

Definition at line 191 of file cuda_precondition.h.

## ◆ matrix_pointer

template<typename Number >
 SmartPointer > CUDAWrappers::PreconditionIC< Number >::matrix_pointer
private

Pointer to the matrix this object was initialized with.

Definition at line 196 of file cuda_precondition.h.

## ◆ P_val_dev

template<typename Number >
 std::unique_ptr CUDAWrappers::PreconditionIC< Number >::P_val_dev
private

Pointer to the values (on the device) of the computed preconditioning matrix.

Definition at line 202 of file cuda_precondition.h.

## ◆ P_row_ptr_dev

template<typename Number >
 const int* CUDAWrappers::PreconditionIC< Number >::P_row_ptr_dev
private

Pointer to the row pointer (on the device) of the sparse matrix this object was initialized with. Guarded by matrix_pointer.

Definition at line 208 of file cuda_precondition.h.

## ◆ P_column_index_dev

template<typename Number >
 const int* CUDAWrappers::PreconditionIC< Number >::P_column_index_dev
private

Pointer to the column indices (on the device) of the sparse matrix this object was initialized with. Guarded by matrix_pointer.

Definition at line 214 of file cuda_precondition.h.

## ◆ tmp_dev

template<typename Number >
 std::unique_ptr CUDAWrappers::PreconditionIC< Number >::tmp_dev
private

Pointer to the value (on the device) for a temporary (helper) vector used in vmult().

Definition at line 220 of file cuda_precondition.h.

## ◆ buffer_dev

template<typename Number >
 std::unique_ptr CUDAWrappers::PreconditionIC< Number >::buffer_dev
private

Pointer to an internal buffer (on the device) that is used for computing the decomposition.

Definition at line 226 of file cuda_precondition.h.

## ◆ policy_L

template<typename Number >
 cusparseSolvePolicy_t CUDAWrappers::PreconditionIC< Number >::policy_L
private

Determine if level information should be generated for the lower triangular matrix $$L$$. This value can be modified through an AdditionalData object.

Definition at line 233 of file cuda_precondition.h.

## ◆ policy_Lt

template<typename Number >
 cusparseSolvePolicy_t CUDAWrappers::PreconditionIC< Number >::policy_Lt
private

Determine if level information should be generated for the upper triangular matrix $$L^T$$. This value can be modified through an AdditionalData object.

Definition at line 240 of file cuda_precondition.h.

## ◆ policy_M

template<typename Number >
 cusparseSolvePolicy_t CUDAWrappers::PreconditionIC< Number >::policy_M
private

Determine if level information should be generated for $$M=LL^T$$. This value can be modified through an AdditionalData object.

Definition at line 246 of file cuda_precondition.h.

## ◆ n_rows

template<typename Number >
 int CUDAWrappers::PreconditionIC< Number >::n_rows
private

The number of rows is the same as for the matrix this object has been initialized with.

Definition at line 252 of file cuda_precondition.h.

## ◆ n_nonzero_elements

template<typename Number >
 int CUDAWrappers::PreconditionIC< Number >::n_nonzero_elements
private

The number of non-zero elements is the same as for the matrix this object has been initialized with.

Definition at line 258 of file cuda_precondition.h.

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