CuSeqILU0.hpp

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/*
  Copyright 2022-2023 SINTEF AS
 
  This file is part of the Open Porous Media project (OPM).
 
  OPM is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.
 
  OPM is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
 
  You should have received a copy of the GNU General Public License
  along with OPM.  If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef OPM_CUSEQILU0_HPP
#define OPM_CUSEQILU0_HPP
 
#include <dune/istl/preconditioner.hh>
#include <opm/simulators/linalg/PreconditionerWithUpdate.hpp>
#include <opm/simulators/linalg/cuistl/CuSparseMatrix.hpp>
#include <opm/simulators/linalg/cuistl/detail/CuMatrixDescription.hpp>
#include <opm/simulators/linalg/cuistl/detail/CuSparseHandle.hpp>
#include <opm/simulators/linalg/cuistl/detail/CuSparseResource.hpp>
 
 
 
namespace Opm::cuistl
{
template <class M, class X, class Y, int l = 1>
class CuSeqILU0 : public Dune::PreconditionerWithUpdate<X, Y>
{
public:
    using matrix_type = typename std::remove_const<M>::type ;
    using domain_type = X;
    using range_type = Y;
    using field_type = typename X::field_type;
 
    CuSeqILU0(const M& A, field_type w);
 
    virtual void pre(X& x, Y& b) override;
 
    virtual void apply(X& v, const Y& d) override;
 
    virtual void post(X& x) override;
 
    virtual Dune::SolverCategory::Category category() const override;
 
    virtual void update() override;
 
 
    static constexpr bool shouldCallPre()
    {
        return false;
    }
 
    static constexpr bool shouldCallPost()
    {
        return false;
    }
 
 
private:
    const M& m_underlyingMatrix;
    field_type m_w;
 
    CuSparseMatrix<field_type> m_LU;
 
    CuVector<field_type> m_temporaryStorage;
 
 
    detail::CuSparseMatrixDescriptionPtr m_descriptionL;
    detail::CuSparseMatrixDescriptionPtr m_descriptionU;
    detail::CuSparseResource<bsrsv2Info_t> m_infoL;
    detail::CuSparseResource<bsrsv2Info_t> m_infoU;
    detail::CuSparseResource<bsrilu02Info_t> m_infoM;
 
    std::unique_ptr<CuVector<field_type>> m_buffer;
    detail::CuSparseHandle& m_cuSparseHandle;
 
    bool m_analysisDone = false;
 
    void analyzeMatrix();
    size_t findBufferSize();
 
    void createILU();
 
    void updateILUConfiguration();
};
} // end namespace Opm::cuistl
 
#endif