rocalutionSolverBackend.hpp

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/*
  Copyright 2022 Equinor ASA
 
  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_ROCALUTIONSOLVER_BACKEND_HEADER_INCLUDED
#define OPM_ROCALUTIONSOLVER_BACKEND_HEADER_INCLUDED
 
#include <opm/simulators/linalg/bda/BdaResult.hpp>
#include <opm/simulators/linalg/bda/BdaSolver.hpp>
#include <opm/simulators/linalg/bda/WellContributions.hpp>
 
namespace rocalution {
template<class Matrix, class Vector, class Scalar> class BiCGStab;
template<class Matrix, class Vector, class Scalar> class ILU;
template<class Scalar> class LocalMatrix;
template<class Scalar> class LocalVector;
}
 
namespace Opm::Accelerator {
 
template<class Scalar, unsigned int block_size>
class rocalutionSolverBackend : public BdaSolver<Scalar,block_size>
{
    using Base = BdaSolver<Scalar,block_size>;
 
    using Base::N;
    using Base::Nb;
    using Base::nnz;
    using Base::nnzb;
    using Base::verbosity;
    using Base::platformID;
    using Base::deviceID;
    using Base::maxit;
    using Base::tolerance;
    using Base::initialized;
 
private:
    std::vector<Scalar> h_x; // store solution vector on host
    int *tmp_rowpointers;    // store matrix on host, this pointer is given to and freed by rocalution
    int *tmp_colindices;     // store matrix on host, this pointer is given to and freed by rocalution
    Scalar* tmp_nnzvalues;   // store matrix on host, this pointer is given to and freed by rocalution
 
    using Mat = rocalution::LocalMatrix<Scalar>;
    using Vec = rocalution::LocalVector<Scalar>;
 
    std::unique_ptr<rocalution::ILU<Mat,Vec,Scalar>> roc_prec;
    std::unique_ptr<rocalution::BiCGStab<Mat,Vec,Scalar>> roc_solver;
 
    void initialize(BlockedMatrix<Scalar>* matrix);
 
    void convert_matrix(BlockedMatrix<Scalar>* matrix);
 
public:
    rocalutionSolverBackend(int linear_solver_verbosity,
                            int maxit, Scalar tolerance);
 
    ~rocalutionSolverBackend();
 
    SolverStatus solve_system(std::shared_ptr<BlockedMatrix<Scalar>> matrix,
                              Scalar* b,
                              std::shared_ptr<BlockedMatrix<Scalar>> jacMatrix,
                              WellContributions<Scalar>& wellContribs,
                              BdaResult& res) override;
 
    void get_result(Scalar* x) override;
    
}; // end class rocalutionSolverBackend
 
} // namespace Opm::Accelerator
 
#endif