PCBlockDiagonal.hpp

/*

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*/

#ifndef PCBLOCKDIAGONAL_HPP_
#define PCBLOCKDIAGONAL_HPP_

#include <cassert>
#include <petscvec.h>
#include <petscmat.h>
#include <petscksp.h>
#include <petscpc.h>
#include "PetscTools.hpp"

#if (PETSC_VERSION_MAJOR == 3 && PETSC_VERSION_MINOR >= 1) //PETSc 3.1 or later
PetscErrorCode PCBlockDiagonalApply(PC pc_context, Vec x, Vec y);
#else
PetscErrorCode PCBlockDiagonalApply(void* pc_context, Vec x, Vec y);
#endif

class PCBlockDiagonal
{
public:

    typedef struct{
        Mat A11_matrix_subblock; 
        Mat A22_matrix_subblock; 
        PC  PC_amg_A11; 
        PC  PC_amg_A22; 
        Vec x1_subvector;
        Vec x2_subvector;
        Vec y1_subvector;
        Vec y2_subvector;
        VecScatter A11_scatter_ctx;
        VecScatter A22_scatter_ctx;
#ifdef TRACE_KSP
        double mScatterTime;
        double mA1PreconditionerTime;
        double mA2PreconditionerTime;
        double mGatherTime;
#endif

    } PCBlockDiagonalContext;

    PCBlockDiagonalContext mPCContext; 
    PC mPetscPCObject;
    PCBlockDiagonal(KSP& rKspObject);

    ~PCBlockDiagonal();

private:

    void PCBlockDiagonalCreate(KSP& rKspObject);

    void PCBlockDiagonalSetUp();
};

#endif /*PCBLOCKDIAGONAL_HPP_*/