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_*/