PetscVecTools.cpp

/*

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*/

#include "PetscVecTools.hpp"
#include "PetscTools.hpp"
#include <petscviewer.h>
#include <cassert>
#include "DistributedVectorFactory.hpp"
#include "DistributedVector.hpp"
#include "PetscException.hpp"

// Implementation

void PetscVecTools::Finalise(Vec vector)
{
    VecAssemblyBegin(vector);
    VecAssemblyEnd(vector);
}

void PetscVecTools::SetElement(Vec vector, PetscInt row, double value)
{
    PetscInt lo, hi;
    GetOwnershipRange(vector, lo, hi);

    if (row >= lo && row < hi)
    {
        VecSetValues(vector, 1, &row, &value, INSERT_VALUES);
    }
}

void PetscVecTools::AddToElement(Vec vector, PetscInt row, double value)
{
    PetscInt lo, hi;
    GetOwnershipRange(vector, lo, hi);

    if (row >= lo && row < hi)
    {
        VecSetValues(vector, 1, &row, &value, ADD_VALUES);
    }
}

void PetscVecTools::Display(Vec vector)
{
    //Give full precision, scientific notation
    PetscViewerSetFormat(PETSC_VIEWER_STDOUT_WORLD, PETSC_VIEWER_ASCII_MATLAB);
    VecView(vector, PETSC_VIEWER_STDOUT_WORLD);
}

void PetscVecTools::Zero(Vec vector)
{
#if (PETSC_VERSION_MAJOR == 2 && PETSC_VERSION_MINOR == 2) //PETSc 2.2
    PetscScalar zero = 0.0;
    VecSet(&zero, vector);
#else
    VecZeroEntries(vector);
#endif
}

unsigned PetscVecTools::GetSize(Vec vector)
{
    PetscInt size;
    VecGetSize(vector, &size);
    return (unsigned) size;
}

void PetscVecTools::GetOwnershipRange(Vec vector, PetscInt& lo, PetscInt& hi)
{
    VecGetOwnershipRange(vector, &lo, &hi);
}

double PetscVecTools::GetElement(Vec vector, PetscInt row)
{
    PetscInt lo, hi;
    GetOwnershipRange(vector, lo, hi);
    assert(lo <= row && row < hi);

    double* p_vector;
    PetscInt local_index = row-lo;
    VecGetArray(vector, &p_vector);
    double answer = p_vector[local_index];
    VecRestoreArray(vector, &p_vector);

    return answer;
}

void PetscVecTools::AddScaledVector(Vec y, Vec x, double scaleFactor)
{
#if (PETSC_VERSION_MAJOR == 2 && PETSC_VERSION_MINOR == 2) //PETSc 2.2
    VecAXPY(&scaleFactor, x, y);
#else
    VecAXPY(y, scaleFactor, x);
#endif
}

void PetscVecTools::Scale(Vec vector, double scaleFactor)
{
#if (PETSC_VERSION_MAJOR == 2 && PETSC_VERSION_MINOR == 2) //PETSc 2.2
    PETSCEXCEPT( VecScale(&scaleFactor, vector) );
#else
    PETSCEXCEPT( VecScale(vector, scaleFactor) );
#endif
}

void PetscVecTools::WAXPY(Vec w, double a, Vec x, Vec y)
{
#if (PETSC_VERSION_MAJOR == 2 && PETSC_VERSION_MINOR == 2) //PETSc 2.2
    PETSCEXCEPT( VecWAXPY(&a, x, y, w) );
#else
    PETSCEXCEPT( VecWAXPY(w, a, x, y) );
#endif
}

void PetscVecTools::SetupInterleavedVectorScatterGather(Vec interleavedVec, VecScatter& rFirstVariableScatterContext, VecScatter& rSecondVariableScatterContext)
{
    PetscInt num_rows, num_local_rows;

    VecGetSize(interleavedVec, &num_rows);
    VecGetLocalSize(interleavedVec, &num_local_rows);

    IS A11_rows, A22_rows;
    ISCreateStride(PETSC_COMM_WORLD, num_rows/2, 0, 2, &A11_rows);
    ISCreateStride(PETSC_COMM_WORLD, num_rows/2, 1, 2, &A22_rows);

    IS all_vector;
    ISCreateStride(PETSC_COMM_WORLD, num_rows/2, 0, 1, &all_vector);

    unsigned subvector_num_rows = num_rows/2;
    unsigned subvector_local_rows = num_local_rows/2;
    Vec x1_subvector = PetscTools::CreateVec(subvector_num_rows, subvector_local_rows);
    Vec x2_subvector = PetscTools::CreateVec(subvector_num_rows, subvector_local_rows);

    VecScatterCreate(interleavedVec, A11_rows, x1_subvector, all_vector, &rFirstVariableScatterContext);
    VecScatterCreate(interleavedVec, A22_rows, x2_subvector, all_vector, &rSecondVariableScatterContext);

    PetscTools::Destroy(x1_subvector);
    PetscTools::Destroy(x2_subvector);

    ISDestroy(PETSC_DESTROY_PARAM(A11_rows));
    ISDestroy(PETSC_DESTROY_PARAM(A22_rows));
    ISDestroy(PETSC_DESTROY_PARAM(all_vector));
}

void PetscVecTools::DoInterleavedVecScatter(Vec interleavedVec, VecScatter firstVariableScatterContext, Vec firstVariableVec, VecScatter secondVariableScatterContefirstVariableScatterContextt, Vec secondVariableVec)
{
    PetscScalar *p_interleaved_vec;
    PetscScalar *p_1st_variable_vec;
    PetscScalar *p_2nd_variable_vec;

    //  // Note that the first vector is normally locked read-only when this is used
    //    PetscInt lock;
    //    VecLockGet(interleavedVec, &lock);
    //    assert(lock == 1);
#if (PETSC_VERSION_MAJOR == 3 && PETSC_VERSION_MINOR >= 2) //PETSc 3.2 or later
        // Request read-only access properly
        VecGetArrayRead(interleavedVec, (const PetscScalar**)&p_interleaved_vec);
#else
        VecGetArray(interleavedVec, &p_interleaved_vec);
#endif
    VecGetArray(firstVariableVec, &p_1st_variable_vec);
    VecGetArray(secondVariableVec, &p_2nd_variable_vec);

    PetscInt vec_local_size;
    VecGetLocalSize(interleavedVec, &vec_local_size);
    assert(vec_local_size%2 == 0);

    for (PetscInt local_index=0; local_index<vec_local_size/2; local_index++)
    {
        p_1st_variable_vec[local_index] = p_interleaved_vec[2*local_index];
        p_2nd_variable_vec[local_index] = p_interleaved_vec[2*local_index+1];
    }

    VecRestoreArray(interleavedVec, &p_interleaved_vec);
    VecRestoreArray(firstVariableVec, &p_1st_variable_vec);
    VecRestoreArray(secondVariableVec, &p_2nd_variable_vec);

//    DistributedVectorFactory factory(vec_size/2);
//
//    DistributedVector dist_inter_vec = factory.CreateDistributedVector(interleavedVec);
//    DistributedVector::Stripe dist_inter_vec_1st_var(dist_inter_vec, 0);
//    DistributedVector::Stripe dist_inter_vec_2nd_var(dist_inter_vec, 1);
//
//    DistributedVector dist_1st_var_vec = factory.CreateDistributedVector(firstVariableVec);
//    DistributedVector dist_2nd_var_vec = factory.CreateDistributedVector(secondVariableVec);
//
//    for (DistributedVector::Iterator index = dist_1st_var_vec.Begin();
//         index!= dist_1st_var_vec.End();
//         ++index)
//    {
//        dist_1st_var_vec[index] = dist_inter_vec_1st_var[index];
//        dist_2nd_var_vec[index] = dist_inter_vec_2nd_var[index];
//    }


//    //PETSc-3.x.x or PETSc-2.3.3
//#if ( (PETSC_VERSION_MAJOR == 3) || (PETSC_VERSION_MAJOR == 2 && PETSC_VERSION_MINOR == 3 && PETSC_VERSION_SUBMINOR == 3)) //2.3.3 or 3.x.x
//    VecScatterBegin(firstVariableScatterContext, interleavedVec, firstVariableVec, INSERT_VALUES, SCATTER_FORWARD);
//    VecScatterEnd(firstVariableScatterContext, interleavedVec, firstVariableVec, INSERT_VALUES, SCATTER_FORWARD);
//#else
//    VecScatterBegin(interleavedVec, firstVariableVec, INSERT_VALUES, SCATTER_FORWARD, firstVariableScatterContext);
//    VecScatterEnd(interleavedVec, firstVariableVec, INSERT_VALUES, SCATTER_FORWARD, firstVariableScatterContext);
//#endif
//
//    //PETSc-3.x.x or PETSc-2.3.3
//#if ( (PETSC_VERSION_MAJOR == 3) || (PETSC_VERSION_MAJOR == 2 && PETSC_VERSION_MINOR == 3 && PETSC_VERSION_SUBMINOR == 3)) //2.3.3 or 3.x.x
//    VecScatterBegin(secondVariableScatterContefirstVariableScatterContextt, interleavedVec, secondVariableVec, INSERT_VALUES, SCATTER_FORWARD);
//    VecScatterEnd(secondVariableScatterContefirstVariableScatterContextt, interleavedVec, secondVariableVec, INSERT_VALUES, SCATTER_FORWARD);
//#else
//    VecScatterBegin(interleavedVec, secondVariableVec, INSERT_VALUES, SCATTER_FORWARD, secondVariableScatterContefirstVariableScatterContextt);
//    VecScatterEnd(interleavedVec, secondVariableVec, INSERT_VALUES, SCATTER_FORWARD, secondVariableScatterContefirstVariableScatterContextt);
//#endif
}

void PetscVecTools::DoInterleavedVecGather(Vec interleavedVec, VecScatter firstVariableScatterContext, Vec firstVariableVec, VecScatter secondVariableScatterContext, Vec secondVariableVec)
{
    PetscScalar *p_interleaved_vec;
    PetscScalar *p_1st_variable_vec;
    PetscScalar *p_2nd_variable_vec;

    VecGetArray(interleavedVec, &p_interleaved_vec);
    VecGetArray(firstVariableVec, &p_1st_variable_vec);
    VecGetArray(secondVariableVec, &p_2nd_variable_vec);

    PetscInt vec_local_size;
    VecGetLocalSize(interleavedVec, &vec_local_size);
    assert(vec_local_size%2 == 0);

    for (PetscInt local_index=0; local_index<vec_local_size/2; local_index++)
    {
        p_interleaved_vec[2*local_index] = p_1st_variable_vec[local_index];
        p_interleaved_vec[2*local_index+1] = p_2nd_variable_vec[local_index];
    }

    VecRestoreArray(interleavedVec, &p_interleaved_vec);
    VecRestoreArray(firstVariableVec, &p_1st_variable_vec);
    VecRestoreArray(secondVariableVec, &p_2nd_variable_vec);

//#if ( (PETSC_VERSION_MAJOR == 3) || (PETSC_VERSION_MAJOR == 2 && PETSC_VERSION_MINOR == 3 && PETSC_VERSION_SUBMINOR == 3)) //2.3.3 or 3.x.x
//    VecScatterBegin(firstVariableScatterContext, firstVariableVec, interleavedVec, INSERT_VALUES, SCATTER_REVERSE);
//    VecScatterEnd(firstVariableScatterContext, firstVariableVec, interleavedVec, INSERT_VALUES, SCATTER_REVERSE);
//#else
//    VecScatterBegin(firstVariableVec, interleavedVec, INSERT_VALUES, SCATTER_REVERSE, firstVariableScatterContext);
//    VecScatterEnd(firstVariableVec, interleavedVec, INSERT_VALUES, SCATTER_REVERSE, firstVariableScatterContext);
//#endif
//
//#if ( (PETSC_VERSION_MAJOR == 3) || (PETSC_VERSION_MAJOR == 2 && PETSC_VERSION_MINOR == 3 && PETSC_VERSION_SUBMINOR == 3)) //2.3.3 or 3.x.x
//    VecScatterBegin(secondVariableScatterContext, secondVariableVec, interleavedVec, INSERT_VALUES, SCATTER_REVERSE);
//    VecScatterEnd(secondVariableScatterContext, secondVariableVec, interleavedVec, INSERT_VALUES, SCATTER_REVERSE);
//#else
//    VecScatterBegin(secondVariableVec, interleavedVec, INSERT_VALUES, SCATTER_REVERSE, secondVariableScatterContext);
//    VecScatterEnd(secondVariableVec, interleavedVec, INSERT_VALUES, SCATTER_REVERSE, secondVariableScatterContext);
//#endif
}