petsc_solver_unit_tests.cpp

/*
 * petsc_solver_unit_tests.hpp
 *
 *  Created on: Jun 19, 2017
 *      Author: i-bird
 */

#ifndef OPENFPM_NUMERICS_SRC_SOLVERS_PETSC_SOLVER_UNIT_TESTS_CPP_
#define OPENFPM_NUMERICS_SRC_SOLVERS_PETSC_SOLVER_UNIT_TESTS_CPP_

#ifdef HAVE_PETSC

#define BOOST_TEST_DYN_LINK
#include <boost/test/unit_test.hpp>

#include "petsc_solver_report_unit_tests.hpp"

#include "Grid/grid_dist_id.hpp"
#include "Matrix/SparseMatrix.hpp"
#include "Vector/Vector.hpp"
#include "FiniteDifference/Laplacian.hpp"
#include "FiniteDifference/FDScheme.hpp"
#include "Solvers/petsc_solver.hpp"


BOOST_AUTO_TEST_SUITE( mg_solvers_test )


BOOST_AUTO_TEST_CASE( laplacian_3D_int_zero_mg )
{
    constexpr unsigned int phi = 0;
    typedef Field<phi,poisson_nn_helm> phi_f;

    Vcluster & v_cl = create_vcluster();
    if (v_cl.getProcessingUnits() != 3)
        return;

    Ghost<3,long int> g(2);
    Ghost<3,long int> stencil_max(2);
    Box<3,float> domain({0.0,0.0,0.0},{1.0,1.0,1.0});

    periodicity<3> p({PERIODIC,PERIODIC,PERIODIC});

    typedef Lap<phi_f,poisson_nn_helm,CENTRAL_SYM> poisson;
    grid_dist_id<3,float,aggregate<float>> psi({64,64,64},domain,g,p);
    grid_dist_id<3,float,aggregate<float>> psi2(psi.getDecomposition(),{64,64,64},g);

    // Fill B

    size_t center_x = psi.size(0) / 2;
    size_t center_y = psi.size(1) / 2;
    size_t center_z = psi.size(2) / 2;
    auto it = psi.getDomainIterator();

    while (it.isNext())
    {
        auto key = it.get();
        auto gkey = it.getGKey(key);

        float sx = (float)(gkey.get(0))-center_x;
        float sy = (float)(gkey.get(1))-center_y;
        float sz = (float)(gkey.get(2))-center_z;

        float gs = 100.0*exp(-((sx*sx)+(sy*sy)+(sz*sz))/100.0);

        psi.get<0>(key) = sin(2*M_PI*sx/psi.size(0))*sin(2*M_PI*sy/psi.size(1))*sin(2*M_PI*sz/psi.size(2))*gs;
        psi2.get<0>(key) = sin(2*M_PI*sx/psi.size(0))*sin(2*M_PI*sy/psi.size(1))*sin(2*M_PI*sz/psi.size(2))*gs;

        ++it;
    }

    FDScheme<poisson_nn_helm> fd(stencil_max, domain, psi);

    fd.template impose_dit<0>(poisson(),psi,psi.getDomainIterator());

    petsc_solver<double> solver;
    solver.setSolver(KSPBCGS);
    solver.setAbsTol(0.01);
    solver.setMaxIter(500);


    solver.setPreconditioner(PCHYPRE_BOOMERAMG);
    solver.setPreconditionerAMG_nl(6);
    solver.setPreconditionerAMG_maxit(3);
    solver.setPreconditionerAMG_relax("SOR/Jacobi");
    solver.setPreconditionerAMG_cycleType("V",6,6);
    solver.setPreconditionerAMG_coarsen("HMIS");
    solver.setPreconditionerAMG_coarsenNodalType(0);

    timer tm_solve;
    tm_solve.start();
    auto x_ = solver.solve(fd.getA(),fd.getB());
    tm_solve.stop();

    fd.template copy<phi>(x_,psi);
    psi.write("AMG_psi");

    #ifdef HAVE_OSX
    bool check = compare("AMG_psi_" + std::to_string(v_cl.getProcessUnitID()) + ".vtk","test/AMG_psi_" + std::to_string(v_cl.getProcessUnitID()) + "_test_osx.vtk");
    #else
    #if __GNUC__ == 6
    bool check = compare("AMG_psi_" + std::to_string(v_cl.getProcessUnitID()) + ".vtk","test/AMG_psi_" + std::to_string(v_cl.getProcessUnitID()) + "_test_GCC6.vtk");
    #endif
    #if __GNUC__ == 4
    bool check = compare("AMG_psi_" + std::to_string(v_cl.getProcessUnitID()) + ".vtk","test/AMG_psi_" + std::to_string(v_cl.getProcessUnitID()) + "_test_GCC4.vtk");
    #endif
    #endif

    BOOST_REQUIRE_EQUAL(check,true);


    // Resolve
    timer tm_solve2;
    tm_solve2.start();
    auto x2_ = solver.solve(fd.getB());
    tm_solve2.stop();

    fd.template copy<phi>(x_,psi2);
    psi2.write("AMG_psi2");

    #ifdef HAVE_OSX
    check = compare("AMG_psi2_" + std::to_string(v_cl.getProcessUnitID()) + ".vtk","test/AMG_psi2_" + std::to_string(v_cl.getProcessUnitID()) + "_test_osx.vtk");
    #else
    #if __GNUC__ == 6
    check = compare("AMG_psi2_" + std::to_string(v_cl.getProcessUnitID()) + ".vtk","test/AMG_psi2_" + std::to_string(v_cl.getProcessUnitID()) + "_test_GCC6.vtk");
    #endif
    #if __GNUC__ == 4
    check = compare("AMG_psi2_" + std::to_string(v_cl.getProcessUnitID()) + ".vtk","test/AMG_psi2_" + std::to_string(v_cl.getProcessUnitID()) + "_test_GCC4.vtk");
    #endif
    #endif
    BOOST_REQUIRE_EQUAL(check,true);
}

BOOST_AUTO_TEST_SUITE_END()

#endif

#endif /* OPENFPM_NUMERICS_SRC_SOLVERS_PETSC_SOLVER_UNIT_TESTS_CPP_ */