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/*
HEADER
// ***********************************************************************
//
// Ifpack2: Templated Object-Oriented Algebraic Preconditioner Package
// Copyright (2009) Sandia Corporation
//
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions? Contact Michael A. Heroux (maherou@sandia.gov)
//
// ***********************************************************************
//@HEADER
*/
/// \file Ifpack2_UnitTestSGSMT.cpp
/// \brief Unit test for multithreaded symmetric Gauss-Seidel
#include "Teuchos_UnitTestHarness.hpp"
#include "Ifpack2_UnitTestHelpers.hpp"
#include "Ifpack2_Relaxation.hpp"
#include "MatrixMarket_Tpetra.hpp"
#include <KokkosSparse_gauss_seidel.hpp>
namespace { // (anonymous)
using Teuchos::RCP;
typedef tif_utest::Node Node;
using std::endl;
TEUCHOS_UNIT_TEST_TEMPLATE_3_DECL(SGS_MT, JacobiComparison, Scalar, LO, GO)
{
using Teuchos::ArrayView;
using Teuchos::Array;
using Teuchos::Comm;
using Teuchos::ParameterList;
using std::endl;
typedef Tpetra::CrsMatrix<Scalar, LO, GO, Node> crs_matrix_type;
typedef Tpetra::Map<LO, GO, Node> map_type;
typedef Tpetra::Vector<Scalar, LO, GO, Node> vec_type;
typedef Tpetra::RowMatrix<Scalar, LO, GO, Node> row_matrix_type;
typedef Teuchos::ScalarTraits<Scalar> STS;
Teuchos::OSTab tab0 (out);
out << "Test multiple threaded SGS sweeps compared w.r.t. Jacobi" << endl;
Teuchos::OSTab tab1 (out);
RCP<const Comm<int> > comm = Tpetra::getDefaultComm ();
Tpetra::MatrixMarket::Reader<crs_matrix_type> crs_reader;
std::string file_name = "sherman1.mtx";
RCP<const crs_matrix_type> A = crs_reader.readSparseFile(file_name, comm);
RCP<const map_type> rowMap = A->getRowMap();
RCP<const map_type> domainMap = rowMap;
RCP<const map_type> rangeMap = rowMap;
vec_type X_wanted (domainMap);
vec_type Y_result (rangeMap);
X_wanted.randomize ();
A->apply(X_wanted, Y_result);
// Test Symmetric Gauss-Seidel (SGS) with three sweeps.
// Start by letting SGS set the starting solution to zero.
ParameterList params_mt_sgs;
params_mt_sgs.set ("relaxation: type", "MT Gauss-Seidel");
params_mt_sgs.set ("relaxation: sweeps", 10);
params_mt_sgs.set ("relaxation: zero starting solution", true);
Ifpack2::Relaxation<row_matrix_type> prec_mt_sgs (A);
prec_mt_sgs.setParameters (params_mt_sgs);
TEST_NOTHROW( prec_mt_sgs.initialize () );
TEST_NOTHROW( prec_mt_sgs.compute () );
vec_type X_seek (domainMap);
X_seek.putScalar (STS::zero ());
vec_type initial_X_diff(X_seek, Teuchos::Copy);
initial_X_diff.update (1, X_wanted, -1);
double initial_normInf = initial_X_diff.normInf ();
prec_mt_sgs.apply (Y_result, X_seek);
vec_type X_diff_mtgs(X_seek, Teuchos::Copy);
X_diff_mtgs.update (1, X_wanted, -1);
double normInf_mt_gs = X_diff_mtgs.normInf ();
ParameterList params_jacobi;
params_jacobi.set ("relaxation: type", "Jacobi");
params_jacobi.set ("relaxation: sweeps", 10);
params_jacobi.set ("relaxation: zero starting solution", true);
Ifpack2::Relaxation<row_matrix_type> prec_jacobi(A);
prec_jacobi.setParameters (params_jacobi);
TEST_NOTHROW( prec_jacobi.initialize () );
TEST_NOTHROW( prec_jacobi.compute () );
X_seek.putScalar (STS::zero ());
prec_jacobi.apply (Y_result, X_seek);
vec_type X_diff_jacobi(X_seek, Teuchos::Copy);
X_diff_jacobi.update (1, X_wanted, -1);
double normInf_jacobi = X_diff_jacobi.normInf ();
int sgs_improve = initial_normInf > normInf_mt_gs;
int sgs_better_than_jacobi = normInf_mt_gs < normInf_jacobi;
out << "Initial Norm:" << initial_normInf
<< " MT GS Norm:" << normInf_mt_gs
<< " Jacobi Norm:" << normInf_jacobi << std::endl;
TEST_EQUALITY( sgs_improve, 1 );
TEST_EQUALITY( sgs_better_than_jacobi, 1 );
}
#define UNIT_TEST_GROUP_SC_LO_GO( Scalar, LO, GO ) \
TEUCHOS_UNIT_TEST_TEMPLATE_3_INSTANT( SGS_MT, JacobiComparison, Scalar, LO, GO )
#include "Ifpack2_ETIHelperMacros.h"
IFPACK2_ETI_MANGLING_TYPEDEFS()
// TODO (mfh 24 Aug 2016) Test complex Scalar types
IFPACK2_INSTANTIATE_SLG_REAL( UNIT_TEST_GROUP_SC_LO_GO )
} // namespace (anonymous)
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