TestSkylineLU.cc

// -*- tab-width: 2; indent-tabs-mode: nil; coding: utf-8-with-signature -*-
//-----------------------------------------------------------------------------
// Copyright 2000-2026 CEA (www.cea.fr) IFPEN (www.ifpenergiesnouvelles.com)
// See the top-level COPYRIGHT file for details.
// SPDX-License-Identifier: Apache-2.0
//-----------------------------------------------------------------------------
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
/*
 * This file is based on the work on AMGCL library (version march 2026)
 * which can be found at https://github.com/ddemidov/amgcl.
 *
 * Copyright (c) 2012-2022 Denis Demidov <dennis.demidov@gmail.com>
 * SPDX-License-Identifier: MIT
 */
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
#include <gtest/gtest.h>
 
#include "arccore/alina/Adapters.h"
#include "arccore/alina/SkylineLUSolver.h"
#include "arccore/alina/BuiltinBackend.h"
#include "arccore/alina/Profiler.h"
#include "SampleProblemCommon.h"
 
namespace
{
Arcane::Alina::Profiler prof;
}
 
using namespace Arcane;
 
TEST(alina_test_skyline_lu, skyline_lu)
{
  std::vector<ptrdiff_t> ptr;
  std::vector<ptrdiff_t> col;
  std::vector<double> val;
  std::vector<double> rhs;
 
  size_t n = sample_problem(16, val, col, ptr, rhs);
 
  auto A = Alina::adapter::zero_copy(n, ptr.data(), col.data(), val.data());
 
  Alina::solver::SkylineLUSolver<double> solve(*A);
 
  std::vector<double> x(n);
  std::vector<double> r(n);
 
  solve(rhs, x);
 
  Alina::backend::residual(rhs, *A, x, r);
 
  ASSERT_NEAR(sqrt(Alina::backend::inner_product(r, r)), 0.0, 1e-8);
}