GlobalLinSysXxt.cpp

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///////////////////////////////////////////////////////////////////////////////
//
// File: GlobalLinSysXxt.cpp
//
// For more information, please see: http://www.nektar.info
//
// The MIT License
//
// Copyright (c) 2006 Division of Applied Mathematics, Brown University (USA),
// Department of Aeronautics, Imperial College London (UK), and Scientific
// Computing and Imaging Institute, University of Utah (USA).
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// Software is furnished to do so, subject to the following conditions:
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//
// Description: GlobalLinSysXxt definition
//
///////////////////////////////////////////////////////////////////////////////
 
#include <boost/core/ignore_unused.hpp>
 
#include <LibUtilities/Communication/Xxt.hpp>
#include <MultiRegions/GlobalLinSysXxt.h>
 
namespace Nektar
{
namespace MultiRegions
{
/**
 * @class GlobalLinSysXxt
 *
 * Solves a linear system using direct methods.
 */
 
/// Constructor for full direct matrix solve.
GlobalLinSysXxt::GlobalLinSysXxt(
    const GlobalLinSysKey &pKey, const std::weak_ptr<ExpList> &pExp,
    const std::shared_ptr<AssemblyMap> &pLocToGloMap)
    : GlobalLinSys(pKey, pExp, pLocToGloMap)
{
    m_crsData = 0;
}
 
GlobalLinSysXxt::~GlobalLinSysXxt()
{
    Xxt::Finalise(m_crsData);
}
 
/// Solve the linear system for given input and output vectors.
void GlobalLinSysXxt::v_SolveLinearSystem(
    const int pNumRows, const Array<OneD, const NekDouble> &pInput,
    Array<OneD, NekDouble> &pOutput, const AssemblyMapSharedPtr &pLocToGloMap,
    const int pNumDir)
{
    boost::ignore_unused(pNumRows, pLocToGloMap, pNumDir);
 
    int nLocal = m_map.size();
    Array<OneD, NekDouble> vLocalIn(nLocal, 0.0);
    Array<OneD, NekDouble> vLocalOut(nLocal, 0.0);
    GlobalToLocalNoSign(pInput, vLocalIn);
    Xxt::Solve(vLocalOut, m_crsData, vLocalIn);
    LocalToGlobalNoSign(vLocalOut, pOutput);
}
 
void GlobalLinSysXxt::GlobalToLocalNoSign(
    const Array<OneD, const NekDouble> &global, Array<OneD, NekDouble> &local)
{
    Vmath::Gathr(m_map.size(), m_locToGloSignMult.get(), global.get(),
                 m_map.get(), local.get());
}
 
void GlobalLinSysXxt::LocalToGlobalNoSign(
    const Array<OneD, const NekDouble> &local, Array<OneD, NekDouble> &global)
{
    Vmath::Scatr(m_map.size(), local.get(), m_map.get(), global.get());
}
 
} // namespace MultiRegions
} // namespace Nektar