mirror of
https://github.com/OPM/opm-simulators.git
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130 lines
4.2 KiB
C++
130 lines
4.2 KiB
C++
// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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// vi: set et ts=4 sw=4 sts=4:
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/*
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This file is part of the Open Porous Media project (OPM).
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OPM is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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OPM is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with OPM. If not, see <http://www.gnu.org/licenses/>.
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Consult the COPYING file in the top-level source directory of this
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module for the precise wording of the license and the list of
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copyright holders.
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*/
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/*!
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* \file
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* \copydoc PffGridVector
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*/
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#ifndef EWOMS_PFF_GRID_VECTOR_HH
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#define EWOMS_PFF_GRID_VECTOR_HH
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#include <opm/models/utils/prefetch.hh>
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#include <dune/grid/common/mcmgmapper.hh>
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#include <dune/common/version.hh>
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#include <vector>
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namespace Opm {
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/*!
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* \brief A random-access container which stores data attached to a grid's degrees of
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* freedom in a prefetch friendly manner.
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*
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* This container often reduces the number of cache faults considerably, thus improving
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* performance. On the flipside data cannot be written to on an individual basis and it
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* requires significantly more memory than a plain array. PffVector stands for "PreFetch
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* Friendly Grid Vector".
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*/
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template <class GridView, class Stencil, class Data, class DofMapper>
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class PffGridVector
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{
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using Element = typename GridView::template Codim<0>::Entity;
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using ElementMapper = Dune::MultipleCodimMultipleGeomTypeMapper<GridView>;
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public:
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PffGridVector(const GridView& gridView, const DofMapper& dofMapper)
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: gridView_(gridView)
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, elementMapper_(gridView_, Dune::mcmgElementLayout())
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, dofMapper_(dofMapper)
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{ }
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template <class DistFn>
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void update(const DistFn& distFn)
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{
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unsigned numElements = gridView_.size(/*codim=*/0);
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unsigned numLocalDofs = computeNumLocalDofs_();
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elemData_.resize(numElements);
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data_.resize(numLocalDofs);
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// update the pointers for the element data: for this, we need to loop over the
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// whole grid and update a stencil for each element
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Data *curElemDataPtr = &data_[0];
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Stencil stencil(gridView_, dofMapper_);
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for (const auto& elem : elements(gridView_)) {
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// set the DOF data pointer for the current element
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unsigned elemIdx = elementMapper_.index(elem);
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elemData_[elemIdx] = curElemDataPtr;
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stencil.update(elem);
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unsigned numDof = stencil.numDof();
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for (unsigned localDofIdx = 0; localDofIdx < numDof; ++ localDofIdx)
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distFn(curElemDataPtr[localDofIdx], stencil, localDofIdx);
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// update the element data pointer to make it point to the beginning of the
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// data for DOFs of the next element
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curElemDataPtr += numDof;
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}
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}
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void prefetch(const Element& elem) const
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{
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unsigned elemIdx = elementMapper_.index(elem);
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// we use 0 as the temporal locality, because it is reasonable to assume that an
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// entry will only be accessed once.
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::Opm::prefetch</*temporalLocality=*/0>(elemData_[elemIdx]);
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}
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const Data& get(const Element& elem, unsigned localDofIdx) const
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{
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unsigned elemIdx = elementMapper_.index(elem);
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return elemData_[elemIdx][localDofIdx];
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}
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private:
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unsigned computeNumLocalDofs_() const
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{
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unsigned result = 0;
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// loop over the whole grid and sum up the number of local DOFs of all Stencils
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Stencil stencil(gridView_, dofMapper_);
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for (const auto& elem : elements(gridView_)) {
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stencil.update(elem);
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result += stencil.numDof();
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}
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return result;
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}
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GridView gridView_;
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ElementMapper elementMapper_;
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const DofMapper& dofMapper_;
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std::vector<Data> data_;
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std::vector<Data*> elemData_;
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};
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} // namespace Opm
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#endif
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