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102 lines
2.8 KiB
C++
102 lines
2.8 KiB
C++
#include <config.h>
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#include <dune/common/fmatrix.hh>
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#include <dune/istl/bcrsmatrix.hh>
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#include <dune/istl/paamg/graph.hh>
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#include <opm/simulators/linalg/GraphColoring.hpp>
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#define BOOST_TEST_MODULE GraphColoringTest
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#define BOOST_TEST_MAIN
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#include <boost/test/unit_test.hpp>
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///! \brief check that all indices are represented in the new ordering.
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void checkAllIndices(const std::vector<std::size_t>& ordering)
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{
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std::vector<int> counters(ordering.size(), 0);
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for(auto index: ordering)
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{
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++counters[index];
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}
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for(auto count: counters)
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{
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BOOST_CHECK(count==1);
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}
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}
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BOOST_AUTO_TEST_CASE(TestWelschPowell)
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{
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using Matrix = Dune::BCRSMatrix<Dune::FieldMatrix<double,1,1>>;
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using Graph = Dune::Amg::MatrixGraph<Matrix>;
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int N = 10;
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Matrix matrix(N*N, N*N, 5, 0.4, Matrix::implicit);
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for( int j = 0; j < N; j++)
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{
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for(int i = 0; i < N; i++)
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{
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auto index = j*10+i;
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matrix.entry(index,index) = 1;
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if ( i > 0 )
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{
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matrix.entry(index,index-1) = 1;
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}
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if ( i < N - 1)
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{
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matrix.entry(index,index+1) = 1;
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}
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if ( j > 0 )
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{
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matrix.entry(index,index-N) = 1;
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}
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if ( j < N - 1)
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{
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matrix.entry(index,index+N) = 1;
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}
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}
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}
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matrix.compress();
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Graph graph(matrix);
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auto colorsTuple = Opm::colorVerticesWelshPowell(graph);
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const auto& colors = std::get<0>(colorsTuple);
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const auto& verticesPerColor = std::get<2>(colorsTuple);
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auto noColors = std::get<1>(colorsTuple);
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auto firstCornerColor = colors[0];
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BOOST_CHECK(noColors == 2);
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// Check for checkerboard coloring
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for( int j = 0, index = 0; j < N; j++)
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{
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auto expectedColor = firstCornerColor;
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for(int i = 0; i < N; i++)
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{
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BOOST_CHECK(colors[index]==expectedColor);
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index++;
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expectedColor = (expectedColor + 1) % 2;
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}
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firstCornerColor=(firstCornerColor + 1) % 2;
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}
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auto newOrder = Opm::reorderVerticesPreserving(colors, noColors, verticesPerColor,
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graph);
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std::vector<std::size_t> colorIndex(noColors, 0);
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std::partial_sum(verticesPerColor.begin(),
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verticesPerColor.begin()+verticesPerColor.size()-1,
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colorIndex.begin()+1);
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for (auto vertex : graph)
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{
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BOOST_CHECK(colorIndex[colors[vertex]]++ == newOrder[vertex]);
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}
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checkAllIndices(newOrder);
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newOrder = Opm::reorderVerticesSpheres(colors, noColors, verticesPerColor,
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graph, 0);
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checkAllIndices(newOrder);
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}
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