Kokkos Node API and Local Linear Algebra Kernels Version of the Day
Tsqr_TestSetup.hpp
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00041 
00042 #ifndef __TSQR_TestSetup_hpp
00043 #define __TSQR_TestSetup_hpp
00044 
00045 #include <Tsqr_MessengerBase.hpp>
00046 #include <Tsqr_Random_GlobalMatrix.hpp>
00047 #include <Tsqr_Matrix.hpp>
00048 #include <Teuchos_ScalarTraits.hpp>
00049 
00050 #include <vector>
00051 
00052 
00053 namespace TSQR { 
00054   namespace Test {
00055 
00056     template<class Ordinal, class CommOrdinal>
00057     Ordinal 
00058     numLocalRows (const Ordinal nrowsGlobal, 
00059       const CommOrdinal myRank,
00060       const CommOrdinal nprocs)
00061     {
00062       const Ordinal nrowsLocal = nrowsGlobal / Ordinal(nprocs);
00063       const Ordinal remainder = nrowsGlobal - nrowsLocal * Ordinal(nprocs);
00064       if (myRank != nprocs - 1)
00065   return nrowsLocal;
00066       else
00067   return nrowsLocal + remainder;
00068     }
00069 
00076     template<class MatrixViewType, class Generator>
00077     void
00078     distributedTestProblem (Generator& generator,
00079           MatrixViewType& A_local,
00080           MessengerBase<typename MatrixViewType::ordinal_type>* const ordinalComm,
00081           MessengerBase<typename MatrixViewType::scalar_type>* const scalarComm)
00082     {
00083       typedef typename MatrixViewType::ordinal_type ordinal_type;
00084       typedef typename MatrixViewType::scalar_type scalar_type;
00085       typedef typename Teuchos::ScalarTraits< scalar_type >::magnitudeType magnitude_type;
00086 
00087       const int myRank = scalarComm->rank();
00088       const ordinal_type ncols = A_local.ncols();
00089 
00090       if (myRank == 0)
00091   {
00092     // Generate some singular values for the test problem.
00093     std::vector< magnitude_type > singular_values (ncols);
00094     singular_values[0] = 1.0;
00095     for (ordinal_type k = 1; k < ncols; ++k)
00096       singular_values[k] = singular_values[k-1] / double(2);
00097 
00098     // Generate the test problem.  All MPI processes
00099     // participate, but only Proc 0 generates the (pseudo)random
00100     // numbers.
00101     TSQR::Random::randomGlobalMatrix (&generator, A_local, 
00102               &singular_values[0], ordinalComm,
00103               scalarComm);
00104   }
00105       else
00106   {
00107     // This helps C++ deduce the type; the values aren't read on
00108     // this proc.
00109     magnitude_type singular_values[1];
00110 
00111     // All MPI processes participate in the distribution of the
00112     // test matrix.
00113     TSQR::Random::randomGlobalMatrix (&generator, A_local, 
00114               &singular_values[0], ordinalComm,
00115               scalarComm);
00116   }
00117     }
00118   } // namespace Test
00119 } // namespace TSQR
00120 
00121 #endif // __TSQR_TestSetup_hpp
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