/usr/include/trilinos/Tsqr_TestSetup.hpp is in libtrilinos-tpetra-dev 12.12.1-5.
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// Kokkos: Node API and Parallel Node Kernels
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#ifndef __TSQR_TestSetup_hpp
#define __TSQR_TestSetup_hpp
#include <Tsqr_MessengerBase.hpp>
#include <Tsqr_Random_GlobalMatrix.hpp>
#include <Tsqr_Matrix.hpp>
#include <Teuchos_ScalarTraits.hpp>
#include <vector>
namespace TSQR {
namespace Test {
template<class Ordinal, class CommOrdinal>
Ordinal
numLocalRows (const Ordinal nrowsGlobal,
const CommOrdinal myRank,
const CommOrdinal nprocs)
{
const Ordinal nrowsLocal = nrowsGlobal / Ordinal(nprocs);
const Ordinal remainder = nrowsGlobal - nrowsLocal * Ordinal(nprocs);
if (myRank != nprocs - 1)
return nrowsLocal;
else
return nrowsLocal + remainder;
}
/// \param generator [in/out] Proc 0 is the only MPI process that
/// generates pseudorandom numbers. This allows us to use a
/// sequential PRNG. Otherwise, we would have to use a parallel
/// PRNG, in order to prevent correlations between numbers
/// generated on different MPI processes. On processes other than
/// Proc 0, generator is not touched.
template<class MatrixViewType, class Generator>
void
distributedTestProblem (Generator& generator,
MatrixViewType& A_local,
MessengerBase<typename MatrixViewType::ordinal_type>* const ordinalComm,
MessengerBase<typename MatrixViewType::scalar_type>* const scalarComm)
{
typedef typename MatrixViewType::ordinal_type ordinal_type;
typedef typename MatrixViewType::scalar_type scalar_type;
typedef typename Teuchos::ScalarTraits< scalar_type >::magnitudeType magnitude_type;
const int myRank = scalarComm->rank();
const ordinal_type ncols = A_local.ncols();
if (myRank == 0)
{
// Generate some singular values for the test problem.
std::vector< magnitude_type > singular_values (ncols);
singular_values[0] = 1.0;
for (ordinal_type k = 1; k < ncols; ++k)
singular_values[k] = singular_values[k-1] / double(2);
// Generate the test problem. All MPI processes
// participate, but only Proc 0 generates the (pseudo)random
// numbers.
TSQR::Random::randomGlobalMatrix (&generator, A_local,
&singular_values[0], ordinalComm,
scalarComm);
}
else
{
// This helps C++ deduce the type; the values aren't read on
// this proc.
magnitude_type singular_values[1];
// All MPI processes participate in the distribution of the
// test matrix.
TSQR::Random::randomGlobalMatrix (&generator, A_local,
&singular_values[0], ordinalComm,
scalarComm);
}
}
} // namespace Test
} // namespace TSQR
#endif // __TSQR_TestSetup_hpp
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