Hi,
> I'm quite newbie to Viennacl and having trouble in my first try of
> hello-world project. Here is the snippet of my code.
>
> #define VIENNACL_WITH_OPENCL
> #include "viennacl/vector.hpp"
> #include "viennacl/compressed_matrix.hpp"
> #include "viennacl/linalg/cg.hpp"
>
> void test_viennacl(std::vector<std::string> &args)
> {
> const int ndim = 16;
>
> // identity matrix
> std::vector< std::map< unsigned int, float> > cpu_sparse_matrix(ndim);
> for( auto i = 0; i < ndim; i++ ) {
> cpu_sparse_matrix[i][i] = 1.0;
> }
>
> viennacl::compressed_matrix<float> A(ndim, ndim);
> copy(cpu_sparse_matrix, A);
>
> viennacl::vector<float> x(ndim);
> viennacl::vector<float> b(ndim);
>
> // b = [ 0, 1, ..., ndim-1 ]
> std::vector<float> vec_init(ndim);
> for( auto i = 0; i < vec_init.size(); i++ ) {
> vec_init[i] = i;
> }
> viennacl::copy( vec_init, b );
>
> // x = A*b
> x = viennacl::linalg::prod(A, b);
>
> // A*x = b
> viennacl::linalg::cg_tag cg();
> x = viennacl::linalg::solve(A, b, viennacl::linalg::cg_tag());
>
> return;
> }
>
>
> As written in code, I wanted to do two things : matrix-vector
> multiplication and solving linear equation. Multiplication(prod) is done
> easily but solving equation(solve) is not, system went frozen. I built
> and tried examples/tutorial/iterative.cpp and got same situation.
>
> My working envirioment is :
> Windows 8.1
> Intel i5 6600 (a.k.a skylake)
> Intel Opencl SDK (sdk version 6.1)
> Visual studio 2015
>
> Any comment would be appreciated. Thank you.
Hmm, I can run the code on my machine on an NVIDIA GPU without problems
and obtain the correct result of the call to solve().
As far as I'm aware, there have been some issues with Intel GPUs
recently. Since I don't have a proper machine at hand to debug this
directly, I couldn't track this down yet. Is the SDK version 6.1 the
latest available?
Best regards,
Karli
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