Hi,
I would like to use ViennaCL in order to use the block-ILU0 preconditioner to
solve iteratively my linear system using the 4 cores of my Macbook Pro. I am
using Mac OSX 10.10.3 and ViennalCL 1.6.2.
I have no problem running the following program on what I think is the GPU.
#include <iostream>
#include <vector>
#define VIENNACL_WITH_OPENCL
#include <viennacl/scalar.hpp>
#include <viennacl/vector.hpp>
#include <viennacl/compressed_matrix.hpp>
#include <viennacl/linalg/bicgstab.hpp>
#include <viennacl/linalg/ilu.hpp>
int main(int argc, const char *argv[])
{
//viennacl::ocl::set_context_device_type(0, viennacl::ocl::cpu_tag());
auto n = std::size_t{1000};
auto cpu_sparse_matrix = std::vector<std::map<unsigned int, float>>(n);
for (std::size_t i = 0; i < n; i++) {
cpu_sparse_matrix[i][i] = 1.0;
}
auto vcl_matrix = viennacl::compressed_matrix<float>(n, n);
viennacl::copy(cpu_sparse_matrix, vcl_matrix);
auto vcl_rhs = viennacl::vector<float>(n);
for (std::size_t i = 0; i < n; i++) {
vcl_rhs[i] = 1.0;
}
auto vcl_block_ilu0 = viennacl::linalg::block_ilu_precond<
viennacl::compressed_matrix<float>, viennacl::linalg::ilu0_tag>(
vcl_matrix, viennacl::linalg::ilu0_tag());
auto vcl_result = viennacl::linalg::solve(vcl_matrix, vcl_rhs,
viennacl::linalg::bicgstab_tag(), vcl_block_ilu0);
std::cout << vcl_result[0] << std::endl;
std::cout << vcl_result[n - 1] << std::endl;
return 0;
}
The bad news come when I want to use the CPU, and I uncomment the first line of
the program. I get the following message:
clang++ -std=c++11 -I/usr/local/viennacl/include -framework OpenCL
vienna-main.cpp -o main
./main
ViennaCL: FATAL ERROR: Kernel start failed for '_norm_2_0'.
ViennaCL: Smaller work sizes could not solve the problem.
libc++abi.dylib: terminating with uncaught exception of type
viennacl::ocl::invalid_work_group_size: ViennaCL: FATAL ERROR:
CL_INVALID_WORK_GROUP_SIZE
The supplied work group size is invalid. If you have set this value manually,
please reconsider your choice.
If you think that this is a bug in ViennaCL, please report it at
viennacl-support@lists.sourceforge.net and supply at least the following
information:
* Operating System
* Which OpenCL implementation (AMD, NVIDIA, etc.)
* ViennaCL version
Many thanks in advance!
Abort trap: 6
Is there something I have not done correctly ?
François Fayard
Founder & Consultant - Inside Loop
Tel: +33 (0)6 01 44 06 93 <tel:+33%206%2001%2044%2006%2093>
Web: www.insideloop.io <http://www.insideloop.io/>
Twitter: @insideloop_io
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