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viennacl / viennacl-dev

Developer repository for ViennaCL. Visit http://viennacl.sourceforge.net/ for the latest releases.
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Unable to run tutorial amg #271

Open peteryim opened 5 years ago

peteryim commented 5 years ago

I tried "amg" in the tutorial but there were problems. The software worked for "CG solver" and "CG solver with AMG preconditioner, ONEPASS COARSENING, DIRECT INTERPOLATION" but failed for "CG with AMG preconditioner, AG COARSENING (PMIS), AG INTERPOLATION". The output is below. Any ideas?

Peter Yim

./amg ../testdata/mat65k.mtx

           Device Info

Name: Unknown CPU Vendor: Intel(R) Corporation Type: CPU Available: 1 Max Compute Units: 8 Max Work Group Size: 8192 Global Mem Size: 32728408064 Local Mem Size: 32768 Local Mem Type: 2 Host Unified Memory: 1

Reading matrix... Reading matrix completed. -- CG solver (no preconditioner, warmup) --

Solver time: 1.58202 Relative residual: 9.60749e-09 Iterations: 453 Relative deviation from result: 1.13681e-08 -- CG with AMG preconditioner, ONEPASS COARSENING, DIRECT INTERPOLATION --

  • Setup phase (ViennaCL types)... Setup time: 0.767442
  • CG solver (ViennaCL types)... Solver time: 0.294805 Relative residual: 9.2538e-09 Iterations: 12 Relative deviation from result: 1.27865e-08 -- CG with AMG preconditioner, AG COARSENING (PMIS), AG INTERPOLATION -- amg: /home/ec2-user/viennacl-dev/viennacl/ocl/handle.hpp:195: const viennacl::ocl::context& viennacl::ocl::handle::context() const [with OCL_TYPE = _cl_mem*]: Assertion `pcontext != __null && bool("Logic error: Accessing dangling context from handle.")' failed. Aborted
skn123 commented 5 years ago

Able to get a crash from the GPU also

           Device Info

Name: Hainan Vendor: Advanced Micro Devices, Inc. Type: GPU Available: 1 Max Compute Units: 5 Max Work Group Size: 256 Global Mem Size: 2146349056 Local Mem Size: 32768 Local Mem Type: 1 Host Unified Memory: 0

Reading matrix... Reading matrix completed. -- CG solver (no preconditioner, warmup) --

Solver time: 65.5498 Relative residual: 9.54852e-09 Iterations: 1206 Relative deviation from result: 4.3179e-07 -- CG with AMG preconditioner, ONEPASS COARSENING, DIRECT INTERPOLATION --

  • Setup phase (ViennaCL types)... terminate called after throwing an instance of 'viennacl::linalg::amg_coarse_problem_too_large_exception' what(): No further coarsening possible (437 coarse points). Consider changing the strong connection threshold or increasing the coarsening cutoff.

Aborted (core dumped)