[dune-pdelab] Error in testgeneo.cc

[Linus Seelinger]

Hi Aswin,

I assume you are running the test binary sequentially? The GenEO coarse space is only valid for a domain decomposition with overlaps (sequential run => no grid overlap => empty right hand side in GenEO eigenproblem => arpack failure).

You can look up the definition of tests in the corresponding CMakeLists.txt file. There you'll see that this test is intended to run on 2 MPI ranks, so
mpirun -n 2 ./testgeneo
should do the trick.

Best,

Linus
Am Montag, 27. September 2021, 13:40:18 CEST schrieb Aswin vs:
> When I try to run testgeneo.cc from the pdelab/text directory, I receive
> the following error message.
> Could someone please advise me how to solve this issue?
> 
> Arpack error in Aupp.
> -> Starting vector is zero.
> Arpack error in FindArnoldiBasis.
> -> Could not find an Arnoldi basis.
> Process 0 picked 0 eigenvectors
> Matrix setup
> Global basis size B=0
> Matrix setup finished: M=3.2284e-05
> === Dune::CGSolver
>  Iter          Defect            Rate
>     0      9.97497e+06
>     1      1.29537e-08      1.29862e-15
> Coarse time CT=7.905e-06
> Coarse time per apply CTA=7.905e-06
> Arpack error in AREigenProblem.
> -> 'n' must be greater than one.
> Arpack error in DefineParameter.
> -> Some parameters were not correctly defined.
> Arpack error in TakeStep.
> -> DefineParameters must be called prior to this function.
> Arpack error in FindArnoldiBasis.
> -> Could not find an Arnoldi basis.
> [user-OptiPlex-7080:41995] *** Process received signal ***
> [user-OptiPlex-7080:41995] Signal: Segmentation fault (11)
>