[petsc-users] eps_target malloc issue

[hong at aspiritech.org]

Jifeng,
Using petsc-3.5 and slepc-3.5 (maint branch), I tested your matrices

mpiexec -n 32 ./ex7 -f1 $data/zhao/petsc_stiff20.dat -f2
$data/zhao/petsc_mass20.dat -mat_view ascii::ascii_info -mat_type aij
-eps_gen_hermitian -eps_type krylovschur -eps_target -0.1 -st_ksp_type
minres -st_pc_type bjacobi -st_sub_pc_type icc -st_ksp_rtol 1.e-2
-eps_tol 1.e-2 -eps_nev 40 -st_type sinvert -log_summary |& tee
log.mat20.ex7.np32.tol-2

The output is attached.

When using '-mat_type sbaij', I got same error as reported, which
might be a bug in our libraries. I'll investigate it.
Switching to '-mat_type aij' works (I'm not sure if the computed
eigenvalues are meaningful though), but the linear solver
minres/bjacobi/icc converges very slow, takes around 500 - 1000 linear
iterations for each eps iteration. You may experiment with stronger
pc_type, e.g., '-pc_type asm' etc.

I'll let you know why sbaij crashes.

Hong

On Mon, Jul 28, 2014 at 4:52 PM, Jose E. Roman <jroman at dsic.upv.es> wrote:
>
> El 28/07/2014, a las 23:48, jifeng zhao escribió:
>
>> Hi Barry,
>>
>> Thanks for the reply. I see. I am still testing it and looking for the bug.
>>
>> It is pretty weird that the error appears, since the code I am running is ex7 and I didn't change anything.
>>
>> My matrices are assembled in binary files separately. As I explained earlier, I have a series of matrices to solve, each of them have the same patterns but with different values. The way I assembly the matrix has proven to be correct for all the other cases. Only for this one, when the matrix has an zero eigenvalue, ex7 failed to solve it.
>>
>> In fact, I don't understand why this "Out of range" error could possibly appear? 1. my matrices have the correct parrellel lay up. 2. In ex7, I am not explicitly accessing to any elements at all! All I did is EPSSolve();
>>
>> Any ideas?
>>
>> Best regards,
>> Jifeng Zhao
>>
>
> Tomorrow we will release slepc-3.5. I would suggest trying with the new version. If the problem persist we can help to track down the problem.
>
> Jose
>
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