[petsc-users] eps_target malloc issue

[jifeng zhao]

Hello Hong,

I just want to check with you if there is any updates on why the code
crashes under -sbaij?

At the meanwhile, unfortunately PETSC-3.5 hasn't been installed on my
server due to some technical problems. I hope technicians can get it done
as soon as possible. I will update you when I have any new results. Thanks
so much.

Best regards,
Jifeng


On Wed, Jul 30, 2014 at 2:53 PM, jifeng zhao <
jifengzhao2015 at u.northwestern.edu> wrote:

> Hello Hong,
>
> Thanks a lot. The result makes sense, but I think I will need higher
> accuracy (smaller tolerance). I will take a try myself at the meanwhile.
>
> Best regards,
> Jifeng Zhao
>
>
> On Wed, Jul 30, 2014 at 1:16 PM, hong at aspiritech.org <hong at aspiritech.org>
> wrote:
>
>> 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
>> >
>>
>
>
>
> --
> Jifeng Zhao
> PhD candidate at Northwestern University, US
> Theoretical and Applied Mechanics Program
>



-- 
Jifeng Zhao
PhD candidate at Northwestern University, US
Theoretical and Applied Mechanics Program
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