[petsc-dev] SLEPc failure

[Jose E. Roman]

The two matrices are the same ...

> El 28 oct 2017, a las 13:11, Franck Houssen <franck.houssen at inria.fr> escribió:
> 
> I just added that before EPSSetOperators:
> PetscViewer viewerA; PetscViewerBinaryOpen(PETSC_COMM_WORLD,"Atau.out",FILE_MODE_WRITE,&viewerA); MatView(A,viewerA);
> PetscViewer viewerB; PetscViewerBinaryOpen(PETSC_COMM_WORLD,"Btau.out",FILE_MODE_WRITE,&viewerB); MatView(B,viewerB);
> 
> At first, I avoided binary as I didn't know if the format handles big/little endianness... So I prefered ASCII.
> 
> Binary data are attached.
> 
> Franck
> 
> PS : running debian with little endian.
>>> python -c "import sys;print(0 if sys.byteorder=='big' else 1)"
> 1
> 
> 
> ----- Mail original -----
>> De: "Jose E. Roman" <jroman at dsic.upv.es>
>> À: "Franck Houssen" <franck.houssen at inria.fr>
>> Cc: "For users of the development version of PETSc" <petsc-dev at mcs.anl.gov>
>> Envoyé: Vendredi 27 Octobre 2017 18:52:56
>> Objet: Re: [petsc-dev] SLEPc failure
>> 
>> I cannot load the files you sent. Please send the matrices in binary format.
>> The easiest way is to run your program with -eps_view_mat0 binary:Atau.bin
>> -eps_view_mat1 binary:Btau.bin
>> 
>> However, the files are written at the end of EPSSolve() so if the solve fails
>> then it will not create the files. You can try running with -eps_max_it 1
>> or add code in your main program to write the matrices.
>> 
>> Jose
>> 
>> 
>>> El 27 oct 2017, a las 12:28, Franck Houssen <franck.houssen at inria.fr>
>>> escribió:
>>> 
>>> Maybe could be convenient for the users to have an option (or an EPSSetXXX)
>>> to relax that check ?
>>> Data are attached.
>>> 
>>> Franck
>>> 
>>> ----- Mail original -----
>>>> De: "Jose E. Roman" <jroman at dsic.upv.es>
>>>> À: "Franck Houssen" <franck.houssen at inria.fr>
>>>> Cc: "For users of the development version of PETSc"
>>>> <petsc-dev at mcs.anl.gov>
>>>> Envoyé: Vendredi 27 Octobre 2017 10:15:44
>>>> Objet: Re: [petsc-dev] SLEPc failure
>>>> 
>>>> There is no new option. What I mean is that from 3.7 to 3.8 we changed the
>>>> line that produces this error. But it seems that it is still failing in
>>>> your
>>>> problem. Maybe your B matrix is indefinite or not exactly symmetric. Can
>>>> you
>>>> send me the matrices?
>>>> Jose
>>>> 
>>>>> El 27 oct 2017, a las 9:57, Franck Houssen <franck.houssen at inria.fr>
>>>>> escribió:
>>>>> 
>>>>> I use the development version (bitbucket clone). How to relax the check ?
>>>>> At command line option ?
>>>>> 
>>>>> Franck
>>>>> 
>>>>> ----- Mail original -----
>>>>>> De: "Jose E. Roman" <jroman at dsic.upv.es>
>>>>>> À: "Franck Houssen" <franck.houssen at inria.fr>
>>>>>> Cc: "For users of the development version of PETSc"
>>>>>> <petsc-dev at mcs.anl.gov>
>>>>>> Envoyé: Jeudi 26 Octobre 2017 18:49:22
>>>>>> Objet: Re: [petsc-dev] SLEPc failure
>>>>>> 
>>>>>> 
>>>>>>> El 26 oct 2017, a las 18:36, Franck Houssen <franck.houssen at inria.fr>
>>>>>>> escribió:
>>>>>>> 
>>>>>>> Here is a stack I end up with when trying to solve an eigen problem
>>>>>>> (real,
>>>>>>> sym, generalized) with SLEPc. My understanding is that, during the Gram
>>>>>>> Schmidt orthogonalisation, the projection of one basis vector turns out
>>>>>>> to
>>>>>>> be null.
>>>>>>> First, is this correct ? Second, in such cases, are there some
>>>>>>> recommended
>>>>>>> "recipe" to test/try (options) to get a clue on the problem ? (I would
>>>>>>> unfortunately perfectly understand the answer could be no !... As this
>>>>>>> totally depends on A/B).
>>>>>>> 
>>>>>>> With arpack, the eigen problem is solved (so the matrix A and B I use
>>>>>>> seems
>>>>>>> to be relevant). But, when I change from arpack to
>>>>>>> krylovschur/ciss/arnoldi, I get the stack below.
>>>>>>> 
>>>>>>> Franck
>>>>>>> 
>>>>>>> [0]PETSC ERROR: #1 BV_SafeSqrt()
>>>>>>> [0]PETSC ERROR: #2 BVNorm_Private()
>>>>>>> [0]PETSC ERROR: #3 BVNormColumn()
>>>>>>> [0]PETSC ERROR: #4 BV_NormVecOrColumn()
>>>>>>> [0]PETSC ERROR: #5 BVOrthogonalizeCGS1()
>>>>>>> [0]PETSC ERROR: #6 BVOrthogonalizeGS()
>>>>>>> [0]PETSC ERROR: #7 BVOrthonormalizeColumn()
>>>>>>> [0]PETSC ERROR: #8 EPSFullLanczos()
>>>>>>> [0]PETSC ERROR: #9 EPSSolve_KrylovSchur_Symm()
>>>>>>> [0]PETSC ERROR: #10 EPSSolve()
>>>>>> 
>>>>>> Is this with SLEPc 3.8? In SLEPc 3.8 we relaxed this check so I would
>>>>>> suggest
>>>>>> trying with it.
>>>>>> Jose
>>>>>> 
>>>>>> 
>>>> 
>>>> 
>>> <ABtau.tar.gz>
>> 
>> 
> <ABtau.tar.gz>