[petsc-users] Trying to run https://petsc.org/release/src/ksp/ksp/tutorials/ex72.c.html

Tue Jul 30 10:56:06 CDT 2024

BDDC needs the matrix in MATIS format. Using MatConvert will give you back
the right format, but the subdomain matrices are wrong. You need to
assemble directly in MATIS format, something like

MatCreate(comm,&A)
MatSetType(A,MATIS)
MatSetLocalToGlobalMapping(A,l2gmap, l2gmap)
for e in local_elements:
   E = compute_element_matrix(e)
   MatSetValues(A,local_element_dofs,local_element_dofs,....)

l2gmap is an ISLocalToGlobalMapping that stores the global dof number of
the dofs that are local to the mesh

See e.g.
https://urldefense.us/v3/__https://gitlab.com/petsc/petsc/-/blob/main/src/ksp/ksp/tutorials/ex59.c?ref_type=heads__;!!G_uCfscf7eWS!fto0Jg_PHzGcngIMMMYrrY5g7xg9PGrrG0vYe8jDHgqRACNehCc-0TsT-Y9KPf3LYo5ETkwf2-eR5ivUvFCoJaLlQHohtvo$ 
or
https://urldefense.us/v3/__https://gitlab.com/petsc/petsc/-/blob/main/src/ksp/ksp/tutorials/ex71.c?ref_type=heads__;!!G_uCfscf7eWS!fto0Jg_PHzGcngIMMMYrrY5g7xg9PGrrG0vYe8jDHgqRACNehCc-0TsT-Y9KPf3LYo5ETkwf2-eR5ivUvFCoJaLl4pw8W7c$ 

Il giorno mar 30 lug 2024 alle ore 17:50 neil liu <liufield at gmail.com> ha
scritto:

> Hi,
> I am trying to use PCBDDC for the vector based FEM. (Complex system,
> double precision )
> My code can work well with *asm*,
> petsc-3.21.1/petsc/arch-linux-c-opt/bin/mpirun -n 8 ./app -pc_type asm
> -pc_asm_overlap 6  -ksp_converged_reason -ksp_view
> -ksp_gmres_modifiedgramschmidt  -ksp_gmres_restart 1500 -ksp_rtol 1e-8
> -ksp_monitor -ksp_max_it 100000
>
> When I tried BDDC, it was stuck for solving the linear system (it can not
> print anything for ksp_monitor). I did the conversion for matrix,
>
> *   Mat J;*
> *   MatConvert(A, MATIS, MAT_INITIAL_MATRIX, &J);*
> *   KSPSetOperators(ksp, A, J);*
> *   MatDestroy(&J);*
> *   KSPSetInitialGuessNonzero(ksp, PETSC_TRUE);*
> *   KSPSetFromOptions(ksp);*
>
> petsc-3.21.1/petsc/arch-linux-c-debug/bin/mpirun -n 2 ./app -ksp_type cg
> -pc_type bddc -ksp_monitor  -mat_type is
>
> Do you have any suggestions?
>
> Thanks ,
> Xiaodong
>
>
> On Mon, Jul 29, 2024 at 6:19 PM neil liu <liufield at gmail.com> wrote:
>
>> When I compile with real data,
>> it shows the attached error.
>>
>> The data file is in binary format, right?
>>
>>
>>
>> On Mon, Jul 29, 2024 at 5:36 PM Stefano Zampini <
>> stefano.zampini at gmail.com> wrote:
>>
>>> Your PETSc installation is for complex,  data is for real
>>>
>>> On Mon, Jul 29, 2024, 23:14 neil liu <liufield at gmail.com> wrote:
>>>
>>>> I compiled Petsc with single precision. However, it is not converged
>>>> with the data. Please see the attached file. On Mon, Jul 29, 2024 at 4: 25
>>>> PM Barry Smith <bsmith@ petsc. dev> wrote: This can happen if the data
>>>> was stored in single precision
>>>> ZjQcmQRYFpfptBannerStart
>>>> This Message Is From an External Sender
>>>> This message came from outside your organization.
>>>>
>>>> ZjQcmQRYFpfptBannerEnd
>>>> I compiled Petsc with single precision. However, it is not converged
>>>> with the data.
>>>>
>>>> Please see the attached file.
>>>>
>>>> On Mon, Jul 29, 2024 at 4:25 PM Barry Smith <bsmith at petsc.dev> wrote:
>>>>
>>>>>
>>>>>    This can happen if the data was stored in single precision and
>>>>> PETSc was built for double.
>>>>>
>>>>>
>>>>> On Jul 29, 2024, at 3:55 PM, neil liu <liufield at gmail.com> wrote:
>>>>>
>>>>> This Message Is From an External Sender
>>>>> This message came from outside your organization.
>>>>> Dear Petsc developers,,
>>>>>
>>>>> I am trying to run
>>>>> https://urldefense.us/v3/__https://petsc.org/release/src/ksp/ksp/tutorials/ex72.c.html__;!!G_uCfscf7eWS!fto0Jg_PHzGcngIMMMYrrY5g7xg9PGrrG0vYe8jDHgqRACNehCc-0TsT-Y9KPf3LYo5ETkwf2-eR5ivUvFCoJaLlfC7UbLU$ 
>>>>> <https://urldefense.us/v3/__https://petsc.org/release/src/ksp/ksp/tutorials/ex72.c.html__;!!G_uCfscf7eWS!ZG4gvmS6hQD8ymbvCUDfAatzRUJHzmWO-hOgp9m0xXuAXgIB-fxe_xspYs3WEPi_Ed0UFLMHKanYuYWrTlQGrA$>
>>>>> with
>>>>>
>>>>> petsc-3.21.1/petsc/arch-linux-c-opt/bin/mpirun -n 2 ./ex72  -f
>>>>> /Documents/PetscData/poisson_DMPLEX_32x32_16.dat -pc_type bddc -ksp_type cg
>>>>> -ksp_norm_type natural -ksp_error_if_not_converged -mat_type is
>>>>>
>>>>> The file was downloaded and put in the directory PetscData.
>>>>>
>>>>> The error is shown as follows,
>>>>>
>>>>> 0]PETSC ERROR: --------------------- Error Message
>>>>> --------------------------------------------------------------
>>>>> [0]PETSC ERROR: Read from file failed
>>>>> [0]PETSC ERROR: Read past end of file
>>>>> [0]PETSC ERROR: WARNING! There are unused option(s) set! Could be the
>>>>> program crashed before usage or a spelling mistake, etc!
>>>>> [0]PETSC ERROR:   Option left: name:-ksp_error_if_not_converged (no
>>>>> value) source: command line
>>>>> [0]PETSC ERROR:   Option left: name:-ksp_norm_type value: natural
>>>>> source: command line
>>>>> [0]PETSC ERROR:   Option left: name:-ksp_type value: cg source:
>>>>> command line
>>>>> [0]PETSC ERROR:   Option left: name:-pc_type value: bddc source:
>>>>> command line
>>>>> [0]PETSC ERROR: See https://urldefense.us/v3/__https://petsc.org/release/faq/__;!!G_uCfscf7eWS!fto0Jg_PHzGcngIMMMYrrY5g7xg9PGrrG0vYe8jDHgqRACNehCc-0TsT-Y9KPf3LYo5ETkwf2-eR5ivUvFCoJaLlnbED1k0$ 
>>>>> <https://urldefense.us/v3/__https://petsc.org/release/faq/__;!!G_uCfscf7eWS!ZG4gvmS6hQD8ymbvCUDfAatzRUJHzmWO-hOgp9m0xXuAXgIB-fxe_xspYs3WEPi_Ed0UFLMHKanYuYVR0x14Xg$>
>>>>>  for trouble shooting.
>>>>> [0]PETSC ERROR: Petsc Release Version 3.21.1, unknown
>>>>> [0]PETSC ERROR: ./ex72 on a arch-linux-c-opt named
>>>>>  Mon Jul 29 15:50:04 2024
>>>>> [0]PETSC ERROR: Configure options --with-cc=gcc --with-fc=gfortran
>>>>> --with-cxx=g++ --download-fblaslapack --download-mpich
>>>>> --with-scalar-type=complex --download-triangle --with-debugging=no
>>>>> [0]PETSC ERROR: #1 PetscBinaryRead() at
>>>>> /home/xxxxxx/Documents/petsc-3.21.1/petsc/src/sys/fileio/sysio.c:327
>>>>> [0]PETSC ERROR: #2 PetscViewerBinaryWriteReadAll() at
>>>>> /home/xiaodong.liu/Documents/petsc-3.21.1/petsc/src/sys/classes/viewer/impls/binary/binv.c:1077
>>>>> [0]PETSC ERROR: #3 PetscViewerBinaryReadAll() at
>>>>> /home/xiaodong.liu/Documents/petsc-3.21.1/petsc/src/sys/classes/viewer/impls/binary/binv.c:1119
>>>>> [0]PETSC ERROR: #4 MatLoad_MPIAIJ_Binary() at
>>>>> Documents/petsc-3.21.1/petsc/src/mat/impls/aij/mpi/mpiaij.c:3093
>>>>> [0]PETSC ERROR: #5 MatLoad_MPIAIJ() at
>>>>> /Documents/petsc-3.21.1/petsc/src/mat/impls/aij/mpi/mpiaij.c:3035
>>>>> [0]PETSC ERROR: #6 MatLoad() at
>>>>> /Documents/petsc-3.21.1/petsc/src/mat/interface/matrix.c:1344
>>>>> [0]PETSC ERROR: #7 MatLoad_IS() at
>>>>> /Documents/petsc-3.21.1/petsc/src/mat/impls/is/matis.c:2575
>>>>> [0]PETSC ERROR: #8 MatLoad() at
>>>>> /home/Documents/petsc-3.21.1/petsc/src/mat/interface/matrix.c:1344
>>>>> [0]PETSC ERROR: #9 main() at ex72.c:105
>>>>> [0]PETSC ERROR: PETSc Option Table entries:
>>>>> [0]PETSC ERROR: -f
>>>>> /Documents/PetscData/poisson_DMPLEX_32x32_16.dat (source: command line)
>>>>> [0]PETSC ERROR: -ksp_error_if_not_converged (source: command line)
>>>>> [0]PETSC ERROR: -ksp_norm_type natural (source: command line)
>>>>> [0]PETSC ERROR: -ksp_type cg (source: command line)
>>>>> [0]PETSC ERROR: -mat_type is (source: command line)
>>>>> [0]PETSC ERROR: -pc_type bddc (source: command line)
>>>>> [0]PETSC ERROR: ----------------End of Error Message -------send
>>>>> entire error message to petsc-maint at mcs.anl.gov----------
>>>>> application called MPI_Abort(MPI_COMM_SELF, 66) - process 0
>>>>>
>>>>>
>>>>>

-- 
Stefano
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