[petsc-users] Errors encountered with KSPsolver with MATNEST and VECNEST
Junchao Zhang
junchao.zhang at gmail.com
Wed Jul 15 17:57:50 CDT 2020
Adding the MatNestSetVecType() line fixed the problem. But I don't know
why petsc had this weird design originally.
MatCreateNest(PETSC_COMM_WORLD, 3, NULL, 3, NULL, mblock,
&testMesh->system);
+ MatNestSetVecType(testMesh->system,VECNEST);
--Junchao Zhang
On Wed, Jul 15, 2020 at 2:16 PM Karl Yang <y.juntao at hotmail.com> wrote:
> Hi, Barry,
>
> I created a minimum example to reproduce the error. The example code is
> attached.
>
> Mat Object: 1 MPI processes
> type: nest
> Matrix object:
> type=nest, rows=3, cols=3
> MatNest structure:
> (0,0) : type=seqaij, rows=5, cols=5
> (0,1) : NULL
> (0,2) : type=seqaij, rows=5, cols=5
> (1,0) : NULL
> (1,1) : type=seqaij, rows=5, cols=5
> (1,2) : type=seqaij, rows=5, cols=5
> (2,0) : type=seqaij, rows=5, cols=5
> (2,1) : type=seqaij, rows=5, cols=5
> (2,2) : NULL
> Vec Object: 1 MPI processes
> type: nest
> VecNest, rows=3, structure:
> (0) : type=seq, rows=5
> Vec Object: 1 MPI processes
> type: seq
> 1.
> 1.
> 1.
> 1.
> 1.
> (1) : type=seq, rows=5
> Vec Object: 1 MPI processes
> type: seq
> 1.
> 1.
> 1.
> 1.
> 1.
> (2) : type=seq, rows=5
> Vec Object: 1 MPI processes
> type: seq
> 1.
> 1.
> 1.
> 1.
> 1.
> [0]PETSC ERROR: --------------------- Error Message
> --------------------------------------------------------------
> [0]PETSC ERROR: Invalid argument
> [0]PETSC ERROR: Nest vector argument 2 not setup.
> [0]PETSC ERROR: See https://www.mcs.anl.gov/petsc/documentation/faq.html
> for trouble shooting.
> [0]PETSC ERROR: Petsc Release Version 3.12.5, Mar, 29, 2020
> [0]PETSC ERROR: ./testSolve on a arch-linux2-c-debug named f601294ac804 by
> Unknown Thu Jul 16 03:11:02 2020
> [0]PETSC ERROR: Configure options --with-cc=gcc --with-cxx=g++
> --with-fc=gfortran --download-mpich --download-fblaslapack --with-cuda
> [0]PETSC ERROR: #1 VecCopy_Nest() line 68 in
> /usr/local/petsc/petsc-3.12.5/src/vec/vec/impls/nest/vecnest.c
> [0]PETSC ERROR: #2 VecCopy() line 1577 in
> /usr/local/petsc/petsc-3.12.5/src/vec/vec/interface/vector.c
> [0]PETSC ERROR: #3 KSPInitialResidual() line 61 in
> /usr/local/petsc/petsc-3.12.5/src/ksp/ksp/interface/itres.c
> [0]PETSC ERROR: #4 KSPSolve_GMRES() line 236 in
> /usr/local/petsc/petsc-3.12.5/src/ksp/ksp/impls/gmres/gmres.c
> [0]PETSC ERROR: #5 KSPSolve() line 760 in
> /usr/local/petsc/petsc-3.12.5/src/ksp/ksp/interface/itfunc.c
> On Jul 16 2020, at 2:39 am, Barry Smith <bsmith at petsc.dev> wrote:
>
>
> Could be a bug in PETSc, please send a sample program that produces the
> problem.
>
> Barry
>
>
> On Jul 15, 2020, at 1:28 PM, Karl Yang <y.juntao at hotmail.com
> <https://link.getmailspring.com/link/060AB2C3-F3D7-408C-99CF-C4D1B27DD59F@getmailspring.com/0?redirect=mailto%3Ay.juntao%40hotmail.com&recipient=cGV0c2MtdXNlcnNAbWNzLmFubC5nb3Y%3D>>
> wrote:
>
> Hi, Barry,
>
> Thanks for your reply. I output the matrix and vec with matview and
> vecview. And I think I do have the values set as it has been shown.
>
> Mat Object: 1 MPI processes
> type: nest
> Matrix object:
> type=nest, rows=3, cols=3
> MatNest structure:
> (0,0) : type=seqaij, rows=25, cols=25
> (0,1) : NULL
> (0,2) : type=seqaij, rows=25, cols=25
> (1,0) : NULL
> (1,1) : type=seqaij, rows=25, cols=25
> (1,2) : type=seqaij, rows=25, cols=25
> (2,0) : type=seqaij, rows=25, cols=25
> (2,1) : type=seqaij, rows=25, cols=25
> (2,2) : NULL
> Vec Object: 1 MPI processes
> type: nest
> VecNest, rows=3, structure:
> (0) : type=seq, rows=25
> Vec Object: 1 MPI processes
> type: seq
> 0.
> 0.
> 0.
> 0.
> 0.
> 0.
> 75.8279
> -51.0776
> -75.8279
> 0.
> 0.
> -90.8404
> 58.7011
> 90.8404
> 0.
> 0.
> -75.8279
> 51.0776
> 75.8279
> 0.
> 0.
> 0.
> 0.
> 0.
> 0.
> (1) : name="Vec_0x84000000_0", type=seq, rows=25
> Vec Object: Vec_0x84000000_0 1 MPI processes
> type: seq
> 0.
> 0.
> 0.
> 0.
> 0.
> 0.
> 75.8279
> -51.0776
> -75.8279
> 0.
> 0.
> -90.8404
> 58.7011
> 90.8404
> 0.
> 0.
> -75.8279
> 51.0776
> 75.8279
> 0.
> 0.
> 0.
> 0.
> 0.
> 0.
> (2) : type=seq, rows=25
> Vec Object: 1 MPI processes
> type: seq
> 0.
> 0.
> 0.
> 0.
> 0.
> 0.
> 0.
> 0.
> 0.
> 0.
> 0.
> 0.
> 0.
> 0.
> 0.
> 0.
> 0.
> 0.
> 0.
> 0.
> 0.
> 0.
> 0.
> 0.
> 0.
> [0]PETSC ERROR: --------------------- Error Message
> --------------------------------------------------------------
> [0]PETSC ERROR: Invalid argument
> [0]PETSC ERROR: Nest vector argument 4 not setup.
> [0]PETSC ERROR: See https://www.mcs.anl.gov/petsc/documentation/faq.html
> <https://link.getmailspring.com/link/060AB2C3-F3D7-408C-99CF-C4D1B27DD59F@getmailspring.com/1?redirect=https%3A%2F%2Fwww.mcs.anl.gov%2Fpetsc%2Fdocumentation%2Ffaq.html&recipient=cGV0c2MtdXNlcnNAbWNzLmFubC5nb3Y%3D> for
> trouble shooting.
> [0]PETSC ERROR: Petsc Release Version 3.12.5, Mar, 29, 2020
> [0]PETSC ERROR: ./testSolve on a arch-linux2-c-debug named f601294ac804 by
> Unknown Thu Jul 16 02:15:26 2020
> [0]PETSC ERROR: Configure options --with-cc=gcc --with-cxx=g++
> --with-fc=gfortran --download-mpich --download-fblaslapack --with-cuda
> [0]PETSC ERROR: #1 VecPointwiseMult_Nest() line 245 in
> /usr/local/petsc/petsc-3.12.5/src/vec/vec/impls/nest/vecnest.c
> [0]PETSC ERROR: #2 VecPointwiseMult() line 1107 in
> /usr/local/petsc/petsc-3.12.5/src/vec/vec/interface/vector.c
> [0]PETSC ERROR: #3 PCApply_Jacobi() line 272 in
> /usr/local/petsc/petsc-3.12.5/src/ksp/pc/impls/jacobi/jacobi.c
> [0]PETSC ERROR: #4 PCApply() line 444 in
> /usr/local/petsc/petsc-3.12.5/src/ksp/pc/interface/precon.c
> [0]PETSC ERROR: #5 KSP_PCApply() line 281 in
> /usr/local/petsc/petsc-3.12.5/include/petsc/private/kspimpl.h
> [0]PETSC ERROR: #6 KSPInitialResidual() line 65 in
> /usr/local/petsc/petsc-3.12.5/src/ksp/ksp/interface/itres.c
> [0]PETSC ERROR: #7 KSPSolve_GMRES() line 236 in
> /usr/local/petsc/petsc-3.12.5/src/ksp/ksp/impls/gmres/gmres.c
> [0]PETSC ERROR: #8 KSPSolve() line 760 in
> /usr/local/petsc/petsc-3.12.5/src/ksp/ksp/interface/itfunc.c
>
> On Jul 16 2020, at 2:13 am, Barry Smith <bsmith at petsc.dev
> <https://link.getmailspring.com/link/060AB2C3-F3D7-408C-99CF-C4D1B27DD59F@getmailspring.com/2?redirect=mailto%3Absmith%40petsc.dev&recipient=cGV0c2MtdXNlcnNAbWNzLmFubC5nb3Y%3D>>
> wrote:
>
>
> From the error message the second vector you are using to form the nest
> vector has not been completely created/set up. Make sure you called either
> VecCreateSeq(), VecCreateMPI() or did VecCreate(), VecSetType(), VecSetUp()
> and if it is the right hand side make sure you put numerical values in it.
>
> Barry
>
>
> On Jul 15, 2020, at 1:05 PM, Karl Yang <y.juntao at hotmail.com
> <https://link.getmailspring.com/link/060AB2C3-F3D7-408C-99CF-C4D1B27DD59F@getmailspring.com/3?redirect=https%3A%2F%2Flink.getmailspring.com%2Flink%2F540F752A-DB59-4878-9C98-B8F4B4D9FD0D%40getmailspring.com%2F0%3Fredirect%3Dmailto%253Ay.juntao%2540hotmail.com%26recipient%3DYnNtaXRoQHBldHNjLmRldg%253D%253D&recipient=cGV0c2MtdXNlcnNAbWNzLmFubC5nb3Y%3D>>
> wrote:
>
> Hello,
>
> I'm trying to solve a 2*2 block matrix system.
> I managed to form a 2*2 MatNest and a 21 VecNest. However when I try to
> make use of ksp solve, I encounter the following error. There is only one
> or two examples on MatNest and VecNest. I could not figure out what could
> be the trouble.
>
>
> [0]PETSC ERROR: --------------------- Error Message
> --------------------------------------------------------------
> [0]PETSC ERROR: Invalid argument
> [0]PETSC ERROR: Nest vector argument 2 not setup.
> [0]PETSC ERROR: See https://www.mcs.anl.gov/petsc/documentation/faq.html
> <https://link.getmailspring.com/link/060AB2C3-F3D7-408C-99CF-C4D1B27DD59F@getmailspring.com/4?redirect=https%3A%2F%2Flink.getmailspring.com%2Flink%2F540F752A-DB59-4878-9C98-B8F4B4D9FD0D%40getmailspring.com%2F1%3Fredirect%3Dhttps%253A%252F%252Fwww.mcs.anl.gov%252Fpetsc%252Fdocumentation%252Ffaq.html%26recipient%3DYnNtaXRoQHBldHNjLmRldg%253D%253D&recipient=cGV0c2MtdXNlcnNAbWNzLmFubC5nb3Y%3D> for
> trouble shooting.
> [0]PETSC ERROR: Petsc Release Version 3.12.5, Mar, 29, 2020
> [0]PETSC ERROR: ./testSolve on a arch-linux2-c-debug named f601294ac804 by
> Unknown Thu Jul 16 01:56:11 2020
> [0]PETSC ERROR: Configure options --with-cc=gcc --with-cxx=g++
> --with-fc=gfortran --download-mpich --download-fblaslapack --with-cuda
> [0]PETSC ERROR: #1 VecCopy_Nest() line 68 in
> /usr/local/petsc/petsc-3.12.5/src/vec/vec/impls/nest/vecnest.c
> [0]PETSC ERROR: #2 VecCopy() line 1577 in
> /usr/local/petsc/petsc-3.12.5/src/vec/vec/interface/vector.c
> [0]PETSC ERROR: #3 KSPInitialResidual() line 61 in
> /usr/local/petsc/petsc-3.12.5/src/ksp/ksp/interface/itres.c
> [0]PETSC ERROR: #4 KSPSolve_GMRES() line 236 in
> /usr/local/petsc/petsc-3.12.5/src/ksp/ksp/impls/gmres/gmres.c
> [0]PETSC ERROR: #5 KSPSolve() line 760 in
> /usr/local/petsc/petsc-3.12.5/src/ksp/ksp/interface/itfunc.c
>
>
> Regards
> JT
>
> [image: Sent from Mailspring]
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