[petsc-users] Slepc Question, shell-matrix

feng wang snailsoar at hotmail.com
Mon Aug 22 15:12:02 CDT 2022

Hi Jose,

Thanks for your reply.

The test cases from slepc runs with no problem. so the library should be installed correctly. I have tried valgrind, it does not show any useful information. what else could I check?

Best regards,
From: Jose E. Roman <jroman at dsic.upv.es>
Sent: 22 August 2022 19:32
To: feng wang <snailsoar at hotmail.com>
Cc: petsc-users at mcs.anl.gov <petsc-users at mcs.anl.gov>
Subject: Re: [petsc-users] Slepc Question, shell-matrix

This is very strange. This error appears when the solver employs the B-inner product, but in your case you don't have a B matrix, so you should never see that error. Try running under valgrind to see if it gives more hints.


> El 22 ago 2022, a las 20:45, feng wang <snailsoar at hotmail.com> escribió:
> Hello,
> I am new to Slepc and trying to work out the eigenvalues and eigenvectors of my Jacobian matrix. I am using a shell matrix to work out the matrix-vector product and I am using the default Krylov-schur method.
> My first attempt was not successful and I got the following errors:
> [0]PETSC ERROR: --------------------- Error Message --------------------------------------------------------------
> [0]PETSC ERROR: Missing or incorrect user input
> [0]PETSC ERROR: The inner product is not well defined: indefinite matrix
> [0]PETSC ERROR: See https://petsc.org/release/faq/ for trouble shooting.
> [0]PETSC ERROR: Petsc Release Version 3.17.4, unknown
> [0]PETSC ERROR: cfdtest on a arch-debug named ming by feng Mon Aug 22 19:21:41 2022
> [0]PETSC ERROR: Configure options --with-cc=mpicc --with-cxx=mpicxx --with-fc=0 PETSC_ARCH=arch-debug
> [0]PETSC ERROR: #1 BV_SafeSqrt() at /home/feng/cfd/slepc-3.17.1/include/slepc/private/bvimpl.h:130
> [0]PETSC ERROR: #2 BV_SquareRoot_Default() at /home/feng/cfd/slepc-3.17.1/include/slepc/private/bvimpl.h:365
> [0]PETSC ERROR: #3 BVOrthogonalizeCGS1() at /home/feng/cfd/slepc-3.17.1/src/sys/classes/bv/interface/bvorthog.c:101
> [0]PETSC ERROR: #4 BVOrthogonalizeGS() at /home/feng/cfd/slepc-3.17.1/src/sys/classes/bv/interface/bvorthog.c:177
> [0]PETSC ERROR: #5 BVOrthonormalizeColumn() at /home/feng/cfd/slepc-3.17.1/src/sys/classes/bv/interface/bvorthog.c:402
> [0]PETSC ERROR: #6 BVMatArnoldi() at /home/feng/cfd/slepc-3.17.1/src/sys/classes/bv/interface/bvkrylov.c:91
> [0]PETSC ERROR: #7 EPSSolve_KrylovSchur_Default() at /home/feng/cfd/slepc-3.17.1/src/eps/impls/krylov/krylovschur/krylovschur.c:261
> [0]PETSC ERROR: #8 EPSSolve() at /home/feng/cfd/slepc-3.17.1/src/eps/interface/epssolve.c:147
> [0]PETSC ERROR: #9 slepc_eigen_comp() at domain/cfd/slepc_eigen_solve.cpp:77
> Could someone please shine some light on this? I have also attached my code. The code is part of my big library and I cannot attach the whole code, sorry about this. but I am happy to provide more information. The attached code has some arrangements for halo exchange, but for the moment, it assumes it is a serial run.
> Many thanks,
> Feng
> <slepc_eigen_solve.cpp>

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