[petsc-users] Slepc Question, shell-matrix

[Jose E. Roman]

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> El 22 ago 2022, a las 22:45, feng wang <snailsoar at hotmail.com> escribió:
> 
> Hi Jose,
> 
> I think I might have solved my problem. I have some uninitialized values in my part of code to compute the right hand side. so it produces a NAN when it tries to compute the matrix-vector product. 
> 
> Many thanks for your help!
> 
> Best regards,
> Feng
> 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.
> 
> Jose
> 
> 
> > 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>