Hello PETSc developpers, I have been using SLEPc and PETSc for solving my sparse systems for a small time now, and have been very satisfied with everything.
However, I have been running into an error lately, and I have been unable to find any online resource that talks about this specific error. I use SLEPc to find all the eigenvalues of certain tridiagonal and symmetric matrices. I set the solver to find all the eigenvalues in a large interval ([0;10] for example) using the spectrum splicing technique. I use MUMPS because I would like to perform this calculation in parallel later on, but for now I am doing it sequentially. While the solver works very well for small enough matrices (n=2000), when I increase the matrix size to around 10000, I get this error that I do not really understand: [0]PETSC ERROR: First shift renders no information Could someone please enlighten me as to what this error means? I don't know if it's relevant but I am using older version of PETSc (3.8.4) and SLEPc (3.8.2). I apologize in advance if this question has been answered somewhere already. Thank you very much, Sincerely, Desforges Perceval
