We recently updated our installation of PETSC and SLEPC from an older version, and eigenvalue problems converging in the previous installation is not converging anymore (diagonalization never comes to an end). On using -info, the following message keeps repeating during diagonalization:
[0] PCSetUp(): Leaving PC with identical preconditioner since operator is unchanged [0] STMatSolve(): Linear solve iterations=1 [0] PCSetUp(): Leaving PC with identical preconditioner since operator is unchanged [0] STMatSolve(): Linear solve iterations=1 [0] BV_SafeSqrt(): Zero norm, either the vector is zero or a semi-inner product is being used [0] PCSetUp(): Leaving PC with identical preconditioner since operator is unchanged [0] STMatSolve(): Linear solve iterations=1 [0] PCSetUp(): Leaving PC with identical preconditioner since operator is unchanged [0] STMatSolve(): Linear solve iterations=1 As can be seen, iteration number remains 1. The issue gets resolved with a smaller sized matrix. Currently I am using a 10648 x 10648 matrix, and PETSC is configured for complex values. What changes do I have to make to make my codes work in the new installation? This seems to be a version specific issue. Thanks, Sidd WPI
