KSP_DIVERGED_INDEFINITE_PC

It appears the preconditioner is indefinite (has both positive and negative eigenvalues) and this Krylov method (KSPCG) requires it to be positive definite

Note

This can happen with the PCICC preconditioner, use the options database option -pc_factor_shift_positive_definite to force the PCICC preconditioner to generate a positive definite preconditioner

See Also

KSP: Linear System Solvers, KSPSolve(), KSPGetConvergedReason(), KSPConvergedReason, KSPSetTolerances()

Level

beginner

Location

include/petscksp.h

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Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages