It was not possible to build or use the requested preconditioner. This is usually due to a zero pivot in a factorization. It can also result from a failure in a subpreconditioner inside a nested preconditioner such as PCFIELDSPLIT.
Run with -ksp_error_if_not_converged to stop the program when the error is detected and print an error message with details.
KSPSolve(), KSPGetConvergedReason(), KSPConvergedReason, KSPSetTolerances()
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages