PETSc version 3.17.3
A breakdown in the Krylov method was detected so the method could not continue to enlarge the Krylov space. Could be due to a singular matrix or preconditioner. In KSPHPDDM, this is also returned when some search directions within a block are colinear.
KSPSolve(), KSPGetConvergedReason(), KSPConvergedReason, KSPSetTolerances()
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages