PETSC ERROR: KSPSolve() has not converged, reason DIVERGED_ITS

Hello, I have a question about subduction-3d. When using the command “pylith step04_eqcycle.cfg mat_viscoelastic.cfg” runs pylith correctly, but when I add “–node=n” and “n > 2”, an error occurs.

This is a known and documented issue when running in parallel with the default preconditioner for elasticity with faults. Please refer to the boxes with warnings in the PETSc Options section of the manual for a discussion of the default preconditioner and when it fails in parallel.

Thank you very much for your help. I have solved the problem based on the manual. :smiley: