Matthew Knepley <[email protected]> writes: > It looks like you are running in parallel (never do this until everything > works in serial), which probably means you are using > PCREDUNDANT for the coarse PC, so you need what Jed suggested: > > -mg_coarse_sub_pc_type svd
GAMG uses block Jacobi by default, not redundant. If it was redundant, you would use -mg_coarse_redundant_pc_type svd.
