-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Does Petsc implement a diagonal preconditioner? The simplest I can see is Jacobi... Dominik -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) iEYEARECAAYFAks7zPoACgkQ/EBMh9bUuzL9LQCgnnIX6BiF0rYT70JjFxIZGfKB y7AAmgOH3Fbh93UEEs/UOCaX743ruDem =vUgf -----END PGP SIGNATURE-----