[petsc-users] parallel sor

[Xiangdong]

Hello everyone,

As in the note of PCSOR, it corresponds to block Jacobi with SOR on each
block, not a true parallel SOR.

1) Is there a parallel sor implemented in PETSc, like the red-black Gauss
Seidel?

2) If it is not a true parallel SOR, then what is the difference between
options  -pc_sor_forward and -pc_sor_local_forward? It seems that
pc_sor_forward does not work for mpiaij format. When is pc_sor_forward used?

Thanks.

Xiangdong
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