[petsc-users] RCM for ILU?

Barry Smith bsmith at mcs.anl.gov
Fri Feb 14 10:19:35 CST 2014

  -pc_type ilu -pc_factor_mat_ordering_type rcm

  But don’t get your hopes up to high, in our experience if you have any reasonable ordering of your underlying mesh/grid these orderings don’t generally help ILU much.


On Feb 14, 2014, at 10:13 AM, Qin Lu <lu_qin_2000 at yahoo.com> wrote:

> Hello,
> Is the RCM reordering available for ILU preconditioner in PETSc? The manual says RCM works with LU factorization, but it does not mention it for preconditioners.
> If not, is there any reordering method working for ILU in PETSc, or the users have to do the work outside PETSc?
> Thanks a lot for your information.
> Qin

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