[petsc-users] 3.5 -> 3.6 Change in MatOrdering Behavior

[Paul T. Bauman]

On Thu, Jan 21, 2016 at 12:51 PM, Hong <hzhang at mcs.anl.gov> wrote:

> Paul:
> It might be caused by our changes in default shift strategy.
> We previously used '-pc_factor_shift_type NONZERO' for ilu, then changed
> to '-pc_factor_shift_type NONE'.
> For your test, I get
> ./ex10 -f0 test.mat -rhs 0 -pc_type asm -pc_asm_overlap 12 -sub_pc_type
> ilu -sub_pc_factor_mat_ordering_type 1wd -sub_pc_factor_levels 4
> -ksp_converged_reason -sub_pc_factor_shift_type NONZERO
>

Ah! That was the change. Confirmed, adding -sub_pc_factor_shift_type
nonzero gets our test passing again with those options. Mystery solved.
Thank you very much.

Best,

Paul
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