[petsc-users] order dependency in petsc options?

[Geoffrey Irving]

I'm setting options via

    CHECK(PetscOptionsClear());
    CHECK(PetscOptionsInsert(&argc,&argv,0));

a while after calling PetscInitialize().  If the options are

    -ksp_rtol 1e-3 -pc_factor_mat_ordering_type nd -ksp_type cg
-pc_type icc -pc_factor_levels 0 -ksp_max_it 100

it successfully caps CG iterations at 100.  If I use

    -ksp_max_it 100 -ksp_rtol 1e-3 -pc_factor_mat_ordering_type nd
-ksp_type cg -pc_type icc -pc_factor_levels 0

the maximum iterations are 10000.  I.e., -ksp_max_it work at the end
but not at the beginning.  What might be causing this order
dependence?  I'm using

    [0]PETSC ERROR: Petsc Release Version 3.3.0, Patch 3, Wed Aug 29
11:26:24 CDT 2012

Thanks,
Geoffrey