<div dir="ltr">If it helps: if I use those exact same options in serial, then no errors and the linear solve is beautiful :-) </div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Apr 17, 2023 at 4:22 PM Alexander Lindsay <<a href="mailto:alexlindsay239@gmail.com">alexlindsay239@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">I'm likely revealing a lot of ignorance, but in order to use HPDDM as a preconditioner does my system matrix (I am using the same matrix for A and P) need to be block type, e.g. baij or sbaij ? In MOOSE our default is aij and I am currently getting<div><br><div>[1]PETSC ERROR: #1 buildTwo() at /raid/lindad/moose/petsc/arch-moose/include/HPDDM_schwarz.hpp:1012<br></div><div><br></div><div>with options:</div><div><br></div><div>-pc_type hpddm -pc_hpddm_block_splitting -pc_hpddm_coarse_mat_type baij -pc_hpddm_coarse_pc_type lu -pc_hpddm_define_subdomains -pc_hpddm_levels_1_eps_gen_non_hermitian -pc_hpddm_levels_1_eps_nev 50 -pc_hpddm_levels_1_eps_threshold 0.1 -pc_hpddm_levels_1_st_matstructure SAME -pc_hpddm_levels_1_st_share_sub_ksp -pc_hpddm_levels_1_sub_pc_factor_mat_solver_type mumps -pc_hpddm_levels_1_sub_pc_type lu</div><div><br></div><div>Alex<br></div></div></div>
</blockquote></div>