[petsc-users] Using CPR with PETSC and GPU

[Renato E Poli]

Hi

We are trying to use a CPR preconditioner for a multiphase flow solver
using the fieldsplit option. It seems to work. We see a reduced number of
iterations.
However, it is not using the GPU effectively.

Is there any documentation that could help?
Is the fieldsplit+GPU supported? (v. 3.25.2)

These are the options we are using (after a bit of trial-and-error):

-ksp_type fgmres
-ksp_gmres_restart 40
-pc_fieldsplit_type multiplicative
-fieldsplit_pressure_ksp_type preonly
-fieldsplit_pressure_pc_type hypre
-fieldsplit_pressure_pc_hypre_type boomeramg
-fieldsplit_other_ksp_type gmres
-fieldsplit_other_ksp_gmres_restart 5
-fieldsplit_other_ksp_max_it 5
-fieldsplit_other_ksp_rtol 1e-1
-fieldsplit_other_pc_type bjacobi
-fieldsplit_other_sub_pc_type ilu
-fieldsplit_other_sub_pc_factor_reuse_ordering true
-fieldsplit_other_sub_pc_factor_reuse_fill true

Thank you,
Renato
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