I was thinking about interpreting the "BoomerAMG SOLVER PARAMETERS:" stuff (eg, what is the closest thing to SSOR that Parv wants). That does not look like our code, but maybe it is.
On Sat, Jan 6, 2024 at 12:50 PM Pierre Jolivet <pie...@joliv.et> wrote: > > > On 6 Jan 2024, at 3:15 PM, Mark Adams <mfad...@lbl.gov> wrote: > > Does this work for you? > > -pc_hypre_boomeramg_grid_sweeps_all 2 > > The comment in our code says SSOR is the default but it looks like it is > really "hSGS" > > I thought it was an L1 Jacobi, but you would want to ask Hypre about this. > > HYPRE’s default settings are not the same as the ones we set in PETSc as > default, so do not ask HYPRE people (about this particular issue). > > Thanks, > Pierre > > Mark > > > > On Fri, Jan 5, 2024 at 10:21 AM Barry Smith <bsm...@petsc.dev> wrote: > >> >> Yes, the handling of BoomerAMG options starts at line 365. If we don't >> support what you want but hypre has a function call that allows one to set >> the values then the option could easily be added to the PETSc options >> database here either by you (with a merge request) or us. So I would say >> check the hypre docs. >> >> Just let us know what BoomerAMG function is missing from the code. >> >> Barry >> >> >> On Jan 5, 2024, at 7:52 AM, Khurana, Parv <p.khuran...@imperial.ac.uk> >> wrote: >> >> Hello PETSc users community, >> >> Happy new year! Thank you for the community support as always. >> >> I am using BoomerAMG for my research, and it is interfaced to my software >> via PETSc. I can only use options database keys as of now to tweak the >> settings I want for the AMG solve. >> >> I want to control the number of smoothener iterations at pre/post step >> for a given AMG cycle. I am looking for an options database key which helps >> me control this. I am not sure whether this is possible directly via the >> keys (Line 365: >> https://www.mcs.anl.gov/petsc/petsc-3.5.4/src/ksp/pc/impls/hypre/hypre.c.html). >> My comprehension of the current setup is that I have 1 smoothener iteration >> at every coarsening step. My aim is to do two pre and 2 post smoothening >> steps using the SSOR smoothener. >> >> BoomerAMG SOLVER PARAMETERS: >> >> Maximum number of cycles: 1 >> Stopping Tolerance: 0.000000e+00 >> Cycle type (1 = V, 2 = W, etc.): 1 >> >> Relaxation Parameters: >> Visiting Grid: down up coarse >> Number of sweeps: 1 1 1 >> Type 0=Jac, 3=hGS, 6=hSGS, 9=GE: 6 6 9 >> Point types, partial sweeps (1=C, -1=F): >> Pre-CG relaxation (down): 1 -1 >> Post-CG relaxation (up): -1 1 >> Coarsest grid: 0 >> >> PETSC settings I am using currently: >> >> -ksp_type preonly >> -pc_type hypre >> -pc_hypre_type boomeramg >> -pc_hypre_boomeramg_coarsen_type hmis >> -pc_hypre_boomeramg_relax_type_all symmetric-sor/jacobi >> -pc_hypre_boomeramg_strong_threshold 0.7 >> -pc_hypre_boomeramg_interp_type ext+i >> -pc_hypre_boomeramg_P_max 2 >> -pc_hypre_boomeramg_truncfactor 0.3 >> >> Thanks and Best >> Parv Khurana >> >> >> >
