| -pc_mg_levels <nlevels> | - number of levels including finest | |
| -pc_mg_cycles v or w | - . -pc_mg_smoothup <n> - number of smoothing steps after interpolation | |
| -pc_mg_smoothdown <n> | - number of smoothing steps before applying restriction operator | |
| -pc_mg_type <additive,multiplicative,full,cascade> | - multiplicative is the default | |
| -pc_mg_log | - log information about time spent on each level of the solver | |
| -pc_mg_monitor | - print information on the multigrid convergence | |
| -pc_mg_galerkin | - use Galerkin process to compute coarser operators, i.e. Acoarse = R A R' | |
| -pc_mg_multiplicative_cycles | - number of cycles to use as the preconditioner (defaults to 1) | |
| -pc_mg_dump_matlab | - dumps the matrices for each level and the restriction/interpolation matrices to the Socket viewer for reading from MATLAB. | |
| -pc_mg_dump_binary | - dumps the matrices for each level and the restriction/interpolation matrices to the binary output file called binaryoutput |
Notes: By default this uses GMRES on the fine grid smoother so this should be used with KSPFGMRES or the smoother changed to not use GMRES
When run with a single level the smoother options are used on that level NOT the coarse grid solver options
Level:intermediate
Location:src/ksp/pc/impls/mg/mg.c
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages