PETSc version 3.15.5

PCGAMGSetRepartition

Repartition the degrees of freedom across the processors on the coarser grids

#include "petscpc.h" 
#include "petscksp.h" 
PetscErrorCode PCGAMGSetRepartition(PC pc, PetscBool n)

Collective on PC

	pc	- the preconditioner context
	n	- PETSC_TRUE or PETSC_FALSE

-pc_gamg_repartition <true,false>

this will generally improve the loading balancing of the work on each level

intermediate