PETSc version 3.17.5

PCGAMGSetRankReductionFactors

Set manual schedule for process reduction on coarse grids

#include "petscpc.h" 
#include "petscksp.h" 
PetscErrorCode PCGAMGSetRankReductionFactors(PC pc, PetscInt v[], PetscInt n)

Collective on PC

	pc	- the preconditioner context
	v	- array of reduction factors. 0 for fist value forces a reduction to one process/device on first level in Cuda
	n	- number of values provided in array

-pc_gamg_rank_reduction_factors <factors>

- provide the schedule

intermediate