PCCholeskySetFill

Indicates the amount of fill you expect in the factored matrix, fill = number nonzeros in factor/number nonzeros in original matrix.

Synopsis

#include "petscpc.h" 
int PCCholeskySetFill(PC pc,PetscReal fill)

Collective on PC

Input Parameters

	pc	- the preconditioner context
	fill	- amount of expected fill

Options Database Key

-pc_cholesky_fill <fill> -Sets fill amount

Note

For sparse matrix factorizations it is difficult to predict how much fill to expect. By running with the option -log_info PETSc will print the actual amount of fill used; allowing you to set the value accurately for future runs. Default PETSc uses a value of 5.0

Keywords