PCLUSetFill

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

Synopsis

int PCLUSetFill(PC pc,double fill)
Collective on PC

Input Parameters

pc - the preconditioner context
fill - amount of expected fill

Options Database Key

-pc_lu_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. Bt default PETSc uses a value of 5.0

Keywords

PC, set, factorization, direct, fill

See Also

PCILUSetFill()

Level:intermediate
Location:src/sles/pc/impls/lu/lu.c
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