petsc-master 2017-01-18
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Indicate the amount of fill you expect in the factored matrix, fill = number nonzeros in factor/number nonzeros in original matrix.


#include "petscpc.h" 
PetscErrorCode  PCFactorSetFill(PC pc,PetscReal fill)
Not Collective, each process can expect a different amount of fill

Input Parameters

pc - the preconditioner context
fill - amount of expected fill

Options Database Key

-pc_factor_fill <fill> -Sets fill amount


For sparse matrix factorizations it is difficult to predict how much fill to expect. By running with the option -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

This parameter has NOTHING to do with the levels-of-fill of ILU(). That is set with PCFactorSetLevels() or -pc_factor_levels.


PC, set, factorization, direct, fill

Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages