PetscErrorCode FllopSetFromOptions()
| -fllop_object_info | - print one-line info messages about matrices and vectors | |
| -fllop_dump | - dump matrix data used by FLLOP | |
| -fllop_trace | - trace crucial FLLOP functions | |
| -fllop_debug | - enable FLLOP debug messages | |
| -fllop_info | - enable info messages only from FLLOP |