PETSc version 3.16.5
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# PetscOptionsLeft

Prints to screen any options that were set and never used.

### Synopsis

    #include "petscsys.h"
    PetscErrorCode PetscOptionsLeft(PetscOptions options)

Not Collective

### Input Parameter

| options | - options database; use NULL for default global database

### Options Database Key

| -options_left | - activates PetscOptionsAllUsed() within PetscFinalize()

### Notes

This is rarely used directly, it is called by PetscFinalize() in debug more or if -options_left is passed otherwise to help users determine possible mistakes in their usage of options. This only prints values on process zero of PETSC_COMM_WORLD. Other processes depending the objects used may have different options that are left unused.

### See Also

PetscOptionsAllUsed()

### Level

advanced

### Location

src/sys/objects/options.c
Index of all Sys routines
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Index of all manual pages