# SNESFASSetNumberSmoothDown
Sets the number of pre-smoothing steps to use on all levels. 
## Synopsis
```
#include "petscsnes.h"  
PetscErrorCode SNESFASSetNumberSmoothDown(SNES snes, PetscInt n)
```
Logically Collective


## Input Parameters

- ***snes -*** the `SNESFAS` nonlinear multigrid context
- ***n    -*** the number of smoothing steps



## Options Database Key

- ***-snes_fas_smoothdown <n> -*** Sets number of pre-smoothing steps





## See Also
 `SNESFAS`, `SNESFASSetNumberSmoothUp()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/impls/fas/fasfunc.c.html#SNESFASSetNumberSmoothDown">src/snes/impls/fas/fasfunc.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/snes/impls/fas/fasfunc.c)


[Index of all SNESFAS routines](index.md)  
[Table of Contents for all manual pages](/docs/manualpages/index.md)  
[Index of all manual pages](/docs/manualpages/singleindex.md)  
