:orphan:
# PCDeflationSetLevels
Set the maximum level of deflation nesting.
## Synopsis
```
#include "petscksp.h"
PetscErrorCode PCDeflationSetLevels(PC pc, PetscInt max)
```
Logically Collective
## Input Parameters
- ***pc -*** the preconditioner context
- ***max -*** maximum deflation level
## Options Database Key
- ***-pc_deflation_max_lvl <0> -*** maximum number of levels for multilevel deflation
## See Also
`PCDeflationSetSpaceToCompute()`, `PCDeflationSetSpace()`, `PCDEFLATION`
## Level
intermediate
## Location
src/ksp/pc/impls/deflation/deflation.c
## Implementations
PCDeflationSetLevels_Deflation in src/ksp/pc/impls/deflation/deflation.c
---
[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/ksp/pc/impls/deflation/deflation.c)
[Index of all PC routines](index.md)
[Table of Contents for all manual pages](/manualpages/index.md)
[Index of all manual pages](/manualpages/singleindex.md)