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# PCPARMSSetNonsymPerm
Sets the type of permutation for the ARMS preconditioner: the standard symmetric ARMS or the non-symmetric ARMS (ARMS-ddPQ). 
## Synopsis
```
#include "petscpc.h" 
PetscErrorCode PCPARMSSetNonsymPerm(PC pc, PetscBool nonsym)
```
Collective


## Input Parameters

- ***pc -*** the preconditioner context
- ***nonsym -*** `PETSC_TRUE` indicates the non-symmetric ARMS is used;
`PETSC_FALSE` indicates the symmetric ARMS is used



## Options Database Key

- ***-pc_parms_nonsymmetric_perm -*** sets the use of nonsymmetric permutation





## Note
See the pARMS function `parms_PCSetPermType()` for more information.


## See Also
 `PCPARMS`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/pc/impls/parms/parms.c.html#PCPARMSSetNonsymPerm">src/ksp/pc/impls/parms/parms.c</A>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/pc/impls/parms/parms.c.html#PCPARMSSetNonsymPerm_PARMS">PCPARMSSetNonsymPerm_PARMS in src/ksp/pc/impls/parms/parms.c</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/ksp/pc/impls/parms/parms.c)


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