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# PCFieldSplitSetDMSplits
Flags whether `DMCreateFieldDecomposition()` should be used to define the splits in a `PCFIELDSPLIT`, whenever possible. 
## Synopsis
```
#include "petscpc.h" 
PetscErrorCode PCFieldSplitSetDMSplits(PC pc, PetscBool flg)
```
Logically Collective


## Input Parameters

- ***pc   -*** the preconditioner context
- ***flg  -*** boolean indicating whether to use field splits defined by the `DM`



## Options Database Key

- ***-pc_fieldsplit_dm_splits <bool> -*** use the field splits defined by the `DM`





## See Also
 [](sec_block_matrices), `PC`, `PCFIELDSPLIT`, `PCFieldSplitGetDMSplits()`, `PCFieldSplitSetFields()`, `PCFieldsplitSetIS()`

## Level
Intermediate

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


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


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