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# PCHPDDMSetSTShareSubKSP
Sets whether the `KSP` in SLEPc `ST` and the fine-level subdomain solver should be shared. 
## Synopsis
```
#include "petscpc.h" 
PetscErrorCode PCHPDDMSetSTShareSubKSP(PC pc, PetscBool share)
```

## Input Parameters

- ***pc -*** preconditioner context
- ***share -*** whether the `KSP` should be shared or not



## Note
This is not the same as `PCSetReusePreconditioner()`. Given certain conditions (visible using -info), a symbolic factorization can be skipped
when using a subdomain `PCType` such as `PCLU` or `PCCHOLESKY`.




## See Also
 `PCHPDDM`, `PCHPDDMGetSTShareSubKSP()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/pc/impls/hpddm/pchpddm.cxx.html#PCHPDDMSetSTShareSubKSP">src/ksp/pc/impls/hpddm/pchpddm.cxx</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex76.c.html">src/ksp/ksp/tutorials/ex76.c</A><BR>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/pc/impls/hpddm/pchpddm.cxx.html#PCHPDDMSetSTShareSubKSP_HPDDM">PCHPDDMSetSTShareSubKSP_HPDDM in src/ksp/pc/impls/hpddm/pchpddm.cxx</A><BR>


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


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