:orphan:
# KSPHPDDMPrecision
Precision of Krylov bases used by `KSPHPDDM` 
## Synopsis
```
typedef enum {
  KSP_HPDDM_PRECISION_HALF      = 0,
  KSP_HPDDM_PRECISION_SINGLE    = 1,
  KSP_HPDDM_PRECISION_DOUBLE    = 2,
  KSP_HPDDM_PRECISION_QUADRUPLE = 3
} KSPHPDDMPrecision;
```

## Values

- ***`KSP_HPDDM_PRECISION_HALF` -*** default when PETSc is configured `--with-precision=__fp16`
- ***`KSP_HPDDM_PRECISION_SINGLE` -*** default when PETSc is configured `--with-precision=single`
- ***`KSP_HPDDM_PRECISION_DOUBLE` -*** default when PETSc is configured `--with-precision=double`
- ***`KSP_HPDDM_PRECISION_QUADRUPLE` -*** default when PETSc is configured `--with-precision=__float128`





## See Also
 [](ch_ksp), `KSP`, `KSPHPDDM`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/include/petscksp.h.html#KSPHPDDMPrecision">include/petscksp.h</A>


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