:orphan:
# PCType
String with the name of a PETSc preconditioner 
## Synopsis
```
typedef const char *PCType;
#define PCNONE               "none"
#define PCJACOBI             "jacobi"
#define PCSOR                "sor"
#define PCLU                 "lu"
#define PCQR                 "qr"
#define PCSHELL              "shell"
#define PCAMGX               "amgx"
#define PCBJACOBI            "bjacobi"
#define PCMG                 "mg"
#define PCEISENSTAT          "eisenstat"
#define PCILU                "ilu"
#define PCICC                "icc"
#define PCASM                "asm"
#define PCGASM               "gasm"
#define PCKSP                "ksp"
#define PCBJKOKKOS           "bjkokkos"
#define PCCOMPOSITE          "composite"
#define PCREDUNDANT          "redundant"
#define PCSPAI               "spai"
#define PCNN                 "nn"
#define PCCHOLESKY           "cholesky"
#define PCPBJACOBI           "pbjacobi"
#define PCVPBJACOBI          "vpbjacobi"
#define PCMAT                "mat"
#define PCHYPRE              "hypre"
#define PCPARMS              "parms"
#define PCFIELDSPLIT         "fieldsplit"
#define PCTFS                "tfs"
#define PCML                 "ml"
#define PCGALERKIN           "galerkin"
#define PCEXOTIC             "exotic"
#define PCCP                 "cp"
#define PCBFBT               "bfbt"
#define PCLSC                "lsc"
#define PCPYTHON             "python"
#define PCPFMG               "pfmg"
#define PCSMG                "smg"
#define PCSYSPFMG            "syspfmg"
#define PCREDISTRIBUTE       "redistribute"
#define PCSVD                "svd"
#define PCGAMG               "gamg"
#define PCCHOWILUVIENNACL    "chowiluviennacl"
#define PCROWSCALINGVIENNACL "rowscalingviennacl"
#define PCSAVIENNACL         "saviennacl"
#define PCBDDC               "bddc"
#define PCKACZMARZ           "kaczmarz"
#define PCTELESCOPE          "telescope"
#define PCPATCH              "patch"
#define PCLMVM               "lmvm"
#define PCHMG                "hmg"
#define PCDEFLATION          "deflation"
#define PCHPDDM              "hpddm"
#define PCH2OPUS             "h2opus"
#define PCMPI                "mpi"

```



## Note
`PCRegister()` is used to register preconditioners that are then accessible via `PCSetType()`


## See Also
 [](doc_linsolve), [](sec_pc), `PCSetType()`, `PC`, `PCCreate()`, `PCRegister()`, `PCSetFromOptions()`, `PCLU`, `PCJACOBI`, `PCBJACOBI`

## Level
beginner

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/include/petscpctypes.h.html#PCType">include/petscpctypes.h</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/include/petscpctypes.h)


[Index of all PC routines](index.md)  
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