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# MATSOLVERKLU
"klu" - A matrix type providing direct solvers, LU, for sequential matrices via the external package KLU. `./configure --download-suitesparse` to install PETSc to use KLU

Use `-pc_type lu` `-pc_factor_mat_solver_type klu` to use this direct solver

Consult KLU documentation for more information on the options database keys below.


## Options Database Keys

- ***-mat_klu_pivot_tol <0.001>                  -*** Partial pivoting tolerance
- ***-mat_klu_use_btf <1>                        -*** Use BTF preordering
- ***-mat_klu_ordering <AMD>                     -*** KLU reordering scheme to reduce fill-in (choose one of) `AMD`, `COLAMD`, `PETSC`
- ***-mat_klu_row_scale <NONE>                   -*** Matrix row scaling (choose one of) `NONE`, `SUM`, `MAX`





## Note
KLU is part of SuiteSparse http://faculty.cse.tamu.edu/davis/suitesparse.html


## See Also
 [](ch_matrices), `Mat`, `PCLU`, `MATSOLVERUMFPACK`, `MATSOLVERCHOLMOD`, `PCFactorSetMatSolverType()`, `MatSolverType`

## Level
beginner

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/impls/aij/seq/klu/klu.c.html#MATSOLVERKLU">src/mat/impls/aij/seq/klu/klu.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/mat/impls/aij/seq/klu/klu.c)


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