# MATSBAIJSPOOLES

MATSBAIJSPOOLES = "sbaijspooles" - A matrix type providing direct solvers (Cholesky) for sequential and parallel symmetric matrices via the external package Spooles. If Spooles is installed (see the manual for instructions on how to declare the existence of external packages), a matrix type can be constructed which invokes Spooles solvers. After calling MatCreate(...,A), simply call MatSetType(A,MATSBAIJSPOOLES).

This matrix inherits from MATSBAIJ. As a result, MatSeqSBAIJSetPreallocation and MatMPISBAIJSetPreallocation are supported for this matrix type. One can also call MatConvert for an inplace conversion to or from the MATSBAIJ type without data copy.

### Options Database Keys

| -mat_type sbaijspooles | - sets the matrix type to sbaijspooles during calls to MatSetFromOptions()
| -mat_spooles_tau <tau> | - upper bound on the magnitude of the largest element in L or U
| -mat_spooles_seed <seed> | - random number seed used for ordering
| -mat_spooles_msglvl <msglvl> | - message output level
| -mat_spooles_ordering <BestOfNDandMS,MMD,MS,ND> | - ordering used
| -mat_spooles_maxdomainsize <n> | - maximum subgraph size used by Spooles orderings
| -mat_spooles_maxzeros <n> | - maximum number of zeros inside a supernode
| -mat_spooles_maxsize <n> | - maximum size of a supernode
| -mat_spooles_FrontMtxInfo <true,fase> | - print Spooles information about the computed factorization
| -mat_spooles_symmetryflag <0,1,2> | - 0: SPOOLES_SYMMETRIC, 1: SPOOLES_HERMITIAN, 2: SPOOLES_NONSYMMETRIC
| -mat_spooles_patchAndGoFlag <0,1,2> | - 0: no patch, 1: use PatchAndGo strategy 1, 2: use PatchAndGo strategy 2
| -mat_spooles_toosmall <dt> | - drop tolerance for PatchAndGo strategy 1
| -mat_spooles_storeids <bool integer> | - if nonzero, stores row and col numbers where patches were applied in an IV object
| -mat_spooles_fudge <delta> | - fudge factor for rescaling diagonals with PatchAndGo strategy 2
| -mat_spooles_storevalues <bool integer> | - if nonzero and PatchAndGo strategy 2 is used, store change in diagonal value in a DV object

### See Also

MATMPISBAIJSPOOLES, MATSEQAIJSPOOLES, MATMPIAIJSPOOLES, PCCHOLESKY

Level:beginner
Location:src/mat/impls/sbaij/seq/spooles/sbaijspooles.c
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