petsc-3.7.7 2017-09-25
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# MATSOLVERCHOLMOD

"cholmod" - A matrix type providing direct solvers (Cholesky) for sequential matrices via the external package CHOLMOD. Use ./configure --download-suitesparse to install PETSc to use CHOLMOD

Use -pc_type lu -pc_factor_mat_solver_package cholmod to use this direct solver

Consult CHOLMOD documentation for more information about the Common parameters which correspond to the options database keys below.

### Options Database Keys

| -mat_cholmod_dbound <0> | - Minimum absolute value of diagonal entries of D (None)
| -mat_cholmod_grow0 <1.2> | - Global growth ratio when factors are modified (None)
| -mat_cholmod_grow1 <1.2> | - Column growth ratio when factors are modified (None)
| -mat_cholmod_grow2 <5> | - Affine column growth constant when factors are modified (None)
| -mat_cholmod_maxrank <8> | - Max rank of update, larger values are faster but use more memory [2,4,8] (None)
| -mat_cholmod_factor <AUTO> | - (choose one of) SIMPLICIAL AUTO SUPERNODAL
| -mat_cholmod_supernodal_switch <40> | - flop/nnz_L threshold for switching to supernodal factorization (None)
| -mat_cholmod_final_asis <TRUE> | - Leave factors "as is" (None)
| -mat_cholmod_final_pack <TRUE> | - Pack the columns when finished (use FALSE if the factors will be updated later) (None)
| -mat_cholmod_zrelax <0.8> | - 3 real supernodal relaxed amalgamation parameters (None)
| -mat_cholmod_nrelax <4> | - 3 size_t supernodal relaxed amalgamation parameters (None)
| -mat_cholmod_prefer_upper <TRUE> | - Work with upper triangular form (faster when using fill-reducing ordering, slower in natural ordering) (None)
| -mat_cholmod_print <3> | - Verbosity level (None)

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

### See Also

PCCHOLESKY, PCFactorSetMatSolverPackage(), MatSolverPackage

Level:beginner
Location:src/mat/impls/sbaij/seq/cholmod/sbaijcholmod.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages