[petsc-dev] Extend Petsc to uses Pardiso

[Jed Brown]

Jose David Bermeol <jbermeol at purdue.edu> writes:

> Hi again, one more question, what should be the difference between
> MatLUFactorSymbolic and MatLUFactorNumeric?

The first does symbolic factorization (ordering, computing where the
nonzeros will be sizes of supernodes, etc) and the second does numeric
factorization (stuff that depends on the entries).  Most direct solver
packages are split in this way.

When a user changes their matrix entries without changing the nonzero
pattern, PCLU does not repeat symbolic factorization.

If you use dynamic pivoting, there may be little to do in the "symbolic"
stage.
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