[petsc-users] default preconditioner

Jed Brown jed at 59A2.org
Tue Feb 23 07:31:52 CST 2010

One further caveat is that known symmetric systems (either because you
have set MAT_SYMMETRIC, or the matrix format is SBAIJ) are treated with
ICC(0), bjacobi/ICC(0), and Cholesky inside the redundant solve in FMG.
Note that this is probably not what you want if you have a symmetric
indefinite system.


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