[petsc-users] SAME_PRECONDITIONER vs. DIFFERENT_NONZERO_PATTERN

[John Fettig]

I have a question about the difference between SAME_PRECONDITIONER and
DIFFERENT_NONZERO_PATTERN.  If you solve multiple RHS's (with
different initial guesses) but the matrix does not change, should you
expect to get identical results with SAME_PRECONDITIONER and
DIFFERENT_NONZERO_PATTERN?  I think it should be, but I'm finding that
not to be the case with ML.

John