[petsc-users] Does the kspsolver used in the DMDA take the special structrue of the cartesian coordinate into consideration.

[Jed Brown]

丁老师 <ztdepyahoo at 163.com> writes:

> since in cartesian coordinate system, the matrix vector operation can
> be explicitly known. 

What can be "explicitly known"?

> Does the kspsolver used in the DMDA take the special structrue of the
> cartesian coordinate into consideration.

DMDA sets nonzero pattern, but you assemble the matrix.  You can also
define matrix-free products, but don't do that until you are happy with
a preconditioner and profiling tells you that optimizing the matrix
representation will give a speedup that is more valuable than either (a)
further optimizing preconditioning algorithms or (b) adding new
physics/analysis to your code.
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