[petsc-dev] How does PETSc define the overlap in an algebraic ASM preconditioner ?

Matthew Knepley knepley at gmail.com
Tue Apr 12 07:26:59 CDT 2022

On Tue, Apr 12, 2022 at 4:14 AM markwinpe <markwinpe at 163.com> wrote:

> Dear PETSc’s developers,
>      Currently, I don’t have a geometric mesh for a PDE problem, I just
> got a matrix from others and I want to use the ASM preconditioner to solve
> the linear system. I would be appreciated if you could describe how PETSc
> defines the overlap in the context of using the algebraic ASM
> preconditioner.

The overlap is defined in terms of the matrix graph.



> Best,
> Wenpeng

What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener

https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
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