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

[Mark Adams]

You can see https://petsc.org/main/docs/manualpages/PC/PCASM.html
It is very simple as you can see but you are limited to one block per MPI
process.
If you want more then you need to create them and use
https://petsc.org/main/docs/manualpages/PC/PCASMSetLocalSubdomains.html#PCASMSetLocalSubdomains

Mark


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.
>
>
>
> Best,
>
>
> Wenpeng
>
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