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

Mark Adams mfadams at lbl.gov
Tue Apr 12 06:41:41 CDT 2022

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
If you want more then you need to create them and use


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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