[petsc-dev] ASM request

Jed Brown jed at 59A2.org
Tue Mar 16 13:35:38 CDT 2010

On Tue, 16 Mar 2010 14:12:03 -0400, Matthew Knepley <knepley at gmail.com> wrote:
>    You have a preconditioner which is ASM, but with a LOT of small
> blocks.  You do not save very much by discarding one big block, but if
> you only ever form each small block, you get a lot of savings.

Unless I misunderstand you, this means that you'll be refactoring each
block on every Krylov iteration.  I realize it's a bit less memory, but
that's going to be pretty painful.


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