[petsc-users] PCKSP

[Margarita Satraki]

Hello,

I have difficulty understanding how PCKSP works.

From:
http://www.mcs.anl.gov/petsc/documentation/tutorials/Columbia04/DDandMultigrid.pdf
I understand that instead of using preconditioners, it uses Krylov methods
for the ''inner solvers''.

What are the ''inner solvers''? Is there some kind of a subsystem that is
solved instead of applying a preconditioner?

Many thanks,

Margarita
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