[petsc-users] An advice on a linear system solution

[Umut Tabak]

On 01/12/2015 04:29 PM, Matthew Knepley wrote:
> Fieldsplit block preconditioners can be used on this type of matrix, 
> but success obviously depends on the
> analytic character of the operators.  In particular, if we assume that 
> we have great PCs for the diagonal,
> then B is the most important variable, and we need to know what the 
> Schur complement
Dear Matt,
Thanks, I have a bit of difficult time understanding what you mean by 
¨great PCs¨ for the diagonal? Could you please rephrase it?
Thanks in advance.
Umut