[petsc-users] Solving multiple linear systems with similar matrix sequentially

[Mark Adams]

>
>
> >
> > The RAP is often more than 50% of PCSetUp, so this might not save much.
>
>    Hee,hee  in some of my recent runs of GAMG the RAP was less than 25% of
> the time. Thus skipping the other portions could really pay off.*
>
>
This percentage is very problem dependant.  3D elasticity is higher, 2D
scalar is lower.


>   Barry
>
> * this could just be because the RAP portion has been optimized much more
> than the other parts but ...
>
>
>
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