[petsc-users] How to use multigrid?

[Jed Brown]

On Fri, Nov 9, 2012 at 11:43 AM, Thomas Witkowski <
thomas.witkowski at tu-dresden.de> wrote:

> :) It was just a question whether is makes sense to run my solver in this
> range of number of cores, or whether AMG by itself will not scale here
> anymore. As my computational time is limited, I have to think carefully
> when using 10^4 cores.


Yes, but do a shorter run before a long production run if you need an
accurate estimate of how long it will take and how much memory it will
need. Depending on the architecture, you can extrapolate, but be sure to
control for subdomain sizes.
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