a question about tolerance

Jed Brown jed at 59A2.org
Tue Sep 15 17:41:44 CDT 2009

Ryan Yan wrote:
> But can you say a little more about what happened in the first scenario, I
> did not quite fellow you. Let's say, If I set -ksp_rtol 1e-2, what does this
> mean in the left PC case. More specifically, which term will be considered
> as a stop creteria for the KSP solve.

Look at the first column (preconditioned residual norm).  Notice that
this is decreasing by 1e-2 and 1e-3 respectively in your examples.


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