<div class="gmail_quote">On Tue, May 15, 2012 at 3:32 PM, Avery Bingham <span dir="ltr"><<a href="mailto:avery.bingham@gmail.com" target="_blank">avery.bingham@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<pre><font face="arial, helvetica, sans-serif">I have also seen this behavior, and I think this might be related to the scaling of the variables in the nonlinear system. I am using PETSc through an application of MOOSE which allows for scaling of the variables. This scaling reduces the chance that the default cubic backtracking line search fails, but it is not reliable on all problems. Would it be possible to get a scaling-independent Line Search Method implemented within PETSc? </font></pre>
</blockquote><div><br></div><div>I'm not sure what you mean by scaling, but there is -snes_linesearch_type cp (critical point) that might be useful.</div></div>