<div class="gmail_extra">On Sun, Nov 4, 2012 at 7:52 AM, Mark F. Adams <span dir="ltr"><<a href="mailto:mark.adams@columbia.edu" target="_blank">mark.adams@columbia.edu</a>></span> wrote:<br><div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>2) Try using hyper (-pc_type hyper -pc_hypre_type boomeramg). Look at "<span style="font-family:arial;font-size:14px;line-height:23px">PCApply 448</span>", this should be like 10-20. Configure your systems with --download-hyper=1 if you do not have it.</div>
</blockquote><div><br></div><div>Jim, you can use -pc_type hypre (note the spelling "hypre", not "hyper").</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><br></div><div>3) Why do you say it is ill conditioned? Stretched grids? large jumps in material coefficients? Why do you think it is illoconditioned?</div></blockquote></div><br></div><div class="gmail_extra">This question is important.</div>
<div class="gmail_extra"><br></div><div class="gmail_extra">PETSc devs, we may need to write an FAQ about how saying that your problem is "ill-conditioned" is useless, and explaining the sort of context that is necessary to say something useful.</div>