<div class="gmail_quote">On Thu, May 17, 2012 at 2:50 PM, Colin McAuliffe <span dir="ltr"><<a href="mailto:cjm2176@columbia.edu" target="_blank">cjm2176@columbia.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Using the direct solver as a preconditioner I can't seem to find any difference between the results with -ksp_diagonal_scale vs the results without this option. </blockquote><div><br></div><div>I wouldn't expect it to be any different.</div>
<div><br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> I also cant tell if the diagonal scaling is actually being applied in this case.</blockquote></div><div>
<br></div><div>Run with -ksp_view and look for a line that says "diagonally scaled system".</div>