<div class="gmail_quote">On Tue, Dec 21, 2010 at 21:26, Vijay S. Mahadevan <span dir="ltr"><<a href="mailto:vijay.m@gmail.com">vijay.m@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div id=":41a"> 45 KSP preconditioned resid norm 2.511364148934e-07 true resid norm<br>
1.865039278877e+02 ||Ae||/||Ax|| 2.699481989705e+02</div></blockquote></div><br><div>The true residual is huge, this is not converging. You probably have a singular preconditioner. What are you using (-ksp_view) and what system are you solving with what discretization.</div>