<div class="gmail_quote">On Tue, Jan 17, 2012 at 02:31, <span dir="ltr"><<a href="mailto:domenico.borzacchiello@univ-st-etienne.fr">domenico.borzacchiello@univ-st-etienne.fr</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div id=":1jm">I'd like to know if the tufo-fischer direct solver is suitable to solve<br>
saddle problems.</div></blockquote></div><br><div>Not unless you formulate A^T A which doubles the condition number.</div><div><br></div><div>If you need a direct coarse level solver, I suggest using MUMPS or SuperLU_DIST, semi-redundantly if you have too many processors (e.g. thousands).</div>