On Tue, Mar 16, 2010 at 2:35 PM, Jed Brown <span dir="ltr"><<a href="mailto:jed@59a2.org">jed@59a2.org</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 class="im">On Tue, 16 Mar 2010 14:12:03 -0400, Matthew Knepley <<a href="mailto:knepley@gmail.com">knepley@gmail.com</a>> wrote:<br>
> You have a preconditioner which is ASM, but with a LOT of small<br>
> blocks. You do not save very much by discarding one big block, but if<br>
> you only ever form each small block, you get a lot of savings.<br>
<br>
</div>Unless I misunderstand you, this means that you'll be refactoring each<br>
block on every Krylov iteration. I realize it's a bit less memory, but<br>
that's going to be pretty painful.</blockquote><div><br></div><div>If the number one thing is how big a problem can be run, they will tolerate ait.</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<font color="#888888"><br>
Jed</font></blockquote></div>-- <br>What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>-- Norbert Wiener<br>