On Thu, Mar 1, 2012 at 11:24 AM, Jed Brown <span dir="ltr"><<a href="mailto:jedbrown@mcs.anl.gov">jedbrown@mcs.anl.gov</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="gmail_quote">On Thu, Mar 1, 2012 at 10:40, Derek Gaston <span dir="ltr"><<a href="mailto:friedmud@gmail.com" target="_blank">friedmud@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>I see, so one of those is the MFFD which really isn't taking up much space. I suppose that's why going from 2->3 matrices ~doubled the memory.</div>
<div><br></div><div>So there's probably nothing wrong here... those matrices are needed and really do take up that much memory... damn ;-)</div></blockquote></div><br><div>When you run with -snes_view, you see the number of nonzeros for all matrices in the system. Third order elements are really expensive.</div>
</blockquote></div><br>You might consider applying this operator matrix-free, and using a low order approximation for the preconditioning matrix.<div><br></div><div> Matt<br clear="all"><div><br></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>
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