<div dir="ltr">Hi Matt<div>I would rather like to set the block size for block P2 too. Why?</div><div><br></div><div>Because in one of my test (for problem involves only [u_x u_y u_z]), the gmres + Hypre AMG converges in 50 steps with block size 3, whereby it increases to 140 if block size is 1 (see attached files).</div><div><br></div><div>This gives me the impression that AMG will give better inversion for "P2" block if I can set its block size to 3. Of course it's still an hypothesis but worth to try.</div><div><br></div><div>Another question: In one of the Petsc presentation, you said the Hypre AMG does not scale well, because set up cost amortize the iterations. How is it quantified? and what is the memory overhead?</div><div><br></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div dir="ltr">Giang</div></div></div>
<br><div class="gmail_quote">On Mon, Jan 18, 2016 at 5:25 PM, Jed Brown <span dir="ltr"><<a href="mailto:jed@jedbrown.org" target="_blank">jed@jedbrown.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">Hoang Giang Bui <<a href="mailto:hgbk2008@gmail.com">hgbk2008@gmail.com</a>> writes:<br>
<br>
</span><span class="">> Why P2/P2 is not for co-located discretization?<br>
<br>
</span>Matt typed "P2/P2" when me meant "P2/P1".<br>
</blockquote></div><br></div></div>