<div dir="ltr">Just seeing this now. It is hard to imagine how bad GAMG could be on a coarse grid, but you can run with -info and grep on GAMG and send that. You will see listing of levels, number of equations and number of non-zeros (nnz). You can send that and I can get some sense of GAMG is going nuts.<div><br></div><div>Mark</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Mar 8, 2019 at 11:56 AM Jed Brown via petsc-users <<a href="mailto:petsc-users@mcs.anl.gov">petsc-users@mcs.anl.gov</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">It may not address the memory issue, but can you build 3.10 with the<br>
same options you used for 3.6? It is currently a debugging build:<br>
<br>
##########################################################<br>
# #<br>
# WARNING!!! #<br>
# #<br>
# This code was compiled with a debugging option. #<br>
# To get timing results run ./configure #<br>
# using --with-debugging=no, the performance will #<br>
# be generally two or three times faster. #<br>
# #<br>
##########################################################<br>
<br>
</blockquote></div>