<div dir="ltr">GAMG's eigen estimator worked but the values are very high. You have very low number of equations per processor, is this a thin body? Are the elements badly stretched?<div><div style="color:rgb(80,0,80);font-size:12.8px"><br></div><div style="color:rgb(80,0,80);font-size:12.8px">Do this again with these parameters:</div><div style="color:rgb(80,0,80);font-size:12.8px"><br></div><div style="color:rgb(80,0,80);font-size:12.8px">-mg_levels_ksp_type chebyshev</div><div style="color:rgb(80,0,80);font-size:12.8px">-mg_levels_esteig_ksp_type cg</div><div style="color:rgb(80,0,80);font-size:12.8px">-mg_levels_esteig_ksp_max_it 10</div><div style="color:rgb(80,0,80);font-size:12.8px"><div style="color:rgb(0,0,0);display:inline"></div>-mg_levels_ksp_chebyshev_estei<wbr>g 0,.1,0,1.05</div>-gamg_est_<span style="color:rgb(80,0,80);font-size:12.8px">ksp_type cg</span><br></div><div><span style="color:rgb(80,0,80);font-size:12.8px"><br></span></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Oct 28, 2016 at 9:48 AM, Jeremy Theler <span dir="ltr"><<a href="mailto:jeremy@seamplex.com" target="_blank">jeremy@seamplex.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On Fri, 2016-10-28 at 09:46 -0400, Mark Adams wrote:<br>
> Please run with -info and grep on GAMG.<br>
><br>
</span>[0] PCSetUp_GAMG(): level 0) N=120726, n data rows=3, n data cols=6,<br>
nnz/row (ave)=41, np=1<br>
[0] PCGAMGFilterGraph(): 99.904% nnz after filtering, with<br>
threshold 0., 13.7468 nnz ave. (N=40242)<br>
[0] PCGAMGCoarsen_AGG(): Square Graph on level 1 of 1 to square<br>
[0] PCGAMGProlongator_AGG(): New grid 1894 nodes<br>
[0] PCGAMGOptProlongator_AGG(): Smooth P0: max eigen=5.726852e+00<br>
min=1.330683e-01 PC=jacobi<br>
[0] PCSetUp_GAMG(): 1) N=11364, n data cols=6, nnz/row (ave)=196, 1<br>
active pes<br>
[0] PCGAMGFilterGraph(): 99.9839% nnz after filtering, with<br>
threshold 0., 32.7656 nnz ave. (N=1894)<br>
[0] PCGAMGProlongator_AGG(): New grid 155 nodes<br>
[0] PCGAMGOptProlongator_AGG(): Smooth P0: max eigen=1.011119e+01<br>
min=1.832878e-04 PC=jacobi<br>
[0] PCSetUp_GAMG(): 2) N=930, n data cols=6, nnz/row (ave)=196, 1 active<br>
pes<br>
[0] PCGAMGFilterGraph(): 100.% nnz after filtering, with<br>
threshold 0., 32.7806 nnz ave. (N=155)<br>
[0] PCGAMGProlongator_AGG(): New grid 9 nodes<br>
[0] PCGAMGOptProlongator_AGG(): Smooth P0: max eigen=2.116373e+00<br>
min=6.337173e-03 PC=jacobi<br>
[0] PCSetUp_GAMG(): 3) N=54, n data cols=6, nnz/row (ave)=34, 1 active<br>
pes<br>
[0] PCGAMGFilterGraph(): 100.% nnz after filtering, with<br>
threshold 0., 5.66667 nnz ave. (N=9)<br>
[0] PCGAMGProlongator_AGG(): New grid 2 nodes<br>
[0] PCGAMGOptProlongator_AGG(): Smooth P0: max eigen=1.984549e+00<br>
min=8.582767e-03 PC=jacobi<br>
[0] PCSetUp_GAMG(): 4) N=12, n data cols=6, nnz/row (ave)=12, 1 active<br>
pes<br>
[0] PCSetUp_GAMG(): 5 levels, grid complexity = 1.48586<br>
error: PETSc error 77-0 'Eigen estimator failed: DIVERGED_NANORINF at<br>
<div class="HOEnZb"><div class="h5">iteration 0'<br>
in /home/gtheler/libs/petsc-3.7.<wbr>4/src/ksp/ksp/impls/cheby/<wbr>cheby.c<br>
KSPSolve_Chebyshev:440<br>
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