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Hello everyone, Thank you Mark for your suggestion - pc_hypre_boomeramg_grid_sweeps_all 2 indeed worked! Apologies for the very delayed response. Best Parv From: petsc-users <petsc-users-bounces@ mcs. anl. gov> On Behalf Of Mark Adams Sent:
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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hello everyone,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Thank you Mark for your suggestion -
</span>pc_hypre_boomeramg_grid_sweeps_all 2 indeed worked!<o:p></o:p></p>
<p class="MsoNormal">Apologies for the very delayed response.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best<o:p></o:p></p>
<p class="MsoNormal">Parv<span style="mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> petsc-users <petsc-users-bounces@mcs.anl.gov>
<b>On Behalf Of </b>Mark Adams<br>
<b>Sent:</b> Sunday, January 7, 2024 12:58 AM<br>
<b>To:</b> Pierre Jolivet <pierre@joliv.et><br>
<b>Cc:</b> petsc-users@mcs.anl.gov<br>
<b>Subject:</b> Re: [petsc-users] Hypre BoomerAMG settings options database<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt">I was thinking about interpreting the "</span>BoomerAMG SOLVER PARAMETERS:<span style="font-size:10.0pt">" stuff (eg, what is the closest thing to SSOR that Parv wants).<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt">That does not look like our code, but maybe it is.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt">On Sat, Jan 6, 2024 at 12:50 PM Pierre Jolivet <<a href="mailto:pierre@joliv.et">pierre@joliv.et</a>> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt"><o:p> </o:p></span></p>
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<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt">On 6 Jan 2024, at 3:15 PM, Mark Adams <<a href="mailto:mfadams@lbl.gov" target="_blank">mfadams@lbl.gov</a>> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt"><o:p> </o:p></span></p>
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<pre><span style="color:#666666">Does this work for you?</span><o:p></o:p></pre>
<pre><span style="color:#666666">-pc_hypre_boomeramg_grid_sweeps_all 2</span><o:p></o:p></pre>
<pre>The comment in our code says SSOR is the default but it looks like it is really "hSGS"<o:p></o:p></pre>
<pre>I thought it was an L1 Jacobi, but you would want to ask Hypre about this.<o:p></o:p></pre>
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<p class="MsoNormal"><span style="font-size:10.0pt">HYPRE’s default settings are not the same as the ones we set in PETSc as default, so do not ask HYPRE people (about this particular issue).<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt">Thanks,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt">Pierre<o:p></o:p></span></p>
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<pre>Mark<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
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<p class="MsoNormal"><span style="font-size:10.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt">On Fri, Jan 5, 2024 at 10:21 AM Barry Smith <<a href="mailto:bsmith@petsc.dev" target="_blank">bsmith@petsc.dev</a>> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt"> Yes, the handling of BoomerAMG options starts at line 365. If we don't support what you want but hypre has a function call that allows one to set the values then the option could easily be added to the PETSc
options database here either by you (with a merge request) or us. So I would say check the hypre docs.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt"> Just let us know what BoomerAMG function is missing from the code.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt"> Barry<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt"><o:p> </o:p></span></p>
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<br>
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt">On Jan 5, 2024, at 7:52 AM, Khurana, Parv <<a href="mailto:p.khurana22@imperial.ac.uk" target="_blank">p.khurana22@imperial.ac.uk</a>> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal">Hello PETSc users community,<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Happy new year! Thank you for the community support as always.<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">I am using BoomerAMG for my research, and it is interfaced to my software via PETSc. I can only use options database keys as of now to tweak the settings I want for the AMG solve.<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">I want to control the number of smoothener iterations at pre/post step for a given AMG cycle. I am looking for an options database key which helps me control this. I am not sure whether this is possible directly via the keys (Line 365: <a href="https://urldefense.us/v3/__https://www.mcs.anl.gov/petsc/petsc-3.5.4/src/ksp/pc/impls/hypre/hypre.c.html__;!!G_uCfscf7eWS!aTCg-75Y-gqRtqf04rTmBvnW_umETCNwzCol-A2kwOKVZfH42p-NgGyJh6rdI3VWczX1nGFLF-84NxCRe5kB4cziDcCyQl1c$" target="_blank"><span style="color:#0563C1">https://www.mcs.anl.gov/petsc/petsc-3.5.4/src/ksp/pc/impls/hypre/hypre.c.html</span></a>).
My comprehension of the current setup is that I have 1 smoothener iteration at every coarsening step. My aim is to do two pre and 2 post smoothening steps using the SSOR smoothener.<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">BoomerAMG SOLVER PARAMETERS:<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"> Maximum number of cycles: 1 <o:p></o:p></p>
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<p class="MsoNormal"> Stopping Tolerance: 0.000000e+00 <o:p></o:p></p>
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<p class="MsoNormal"> Cycle type (1 = V, 2 = W, etc.): 1<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"> Relaxation Parameters:<o:p></o:p></p>
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<p class="MsoNormal"> Visiting Grid: down up coarse<o:p></o:p></p>
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<p class="MsoNormal"> Number of sweeps: 1 1 1 <o:p></o:p></p>
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<p class="MsoNormal"> Type 0=Jac, 3=hGS, 6=hSGS, 9=GE: 6 6 9 <o:p></o:p></p>
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<p class="MsoNormal"> Point types, partial sweeps (1=C, -1=F):<o:p></o:p></p>
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<p class="MsoNormal"> Pre-CG relaxation (down): 1 -1<o:p></o:p></p>
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<p class="MsoNormal"> Post-CG relaxation (up): -1 1<o:p></o:p></p>
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<p class="MsoNormal"> Coarsest grid: 0<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">PETSC settings I am using currently: <o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">-ksp_type preonly<o:p></o:p></p>
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<p class="MsoNormal">-pc_type hypre<o:p></o:p></p>
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<p class="MsoNormal">-pc_hypre_type boomeramg<o:p></o:p></p>
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<p class="MsoNormal">-pc_hypre_boomeramg_coarsen_type hmis<o:p></o:p></p>
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<p class="MsoNormal">-pc_hypre_boomeramg_relax_type_all symmetric-sor/jacobi<o:p></o:p></p>
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<p class="MsoNormal">-pc_hypre_boomeramg_strong_threshold 0.7<o:p></o:p></p>
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<p class="MsoNormal">-pc_hypre_boomeramg_interp_type ext+i<o:p></o:p></p>
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<p class="MsoNormal">-pc_hypre_boomeramg_P_max 2<o:p></o:p></p>
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<p class="MsoNormal">-pc_hypre_boomeramg_truncfactor 0.3<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Thanks and Best<o:p></o:p></p>
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<p class="MsoNormal">Parv Khurana<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt"><o:p> </o:p></span></p>
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