<div dir="ltr">You might try with -pc_type jacobi (and remove mat_type hypre) to get a baseline. Does that work and how much memory usage do you see?<div>From there you could try -pc_type gamg to test the built-in AMG.<div>However, 32M equations in 3D (Lapalcian?) might be too much. AMG does use a lot of memory.</div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Dec 3, 2021 at 7:57 AM Karthikeyan Chockalingam - STFC UKRI <<a href="mailto:karthikeyan.chockalingam@stfc.ac.uk">karthikeyan.chockalingam@stfc.ac.uk</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">
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<p class="MsoNormal">Hello,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I am able to successfully run hypre on gpus but the problem seems to consumption a lot of memory. I ran ksp/ksp/tutorial/ex45 on a grid of 320 x 320 x 320 using 6 gpus by the following options<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="gmail-m_-5811115292702967359p1"><span class="gmail-m_-5811115292702967359s1"><span style="font-size:10pt">mpirun -n 6 ./ex45 -da_grid_x 320 -da_grid_y 320 -da_grid_z 320 -dm_mat_type hypre -dm_vec_type cuda -ksp_type cg -pc_type hypre -pc_hypre_type boomeramg</span></span><span class="gmail-m_-5811115292702967359apple-converted-space"><span style="font-size:10pt">
</span></span><span class="gmail-m_-5811115292702967359s1"><span style="font-size:10pt">-ksp_monitor -log_view -malloc_dump</span></span><span class="gmail-m_-5811115292702967359apple-converted-space"><span style="font-size:10pt">
</span></span><span class="gmail-m_-5811115292702967359s1"><span style="font-size:10pt">-memory_view -malloc_log<u></u><u></u></span></span></p>
<p class="gmail-m_-5811115292702967359p1"><span class="gmail-m_-5811115292702967359s1"><span style="font-size:10pt"><u></u> <u></u></span></span></p>
<p class="gmail-m_-5811115292702967359p1"><span class="gmail-m_-5811115292702967359s1"><span style="font-size:10pt">From the log_view out (also attached) I get the following memory consumption:</span></span><span style="font-size:10pt"><u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Summary of Memory Usage in PETSc<u></u><u></u></p>
<p class="MsoNormal">Maximum (over computational time) process memory: total 9.7412e+09 max 1.6999e+09 min 1.5368e+09<u></u><u></u></p>
<p class="MsoNormal">Current process memory: total 8.1640e+09 max 1.4359e+09 min 1.2733e+09<u></u><u></u></p>
<p class="MsoNormal">Maximum (over computational time) space PetscMalloc()ed: total 7.7661e+08 max 1.3401e+08 min 1.1148e+08<u></u><u></u></p>
<p class="MsoNormal">Current space PetscMalloc()ed: total 1.8356e+06 max 3.0594e+05 min 3.0594e+05<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Each gpu is a Nvidia Tesla V100 – even using 4 gpus the system runs out of cuda memory alloc for the above problem. From the above listed memory output I believe the problem should be able to run on one gpu. Is the memory usage of hypre
not listed include above?<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Best,<u></u><u></u></p>
<p class="MsoNormal">Karthik.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
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