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On Tue, Jul 23, 2024 at 8: 02 PM Matthew Thomas <matthew. thomas1@ anu. edu. au> wrote: Hello Matt, I have attached the output with mat_view for 8 and 40 processors. I am unsure what is meant by the matrix communicator and the partitioning.
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<div dir="ltr"><div dir="ltr">On Tue, Jul 23, 2024 at 8:02 PM Matthew Thomas <<a href="mailto:matthew.thomas1@anu.edu.au">matthew.thomas1@anu.edu.au</a>> wrote:<br></div><div class="gmail_quote"><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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<div>Hello Matt,
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<div>I have attached the output with mat_view for 8 and 40 processors.</div>
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<div>I am unsure what is meant by the matrix communicator and the partitioning. I am using the default behaviour in every case. How can I find this information?</div></div></div></blockquote><div><br></div><div>This shows that the matrix is taking the same amount of memory for 8 and 40 procs, so that is not your problem. Also,</div><div>it is a very small amount of memory:</div><div><br></div><div> 100K rows x 3 nz/row x 8 bytes/nz = 2.4 MB</div><div><br></div><div>and 50% overhead for indexing, so something under 4MB. I am not sure what is taking up the rest of the memory, but I do not</div><div>think it is PETSc from the log you included.</div><div><br></div><div> Thanks,</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div>
<div>I have attached the log view as well if that helps.</div>
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<div>Thanks,</div>
<div>Matt</div>
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<div>On 23 Jul 2024, at 9:24 PM, Matthew Knepley <<a href="mailto:knepley@gmail.com" target="_blank">knepley@gmail.com</a>> wrote:</div>
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<div dir="ltr">Also, you could run with
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<div> -mat_view ::ascii_info_detail</div>
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<div>and send the output for both cases. The storage of matrix values is not redundant, so something else is</div>
<div>going on. First, what communicator do you use for the matrix, and what partitioning?</div>
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<div dir="ltr">On Mon, Jul 22, 2024 at 10:27 PM Barry Smith <<a href="mailto:bsmith@petsc.dev" target="_blank">bsmith@petsc.dev</a>> wrote:<br>
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<div>On Jul 22, 2024, at 9:18 PM, Matthew Thomas via petsc-users <<a href="mailto:petsc-users@mcs.anl.gov" target="_blank">petsc-users@mcs.anl.gov</a>> wrote:</div>
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<pre style="font-size:18px;font-style:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;word-spacing:0px;text-decoration:none;font-family:sans-serif;white-space:pre-wrap">Hello,
I am using petsc and slepc to solve an eigenvalue problem for sparse matrices. When I run my code with double the number of processors, the memory usage also doubles.
I am able to reproduce this behaviour with ex1 of slepc’s hands on exercises.
The issue is occurring with petsc not with slepc as this still occurs when I remove the solve step and just create and assemble the petsc matrix.
With n=100000, this uses ~1Gb with 8 processors, but ~5Gb with 40 processors.
This was done with petsc 3.21.3, on linux compiled with Intel using Intel-MPI
Is this the expected behaviour? If not, how can I bug fix this?
Thanks,
Matt</pre>
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</blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div>What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>-- Norbert Wiener</div><div><br></div><div><a href="https://urldefense.us/v3/__http://www.cse.buffalo.edu/*knepley/__;fg!!G_uCfscf7eWS!b_JFRb7MxmdPHCjjuC42vps0Cvkz5tuUTRRK-Yh20xdmpvEHr2guqznV0TGVXhEiNnXVEZeCCPSlW9-ZqDyD$" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br></div></div></div></div></div></div></div></div>