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Also, you could run with -mat_view :: ascii_info_detail and send the output for both cases. The storage of matrix values is not redundant, so something else is going on. First, what communicator do you use for the matrix, and what partitioning?
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<div dir="ltr">Also, you could run with<div><br></div><div> -mat_view ::ascii_info_detail</div><div><br></div><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><div><br></div><div> Thanks,</div><div><br></div><div> Matt</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jul 22, 2024 at 10:27 PM Barry Smith <<a href="mailto:bsmith@petsc.dev">bsmith@petsc.dev</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"><div class="msg-757208929489082788">
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Send the code. On Jul 22, 2024, at 9: 18 PM, Matthew Thomas via petsc-users <petsc-users@ mcs. anl. gov> wrote:
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<div><div><br></div> Send the code.<br id="m_-757208929489082788lineBreakAtBeginningOfMessage"><div><br><blockquote type="cite"><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><br><div><div dir="ltr" id="m_-757208929489082788pfptBanner73s8h0l" 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message came from outside your organization.</div></div><div style="height:0px;clear:both;display:block;line-height:0;font-size:0.01px"></div></div><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></div></blockquote></div><br></div></div></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!bBuFOzIbQmePGNYKEiglz1pFB-m95_3tE7Dv1DS5LMTtblIFQltGEJC3V0Vyw3OVtQGdNMEF7g-pCZPJtTQG$" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br></div></div></div></div></div></div></div>