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Hi Paul,
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<div class="">thanks for the help. I will give it a try tomorrow. I am indeed using the XXT coarse grid solver.</div>
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<div class="">Marco</div>
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<div class="">On Sep 21, 2017, at 6:49 PM, <a href="mailto:nek5000-users@lists.mcs.anl.gov" class="">
nek5000-users@lists.mcs.anl.gov</a> <<a href="mailto:Nek5000-users@lists.mcs.anl.gov" class="">Nek5000-users@lists.mcs.anl.gov</a>> wrote:</div>
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Hi Marco,</div>
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">I'm not 100 % about the hanging point, but I suggest - especially for larger problems like this - running on a power of 2 processors (i.e., 1024 in your case).</div>
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">This is particularly critical for performance when the XXT (default) coarse grid solver is used. Less so, perhaps, for the AMG coarse solver...I'm assuming you're using the XXT one - but not certain.</div>
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">Best,</div>
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">Paul</div>
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<div id="x_divRplyFwdMsg" dir="ltr" class=""><font face="Calibri, sans-serif" style="font-size: 11pt;" class=""><b class="">From:</b><span class="Apple-converted-space"> </span>Nek5000-users <<a href="mailto:nek5000-users-bounces@lists.mcs.anl.gov" class="">nek5000-users-bounces@lists.mcs.anl.gov</a>>
on behalf of <a href="mailto:nek5000-users@lists.mcs.anl.gov" class="">nek5000-users@lists.mcs.anl.gov</a> <<a href="mailto:nek5000-users@lists.mcs.anl.gov" class="">nek5000-users@lists.mcs.anl.gov</a>><br class="">
<b class="">Sent:</b><span class="Apple-converted-space"> </span>Thursday, September 21, 2017 3:37:55 PM<br class="">
<b class="">To:</b><span class="Apple-converted-space"> </span><a href="mailto:Nek5000-users@lists.mcs.anl.gov" class="">Nek5000-users@lists.mcs.anl.gov</a><br class="">
<b class="">Subject:</b><span class="Apple-converted-space"> </span>[Nek5000-users] Simulation hanging at 'mapping elements to processors'</font>
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<div class="PlainText">Hello,<br class="">
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I am trying to run a simulation that has ~500,000 elements on 1280 processors with lx1=4 for debugging purposes. My simulation hangs after outputting 'mapping elements to processors’. I generated the mesh with Cubit and then used the exo2nek script to get the
re2 file. Genmap runs fine on the re2 file.<br class="">
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I was wondering if this problem has been encountered in the past, and what I could do to fix it.<br class="">
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Thanks,<br class="">
Marco<br class="">
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