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<p>Hi Marco,</p>
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<p>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).</p>
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<p>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.</p>
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<p>Best,</p>
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<p>Paul</p>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Nek5000-users <nek5000-users-bounces@lists.mcs.anl.gov> on behalf of nek5000-users@lists.mcs.anl.gov <nek5000-users@lists.mcs.anl.gov><br>
<b>Sent:</b> Thursday, September 21, 2017 3:37:55 PM<br>
<b>To:</b> Nek5000-users@lists.mcs.anl.gov<br>
<b>Subject:</b> [Nek5000-users] Simulation hanging at 'mapping elements to processors'</font>
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<div class="PlainText">Hello,<br>
<br>
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>
<br>
I was wondering if this problem has been encountered in the past, and what I could do to fix it.<br>
<br>
Thanks,<br>
Marco<br>
<br>
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