<div dir="ltr">There appears to be a bug connected to impi versions from 2017 or later when running mpi on AVX512 capable machines. In 0.01-0.1% of cases for an ill-conditioned problem the eigenvectors end up with slightly wrong total charge (0.001-0.2 electrons total for 30 k-points), which will appear as an anomaly in :NEC01.<div><br></div><div>The mixer will handle this adequately, but it is still not "right".</div><div><br></div><div>N.B., it may be something OS or fabric related rather than specific to impi; I know that it has "gone away" when I switched to an earlier impi version. Compiler options, mkl, shared/static, scalapck version (mkl or Netlib) had no effect, only regressing the impi version. I am 99.999% certain this is not a Wien2k bug.<br clear="all"><div><br></div>-- <br><div class="m_-7855846507030138252m_6601295117242545626gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><span style="font-size:12.8px">Professor Laurence Marks</span><br></div><div dir="ltr"><span style="font-size:12.8px">"Research is to see what everybody else has seen, and to think what nobody else has thought", </span><span style="font-size:12.8px">Albert Szent-Gyorgi</span><br><a href="http://www.numis.northwestern.edu" target="_blank">www.numis.northwestern.edu</a> ; <span style="font-size:12.8px">C<wbr>orrosion in 4D: </span><a href="http://MURI4D.numis.northwestern.edu" style="font-size:12.8px" target="_blank">MURI4D.numis.northwestern.edu</a><div><span style="font-size:12.8px">Partner of the CFW 100% program for gender equity, </span><a href="http://www.cfw.org/100-percent" style="font-size:12.8px" target="_blank">www.cfw.org/100-percen<wbr>t</a></div><div>Co-Editor, Acta Cryst A</div></div></div></div></div></div></div></div></div></div></div>
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