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    <div class="moz-cite-prefix">Recently I played around with some AMD
      EPYC cpus and the bad thing is that I also saw some strange
      numbers when using libflame/aocl 2.1.</div>
    <div class="moz-cite-prefix"><br>
    </div>
    <div class="moz-cite-prefix">The 'workaround' is probably to just
      use Intel's MKL. Since version 2020 the MKL performs rather well
      when using AMD cpus, however, if you want to get the best
      performance you have to additionally set:<br>
    </div>
    <div class="moz-cite-prefix"><br>
    </div>
    <div class="moz-cite-prefix">export MKL_DEBUG_CPU_TYPE=5<br>
    </div>
    <div class="moz-cite-prefix"><br>
    </div>
    <div class="moz-cite-prefix">which gives an additional 10-20%
      speedup with MKL 2020, while for earlier versions the speedup is
      greater than 200%</div>
    <div class="moz-cite-prefix"><br>
    </div>
    <div class="moz-cite-prefix">Kind regards,</div>
    <div class="moz-cite-prefix">Tobias</div>
    <div class="moz-cite-prefix"><br>
    </div>
    <div class="moz-cite-prefix">On 2/2/20 10:57 PM, Paolo Giannozzi
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAPMgbCsAiTK+wmcBvGxbSVLgqWpbrTnany-AO4X4cAy4j9pH1Q@mail.gmail.com">
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        <div dir="ltr">On Sun, Feb 2, 2020 at 10:23 PM Evgeny Permyakov
          <<a href="mailto:permeakra@gmail.com"
            moz-do-not-send="true">permeakra@gmail.com</a>> wrote:</div>
        <div dir="ltr"><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">
            <div dir="ltr">sidenote: I had to set  **orte_execute_quiet
              = true** in ~/.openmpi/mca-params.conf so mpi didn't mess
              with extra messages<br>
            </div>
          </blockquote>
          <div><br>
          </div>
          <div>thank you for  this useful piece of information: I got
            rid of those annoying messages<br>
          </div>
          <div><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 dir="ltr">I don't use epw in my work and pwscf tests
              work just fine, but the fact that some tests failed bother
              me. Should I investigate it further and how? I'm not
              versed in QE code, I'm a humble user.</div>
          </blockquote>
          <div> </div>
          <div>investigating further would be a good thing, but it is
            not easy: one has to figure out which piece of code fails,
            then why. Even if one succeeds, very often the problem is in
            the library itself and  there is nothing that can be done.<br>
          </div>
          <div><br>
          </div>
          <div>Frequent offenders are complex-valued routines (e.g.
            zdotc) that seem to follow two different incompatible
            conventions, but the symptom is a hard crash, not a wrong
            number. <br>
          </div>
          <br clear="all">
        </div>
        Paolo<br>
        <div>-- <br>
          <div dir="ltr" class="gmail_signature">
            <div dir="ltr">
              <div>
                <div dir="ltr">
                  <div>Paolo Giannozzi, Dip. Scienze Matematiche
                    Informatiche e Fisiche,<br>
                    Univ. Udine, via delle Scienze 208, 33100 Udine,
                    Italy<br>
                    Phone +39-0432-558216, fax +39-0432-558222<br>
                    <br>
                  </div>
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      <pre class="moz-quote-pre" wrap="">_______________________________________________
Quantum ESPRESSO is supported by MaX (<a class="moz-txt-link-abbreviated" href="http://www.max-centre.eu/quantum-espresso">www.max-centre.eu/quantum-espresso</a>)
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    <p><br>
    </p>
    <pre class="moz-signature" cols="72">-- 
M.Sc. Tobias Klöffel
=======================================================
HPC (High Performance Computing) group
Erlangen Regional Computing Center(RRZE)
Friedrich-Alexander-Universität Erlangen-Nürnberg
Martensstr. 1
91058 Erlangen

Room: 1.133
Phone: +49 (0) 9131 / 85 - 20101

=======================================================

E-mail: <a class="moz-txt-link-abbreviated" href="mailto:tobias.kloeffel@fau.de">tobias.kloeffel@fau.de</a></pre>
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