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    <p><font size="-1">ok</font></p>
    <p><font size="-1">if you are using 6.3 so the problem should  not
        be related to any recent changes in QE.<br>
      </font></p>
    <p><font size="-1">for the MPI library info could you just type <br>
      </font></p>
    <p><font size="-1">mpirun --version <br>
      </font></p>
    <p><font size="-1"> that should print out the name and the version
        of the MPI library you are using.  <br>
      </font></p>
    <p><font size="-1">Pietro<br>
      </font></p>
    <p><font size="-1"></font><br>
    </p>
    <div class="moz-cite-prefix">On 04/03/19 10:12, IORI, Federico
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CACE-OVXr4XpVp+K1Sg0+x1jGzVeA-gYGjdXipG=qGpjnzBeNSw@mail.gmail.com">
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        <div class="gmail_quote">
          <div dir="ltr" class="gmail_attr">On Mon, Mar 4, 2019 at 9:30
            AM Pietro Davide Delugas <<a
              href="mailto:pdelugas@sissa.it" moz-do-not-send="true">pdelugas@sissa.it</a>>
            wrote:<br>
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              <div class="gmail-m_-3799515598419912908moz-cite-prefix">Hi
                Federico<br>
                <br>
                have  you been working with 6.3 stable version or with
                the develop version(s) ? <br>
              </div>
            </div>
          </blockquote>
          <div><br>
          </div>
          <div>6.3 stable version always</div>
          <div> </div>
          <blockquote class="gmail_quote" style="margin:0px 0px 0px
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            <div bgcolor="#FFFFFF">
              <div class="gmail-m_-3799515598419912908moz-cite-prefix">
                does the error occur with this system or also with other
                systems ?
              </div>
            </div>
          </blockquote>
          <div><br>
          </div>
          <div>For the moment  it occurs with the same system CuFeO2 but
            in different geometry : periodic supercell ans slabs </div>
          <div><br>
          </div>
          <div>For the "simple" bulk system I do not get any error. The
            problems starts when I increase the size of my system. But
            this error does not come from  memory problem, does it ?</div>
          <div><br>
          </div>
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              <div class="gmail-m_-3799515598419912908moz-cite-prefix">
                <br>
                what MPI library are you using ? <br>
              </div>
            </div>
          </blockquote>
          <div><br>
          </div>
          <div>INTEL MPIRUN that comes along with the MKL and INTEL
            compiler release 2018$</div>
          <div> </div>
          <blockquote class="gmail_quote" style="margin:0px 0px 0px
            0.8ex;border-left:1px solid
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            <div bgcolor="#FFFFFF">
              <div class="gmail-m_-3799515598419912908moz-cite-prefix">
                have you tried to compile using the ELPA library ? <br>
              </div>
            </div>
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          <div><br>
          </div>
          <div>Nope. </div>
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              <div class="gmail-m_-3799515598419912908moz-cite-prefix">
                <br>
                sorry for replying with more questions  and no answer <br>
              </div>
            </div>
          </blockquote>
          <div><br>
          </div>
          <div>Don't worry. I really appreciate the effort.</div>
          <div><br>
          </div>
          <div>Other doubt: could I come from the PS Libray pseudo ?</div>
          <div>At the beginning I was using the PS libs pseudo compiled
            by me. Then I switch to the same ones but uploaded on the QE
            website.</div>
          <div><br>
          </div>
          <div><br>
          </div>
          <blockquote class="gmail_quote" style="margin:0px 0px 0px
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            <div bgcolor="#FFFFFF">
              <div class="gmail-m_-3799515598419912908moz-cite-prefix">
                Pietro <br>
              </div>
            </div>
          </blockquote>
          <div><br>
          </div>
          <div><br>
          </div>
          <div>Thanks again! </div>
          <blockquote class="gmail_quote" style="margin:0px 0px 0px
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                <br>
                <br>
                <br>
                On 03/01/2019 04:58 PM, IORI, Federico wrote:<br>
              </div>
              <blockquote type="cite">
                <div dir="ltr">Hi everybody.
                  <div>I am working with QE 6.3 and from today also
                    testing QE 6.4 on a CuFeO2 supercell (4x4x1, large
                    system)</div>
                  <div>Recently (since some weeks) I found randomly but
                    very often this error poping up after the 1st - 2nd
                    scf iterations after the initialization of the wfc.</div>
                  <div><br>
                  </div>
                  <div><font face="monospace, monospace">forrtl: severe
                      (71): integer divide by zero<br>
                      Image              PC               
                      Routine            Line        Source<br>
                      pw.x               0000000000CFE59E 
                      Unknown               Unknown  Unknown<br>
                      libpthread-2.22.s  00007FFFEFCA5C10 
                      Unknown               Unknown  Unknown<br>
                      libmkl_scalapack_  00007FFFF790512D 
                      pzhbrdb_              Unknown  Unknown<br>
                      libmkl_scalapack_  00007FFFF781765C 
                      pzherdb_              Unknown  Unknown<br>
                      libmkl_scalapack_  00007FFFF77842B9 
                      mkl_pzheevd0_         Unknown  Unknown<br>
                      libmkl_scalapack_  00007FFFF7782984 
                      mkl_pzheevdm_         Unknown  Unknown<br>
                      libmkl_scalapack_  00007FFFF778191C 
                      pzheevd_              Unknown  Unknown<br>
                      pw.x               0000000000B8E667 
                      zhpev_module_mp_p        1566  zhpev_drv.f90<br>
                      pw.x               0000000000B59CD3 
                      pcdiaghg_                 339  cdiaghg.f90<br>
                      pw.x               0000000000A8B37A 
                      pcegterg_                 957  cegterg.f90<br>
                      pw.x               0000000000659331 
                      diag_bands_               497  c_bands.f90<br>
                      pw.x               00000000006569FB 
                      c_bands_                  101  c_bands.f90<br>
                      pw.x               000000000040CAF1 
                      electrons_scf_            566  electrons.f90<br>
                      pw.x               0000000000409C04 
                      electrons_                152  electrons.f90<br>
                      pw.x               00000000005765BA 
                      run_pwscf_                133  run_pwscf.f90<br>
                      pw.x               00000000004077B5 
                      MAIN__                     98  pwscf.f90<br>
                      pw.x               000000000040761E 
                      Unknown               Unknown  Unknown<br>
                      <a href="http://libc-2.22.so/" target="_blank"
                        moz-do-not-send="true">libc-2.22.so</a>      
                      00007FFFEF613725  __libc_start_main     Unknown 
                      Unknown<br>
                      pw.x               0000000000407529 
                      Unknown               Unknown  Unknown  </font><br>
                  </div>
                  <div><br>
                  </div>
                  <div>Both QE versions are compiled with INTEL 2018 on
                    a Xeon Gold 6128 based cluster linking MKL libraries</div>
                  <div>The error is reproduced on all the different
                    nodes of the cluster.</div>
                  <div><br>
                  </div>
                  <div>I check that the zhpev_drv.f90 routine, where the
                    error seems to come from,  is in the<font
                      face="monospace, monospace"> LAXlib</font>  part,
                    but I don't have still any idea about the why and
                    the how.</div>
                  <div>I am not convinced it is related to memory
                    problem.</div>
                  <div><br>
                  </div>
                  <div>Is there anyone who can give me some hints?</div>
                  <div><br>
                  </div>
                  <div>In attachment the <a href="http://pw.in"
                      target="_blank" moz-do-not-send="true">pw.in</a>
                    and pw.out for sake of completeness.</div>
                  <div><br>
                  </div>
                  <div>Thanks so much.</div>
                  <div>Federico</div>
                  <div>
                    <div><br>
                    </div>
                    -- <br>
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                                            <div><span style="background-color:transparent;font-family:Arial;font-size:10pt;font-weight:700;white-space:pre-wrap">Federico IORI</span><br>
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                <pre>_______________________________________________
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                                <div><span style="background-color:transparent;font-family:Arial;font-size:10pt;font-weight:700;white-space:pre-wrap">Federico IORI</span><br>
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