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    <p>At least according to configure.log mpiexec was defined as</p>
    <p>Checking for program
      /opt/intel/oneapi/mpi/2021.4.0//bin/mpiexec...found<br>
                        Defined make macro "MPIEXECEXECUTABLE" to
      "/opt/intel/oneapi/mpi/2021.4.0/bin/mpiexec"</p>
    <p>When running ex19 with this mpiexec it fails with the usual
      error, even though all configuration steps worked fine. I attached
      the configuration log.<br>
    </p>
    <p>Regards,</p>
    <p>Roland<br>
    </p>
    <div class="moz-cite-prefix">Am 11.10.21 um 14:24 schrieb Stefano
      Zampini:<br>
    </div>
    <blockquote type="cite"
      cite="mid:1280E270-AAA1-44CE-AE2A-93A2B70462E2@gmail.com">
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      You are most probably using a different mpiexec then the one used
      to compile petsc.
      <div class=""><br class="">
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      <div class=""><br class="">
        <div><br class="">
          <blockquote type="cite" class="">
            <div class="">On Oct 11, 2021, at 3:23 PM, Roland Richter
              <<a href="mailto:roland.richter@ntnu.no"
                class="moz-txt-link-freetext" moz-do-not-send="true">roland.richter@ntnu.no</a>>
              wrote:</div>
            <br class="Apple-interchange-newline">
            <div class="">
              <div class="">
                <p class="">I tried either <i class="">./ex19</i>
                  (SNES-example), <i class="">mpirun ./ex19</i> or <i
                    class="">mpirun -n 1 ./ex19</i>, all with the same
                  result.</p>
                <p class="">Regards,</p>
                <p class="">Roland<br class="">
                </p>
                <div class="moz-cite-prefix">Am 11.10.21 um 14:22
                  schrieb Matthew Knepley:<br class="">
                </div>
                <blockquote type="cite"
cite="mid:CAMYG4Gk+KxdcmJ27ZEoS1UFK4bfY5hgD8PLuc7rL4UNe219K3g@mail.gmail.com"
                  class="">
                  <div dir="ltr" class="">
                    <div dir="ltr" class="">On Mon, Oct 11, 2021 at 8:07
                      AM Roland Richter <<a
                        href="mailto:roland.richter@ntnu.no"
                        moz-do-not-send="true"
                        class="moz-txt-link-freetext">roland.richter@ntnu.no</a>>
                      wrote:<br class="">
                    </div>
                    <div class="gmail_quote">
                      <blockquote class="gmail_quote" style="margin:0px
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                        <div class="">
                          <p class="">Hei,</p>
                          <p class="">at least in gdb it fails with</p>
                          <p class=""><span
                              style="font-family:monospace" class=""><span
                                style="background-color: rgb(255, 255,
                                255);" class="">Attempting to use an MPI
                                routine before initializing MPICH </span><br
                                class="">
                              [Inferior 1 (process 7854) exited with
                              code 01] <br class="">
                              (gdb) backtrace <br class="">
                              No stack.<br class="">
                            </span></p>
                        </div>
                      </blockquote>
                      <div class=""><br class="">
                      </div>
                      <div class="">What were you running? If it never
                        makes it into PETSc code, I am not sure what we
                        are</div>
                      <div class="">doing to cause this.</div>
                      <div class=""><br class="">
                      </div>
                      <div class="">  Thanks,</div>
                      <div class=""><br class="">
                      </div>
                      <div class="">     Matt</div>
                      <div class=""> </div>
                      <blockquote class="gmail_quote" style="margin:0px
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                        <div class="">
                          <p class=""><span
                              style="font-family:monospace" class=""> </span>Regards,</p>
                          <p class="">Roland<br class="">
                            <span style="font-family:monospace" class=""></span></p>
                          <div class="">Am 11.10.21 um 13:57 schrieb
                            Matthew Knepley:<br class="">
                          </div>
                          <blockquote type="cite" class="">
                            <div dir="ltr" class="">
                              <div dir="ltr" class="">On Mon, Oct 11,
                                2021 at 5:24 AM Roland Richter <<a
                                  href="mailto:roland.richter@ntnu.no"
                                  target="_blank" moz-do-not-send="true"
                                  class="moz-txt-link-freetext">roland.richter@ntnu.no</a>>
                                wrote:<br class="">
                              </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">Hei,<br
                                    class="">
                                  <br class="">
                                  I compiled PETSc with Intel MPI
                                  (MPICH) and GCC as compiler (i.e.
                                  using<br class="">
                                  Intel OneAPI together with the
                                  supplied mpicxx-compiler). Compilation<br
                                    class="">
                                  and installation worked fine, but
                                  running the tests resulted in the<br
                                    class="">
                                  error "Attempting to use an MPI
                                  routine before initializing MPICH". A<br
                                    class="">
                                  simple test program (attached) worked
                                  fine with the same combination.<br
                                    class="">
                                  <br class="">
                                  What could be the reason for that?<br
                                    class="">
                                </blockquote>
                                <div class=""><br class="">
                                </div>
                                <div class="">Hi Roland,</div>
                                <div class=""><br class="">
                                </div>
                                <div class="">Can you get a stack trace
                                  for this error using the debugger?</div>
                                <div class=""><br class="">
                                </div>
                                <div class="">  Thanks,</div>
                                <div class=""><br class="">
                                </div>
                                <div class="">     Matt</div>
                                <div class=""> </div>
                                <blockquote class="gmail_quote"
                                  style="margin:0px 0px 0px
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                                  rgb(204,204,204);padding-left:1ex">
                                  Thanks!<br class="">
                                  <br class="">
                                  Regards,<br class="">
                                  <br class="">
                                  Roland Richter<br class="">
                                </blockquote>
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                              -- <br class="">
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                                          <div class="">What most
                                            experimenters take for
                                            granted before they begin
                                            their experiments is
                                            infinitely more interesting
                                            than any results to which
                                            their experiments lead.<br
                                              class="">
                                            -- Norbert Wiener</div>
                                          <div class=""><br class="">
                                          </div>
                                          <div class=""><a
                                              href="http://www.cse.buffalo.edu/~knepley/"
                                              target="_blank"
                                              moz-do-not-send="true"
                                              class="">https://www.cse.buffalo.edu/~knepley/</a><br
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                    -- <br class="">
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                            <div class="">
                              <div dir="ltr" class="">
                                <div class="">What most experimenters
                                  take for granted before they begin
                                  their experiments is infinitely more
                                  interesting than any results to which
                                  their experiments lead.<br class="">
                                  -- Norbert Wiener</div>
                                <div class=""><br class="">
                                </div>
                                <div class=""><a
                                    href="http://www.cse.buffalo.edu/~knepley/"
                                    target="_blank"
                                    moz-do-not-send="true" class="">https://www.cse.buffalo.edu/~knepley/</a><br
                                    class="">
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