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    Throws the proper error on my machine:<br>
    <br>
    $ ~/petsc-3.10.1/intel/bin/mpirun -np 2 ex6<br>
    [0]PETSC ERROR: --------------------- Error Message
    --------------------------------------------------------------<br>
    [0]PETSC ERROR: This is a uniprocessor example only!<br>
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</pre>
    <div class="moz-cite-prefix">On 11/17/18 1:51 PM, Fazlul Huq via
      petsc-users wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAE5QvP2cMx5dYm6GjYXQxPYiKNBbFmBdj86Jp00gtFsxgMUang@mail.gmail.com">
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        <div class="gmail_default" style="font-family:comic sans
          ms,sans-serif">Thanks for the answer.</div>
        <div class="gmail_default" style="font-family:comic sans
          ms,sans-serif"><br>
        </div>
        <div class="gmail_default" style="font-family:comic sans
          ms,sans-serif">So, when I run the code with "mpiexec -n 2
          ./ex6" or "mpiexec -n 4 ./ex6" shouldn't it spit out </div>
        <div class="gmail_default" style="font-family:comic sans
          ms,sans-serif">the error "This is a uniprocessor example
          only!"? </div>
        <div class="gmail_default" style="font-family:comic sans
          ms,sans-serif">But it didn't do that rather run the code 2/4
          times.</div>
        <div class="gmail_default" style="font-family:comic sans
          ms,sans-serif"><br>
        </div>
        <div class="gmail_default" style="font-family:comic sans
          ms,sans-serif">Thanks.</div>
        <div class="gmail_default" style="font-family:comic sans
          ms,sans-serif">Sincerely,</div>
        <div class="gmail_default" style="font-family:comic sans
          ms,sans-serif">Huq</div>
      </div>
      <br>
      <div class="gmail_quote">
        <div dir="ltr">On Sat, Nov 17, 2018 at 1:12 PM Fazlul Huq <<a
            href="mailto:huq2090@gmail.com" moz-do-not-send="true">huq2090@gmail.com</a>>
          wrote:<br>
        </div>
        <blockquote class="gmail_quote" style="margin:0 0 0
          .8ex;border-left:1px #ccc solid;padding-left:1ex">
          <div dir="ltr">
            <div dir="ltr">
              <div class="gmail_default" style="font-family:"comic
                sans ms",sans-serif">Hello PETSc developers,</div>
              <div class="gmail_default" style="font-family:"comic
                sans ms",sans-serif"><br>
              </div>
              <div class="gmail_default" style="font-family:"comic
                sans ms",sans-serif">In example 6 or vec section I
                don't understand this line:</div>
              <div class="gmail_default"><font face="comic sans ms,
                  sans-serif">if (size != 1)
                  SETERRQ(PETSC_COMM_SELF,1,"This is a uniprocessor
                  example only!");</font><br>
              </div>
              <div class="gmail_default"><font face="comic sans ms,
                  sans-serif"><br>
                </font></div>
              <div class="gmail_default"><font face="comic sans ms,
                  sans-serif">I tried to run the code with "mpiexec -n 2
                  ./ex6" or "mpiexec -n 4 ./ex6" or even "mpiexec -n 1
                  ./ex6" it the code runs properly.</font></div>
              <div class="gmail_default"><font face="comic sans ms,
                  sans-serif"><br>
                </font></div>
              <div class="gmail_default"><font face="comic sans ms,
                  sans-serif">Thanks.</font></div>
              <div class="gmail_default"><font face="comic sans ms,
                  sans-serif"><br>
                </font></div>
              <div class="gmail_default"><font face="comic sans ms,
                  sans-serif">Sincerely,</font></div>
              <div class="gmail_default"><font face="comic sans ms,
                  sans-serif">Huq</font></div>
              <div><br>
              </div>
              -- <br>
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                class="m_2318007667578293952gmail_signature">
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                      <div>
                        <div dir="ltr"><br>
                          <div><font face="comic sans ms, sans-serif">Fazlul
                              Huq</font></div>
                          <div><font face="comic sans ms, sans-serif">Graduate
                              Research Assistant</font></div>
                          <div><font face="comic sans ms, sans-serif">Department
                              of Nuclear, Plasma & Radiological
                              Engineering (NPRE)</font></div>
                          <div><font face="comic sans ms, sans-serif">University
                              of Illinois at Urbana-Champaign (UIUC)</font></div>
                          <div><font face="comic sans ms, sans-serif">E-mail:
                              <a href="mailto:huq2090@gmail.com"
                                target="_blank" moz-do-not-send="true">huq2090@gmail.com</a></font></div>
                        </div>
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          </div>
        </blockquote>
      </div>
      <br clear="all">
      <div><br>
      </div>
      -- <br>
      <div dir="ltr" class="gmail_signature"
        data-smartmail="gmail_signature">
        <div dir="ltr">
          <div>
            <div dir="ltr">
              <div>
                <div dir="ltr"><br>
                  <div><font face="comic sans ms, sans-serif">Fazlul Huq</font></div>
                  <div><font face="comic sans ms, sans-serif">Graduate
                      Research Assistant</font></div>
                  <div><font face="comic sans ms, sans-serif">Department
                      of Nuclear, Plasma & Radiological Engineering
                      (NPRE)</font></div>
                  <div><font face="comic sans ms, sans-serif">University
                      of Illinois at Urbana-Champaign (UIUC)</font></div>
                  <div><font face="comic sans ms, sans-serif">E-mail: <a
                        href="mailto:huq2090@gmail.com" target="_blank"
                        moz-do-not-send="true">huq2090@gmail.com</a></font></div>
                </div>
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    </blockquote>
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