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    <p>Dear Neelam</p>
    <p>Other than this, it would be useful if you could also show the
      in/output files of your system. While it does not seem large the
      memory usage depends on the atoms/pseudopotentials you are using,
      size of the vacuum (if any).</p>
    <p>Best<br>
    </p>
    <p>Oleksandr<br>
    </p>
    <div class="moz-cite-prefix">On 06/07/2020 11:52, Michal Krompiec
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAOWoSSP3b2mQ+a7MANRVwxPZJ0Rw1OwsWEW_Tm1br3kucbWGhg@mail.gmail.com">
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      <div dir="ltr">Dear Neelam,
        <div>I am by no means an expert, but from my limited experience
          I can say that 4GB of RAM is not a lot, to put it mildly - but
          at the same time, your system isn't large. In this case, I
          wouldn't use any parallelization on k-points (pw.x -npool 1)
          and make use of symmetry as much as possible (correct ibrav
          instead of ibrav=0). You can save memory by reducing ecutwfc
          (at the expense of accuracy) - so try choosing
          pseudopotentials which give you desired accuracy at the lowest
          ecutwfc (use <a
            href="https://www.materialscloud.org/discover/sssp"
            moz-do-not-send="true">https://www.materialscloud.org/discover/sssp</a> to
          guide you).</div>
        <div>Best,</div>
        <div>Michal</div>
      </div>
      <br>
      <div class="gmail_quote">
        <div dir="ltr" class="gmail_attr">On Mon, 6 Jul 2020 at 10:27,
          Neelam Swarnkar <<a
            href="mailto:neelamswarnkar35@gmail.com"
            moz-do-not-send="true">neelamswarnkar35@gmail.com</a>>
          wrote:<br>
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          0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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            <div>Dear expert and all<br>
            </div>
            <div><br>
            </div>
            <div>I am making the supercell of 2x1x1 total 24 no of
              atoms, and perform scf calculation .but there is memory
              related problem currently i am using 4gb RAM. <br>
            </div>
            <div><br>
            </div>
            <div>What can i do to solve this problem?</div>
            <div><br>
            </div>
            <div>Thanks in advance <br>
            </div>
            <div>Neelam</div>
            <div><br>
            </div>
          </div>
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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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    </blockquote>
    <pre class="moz-signature" cols="72">-- 
Oleksandr Motornyi
PhD, Data Scientist

France</pre>
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