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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>
</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">
<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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<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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</blockquote>
<pre class="moz-signature" cols="72">--
Oleksandr Motornyi
PhD, Data Scientist
France</pre>
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