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<p>So that is how I did it wrong<br>
</p>
<p><br>
</p>
<p>Thanks for the tips</p>
<p><br>
</p>
<p>Have great day</p>
<p><br>
</p>
<p>Thierry Clette<br>
</p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>De :</b> pw_forum-bounces@pwscf.org <pw_forum-bounces@pwscf.org> de la part de stefano de gironcoli <degironc@sissa.it><br>
<b>Envoyé :</b> jeudi 23 juin 2016 10:33:17<br>
<b>À :</b> PWSCF Forum<br>
<b>Objet :</b> Re: [Pw_forum] PBE0 Hybrid functional SCF doesn't complete</font>
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<div class="moz-cite-prefix">the Hybrid calculations are VERY expensive.<br>
in solids the expensive Fock step has an inner summation on k-point that makes it QUADRATIC in the grid dimension used (20*20*20)^2, in your case.
<br>
No wonder it does not complete<br>
<br>
Things I would do:<br>
- reduce the cutoff to the minimum.<br>
- consider using a NC pseudopential.<br>
- please no gaussian smearing. use 'mv' or 'mp'.<br>
- use larger smearing => smaller k-points set<br>
- read, understand and test the nqx1,nqx2,nqx3 input options<br>
- look for a big machine and use band parallelization to distribute work load.<br>
<br>
HTH<br>
<br>
stefano<br>
<br>
On 22/06/2016 12:22, Thierry Clette wrote:<br>
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<p>Hello,</p>
<p><br>
</p>
<p>I'm a student at the University of Brussels. I use QE 5.2.1.<br>
</p>
<p>I'm trying to do a SCF calculation of bulk black Phosphorus, a semiconductor with a small gap. PBE0 seems to be the right method for this, so I use a normcon PBE pseudopotential from the QE site with the option "input-DFT=PBE0". The inputs and outputs are
attached.</p>
<p>As you can see in the output, the calculation in itself seems to work, but the process doesn't seem to finish. It seems it can't write to the save. Usually the process never finishes and is killed by time out. In some cases, it is killed for using too much
RAM (after the calculation is complete, very strange). Anyway, as it doesn't finish, I can't do band calculations.</p>
<p>Are some of my parameters wrong ?</p>
<p><br>
</p>
<p>Thanks in advance</p>
<p><br>
</p>
<p>Thierry Clette<br>
</p>
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