If it is not converged, and you restart it again without any modification (or dirty trick), it should not be converged.<div><br></div><div>1. Grep total energy of last few iteration, if they are converging, you may change the electron_maxstep to 200, 300, 5000 :) or you may increase the conv_th (after getting the relaxed structure, restart the calculation with new structure and read the potential, wavefunction, lower the conv_th...)</div>
<div>2. Play with Mixing_mode and mixing_beta</div><div>3. Change diagonalization </div><div><br clear="all">--------------------------------------------------<br>Duy Le<br>PhD Student<br>Department of Physics<br>University of Central Florida.<br>
<br><br><div class="gmail_quote">On Fri, Oct 9, 2009 at 9:59 AM, Huolin Xin <span dir="ltr"><<a href="mailto:xinhuolin@gmail.com">xinhuolin@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
For such big unit cells, even Gamma point should work, right?<div><div></div><div class="h5"><br><br><div class="gmail_quote">On Fri, Oct 9, 2009 at 7:02 AM, Ary Junior <span dir="ltr"><<a href="mailto:aryjunior@gmail.com" target="_blank">aryjunior@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left:1px solid rgb(204, 204, 204);margin:0pt 0pt 0pt 0.8ex;padding-left:1ex">Did you make any convergence tests for ecut? The set of PW that you are using is enough? And about your k-points sample?<br>
<br>[]<br><br>Ary Junior<div><div></div><div><br><br><div class="gmail_quote">On Fri, Oct 9, 2009 at 7:38 AM, Mighfar Imam <span dir="ltr"><<a href="mailto:mighfar@jncasr.ac.in" target="_blank">mighfar@jncasr.ac.in</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left:1px solid rgb(204, 204, 204);margin:0pt 0pt 0pt 0.8ex;padding-left:1ex">Convergence might be slow or oscillatory, try changing mixing beta.<br>
<br>
mighfar imam<br>
JNCASR, B'lore.<br>
India.<br>
<br>
<br>
Dimpy Sharma<br>
<div><div></div><div>><br>
> Hi Quantum espresso users,<br>
><br>
> I have been trying to perform a relax calculation in my system with 99<br>
> atoms (semiconductor system) and I am running my calculation in 48<br>
> processors. The calculation has finished 3 scf steps and finished 100<br>
> iterations, but after this it stops and it is showing me the following<br>
> message .<br>
> ' convergence NOT achieved after 100 iterations: stopping'<br>
><br>
> I have restart my calculation, still I got the same error message after<br>
> 100 iteration steps.<br>
><br>
> Can any body give me any suggestion?<br>
><br>
> Thanks<br>
><br>
> Dimpy<br>
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