<div dir="ltr">Regarding to your computational source, such a big system with defects could be hard to be computed by quantum espresso directly. Even if you can compute it, the convergence test is also a problem.<div><br></div><div>Since you don't show the calculation details in your post, it's not easy for other qe users to give comments on your calculations straightforward.</div><div><br></div><div>Three rough suggestions to your studied case:</div><div><br></div><div>1. Using quantum espresso with phonopy developed by Prof. Atsushi Togo. (see <a href="https://atztogo.github.io/phonopy/pwscf.html">https://atztogo.github.io/phonopy/pwscf.html</a>)</div><div>2. Using VASP with phonopy (vasp could be more efficient and doable, but it needs your further test)</div><div>3. Please take care of the convergence in your phonon calculations.</div><div><br></div><div>Bests</div><div>Fang</div><div><div><div><div class="gmail_extra"><br><div class="gmail_quote">2018-02-14 3:10 GMT+09:00 Anindya Bose <span dir="ltr"><<a href="mailto:anindya@iiita.ac.in" target="_blank">anindya@iiita.ac.in</a>></span>:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Dear Qe Experts,<br>I am performing a phonon calculation of a Graphene 5*5 supercell(consisting defects) with 32 processors but it is taking too much time and the predicted time of computation can be endless.Is there any other way to do such phonon calculation where all the phonon modes can be computed parallely so that the computation time will be minimized.The supercell having 150 phonon modes.Is there any way out.Please help.<br><br>Thanks and regards,<br>Anindya Bose,<br>Research Fellow,<br>IIIT Allahabad
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