<HTML><BODY><p>Dear QE users,<br></p><p>I have a question about phonon procedure ph.x<br data-mce-bogus="1"></p><p>As I understood from manual and tutorial, ph.x use linear response method (DPFT). But computational efforts of this method are very sense to quantity of atoms in supercell. Can I use ph.x for phonons calculation of frequencies for system Fe-V with 54 atoms (full interval of different concentrations)? Or should I use another additional program, for example, using small displacement method?<br data-mce-bogus="1"></p><p>What about hardware parameters, I work on «Tornado SUSU» Supercomputer ( http://supercomputer.susu.ac.ru/en/computers/tornado/ ). Quantity of computing units/processors/cores: 480/960/384/29184<br>Type of processor: Intel Xeon X5680 (Gulftown, 6 cores with frequency 3.33 GHz) — 960 pcs.<br>Type of coprocessor: Intel Xeon Phi SE10X (61 cores with frequency 1.1 GHz) — pcs.<br>RAM: 16.9 TB<br data-mce-bogus="1"></p><p>Thank you.<br> Buldashev Ivan, student.<br> South Ural State University.<br data-mce-bogus="1"></p></BODY></HTML>