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Dear all,<div><br></div><div>I am using the EPW package in conjunction with QE to calculate electron phonon coefficients for systems. The "scf", "ph" and "nscf" run quite smoothly; however when I execute the last step which is using the "epw.x" command I get the error:</div><div><br></div><div>"Q(r) pseudized with 0 coefficients</div><div><br></div><div> EPW : 6.72s CPU time, 17.23s wall time</div><div><br></div><div> EPW : 14.08s CPU time, 28.02s wall time</div><div><br></div><div> EPW : 14.08s CPU time, 28.02s wall time</div><div><br></div><div><br></div><div> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</div><div> from setphases_wrap : error # 1</div><div> only one proc per pool</div><div> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%"</div><div><br></div><div>"The parallel execution is such that:</div><div><br></div><div><div>Program EPW v.2.3.5 starts ...</div><div> Today is 12Nov2012 at 2:27:22</div><div><br></div><div> Parallel version (MPI)</div><div><br></div><div> Number of processors in use: 16</div><div> R & G space division: proc/pool = 16"</div></div><div><br></div><div>However when I reduce the number to 8 processors (that is 1 node on the cluster I am working on), I get another error from davcio:</div><div><br></div><div>"<span style="font-size: 10pt;">%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</span></div><div> from davcio : error # 20</div><div> error while reading from file</div><div> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</div><div>"</div><div><br></div><div>Mind you that the previous scf , nscf and ph steps were done with 16 processors. Could that be the error? Would repeating everything with 8 processors work?</div><div><br></div><div>Thanks in advance</div><div><br></div><div>Elias ALbert</div><div>Uniiversity of Derby</div><div>DE12 4ER</div><div>UK</div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div> </div></body>
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