<html><body><div style="font-family: arial,helvetica,sans-serif; font-size: 12pt; color: #000000"><div>Hi.<br></div><div>If it succeed for the smaller system, I would guess it is a memory problem maybe.<br></div><div>For a vc-relax of the conventional larger cell, do you really need so many kpt?<br></div><div><br></div><div><span name="x"></span><table class="mceItemTable" xmlns="urn:zimbraAccount"><tbody><tr><td><img alt="Université Paris-Sud" src="https://zimbra.u-psud.fr/public/z_logo_signature.png" style="border: 0pt none;width:120px;height:107px;background:url(data:image/png;base64,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" data-mce-src="https://zimbra.u-psud.fr/public/z_logo_signature.png" data-mce-style="border: 0pt none; width: 120px; height: 107px; background: url(data:image/png;"></td><td valign="top"><div><span style="font-size: 10pt" data-mce-style="font-size: 10pt;"><b>Federico IORI</b></span></div><div><span style="font-size: 10pt" data-mce-style="font-size: 10pt;">Marie Curie Fellow<br>Laboratoire de Physique des Solides<br>Bâtiment 510 - Rue André Rivière<br>91400 Orsay</span></div></td></tr></tbody></table><div><br></div><span name="x"></span><br></div><hr id="zwchr"><div style="color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;" data-mce-style="color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"><b>De: </b>"Hongsheng Liu" <lhs.happy2007@gmail.com><br><b>Para: </b>"PWSCF Forum" <pw_forum@pwscf.org><br><b>Enviados: </b>Miércoles, 8 de Febrero 2017 17:49:26<br><b>Asunto: </b>[Pw_forum] problem with DFT+U<br><div><br></div><div dir="ltr"><div><div>Dear all,<br></div>  I'm trying to do a geometry optimization for bulk magnetite with PBE+U. The job succeeded with primitive cell (including 14 atoms), but failed with conventional cell (including 56 atoms). The error message is shown below,<br>  'Fatal error in PMPI_Bcast: Other MPI error, error stack:<br>  PMPI_Bcast(2434)........: MPI_Bcast(buf=0x998c5a0, count=3366, MPI_DOUBLE_PRECISION,   root=4, comm=0x84000002) failed<br>  MPIR_Bcast_impl(1807)...:<br>  MPIR_Bcast(1835)........:'<br><div><br></div></div><div>Similar question was asked before on pw_forum, but it seems no solution till now. <br></div><div> My input is listed below,<br> &CONTROL<br>  calculation    = "vc-relax",<br>......<br>/<br>&SYSTEM<br>  ibrav = 1<br>  A = 8.522631 <br>  nat = 56,<br>  ntyp = 3,<br>  ecutwfc = 42.0, <br>  ecutrho = 340.0,<br>  nspin = 2,<br>  starting_magnetization(1) = 0,<br>  starting_magnetization(2) = -0.25,<br>  starting_magnetization(3) = 0.25,<br>  occupations = 'smearing',<br>  smearing = 'gaussian',<br>  degauss = 0.0008,<br>  lda_plus_u = .TRUE. <br>  lda_plus_u_kind = 0<br>  Hubbard_U(1) = 0,<br>  Hubbard_U(2) = 3,<br>  Hubbard_U(3) = 3,<br>/<br>.........<br>/<br>&CELL<br>  cell_dofree = 'volume'<br>/<br>......<br>K_POINTS automatic                                    <br>6 6 6 0 0 0     <br><div><br></div>I appreciate any help!<br></div></div><br>_______________________________________________<br>Pw_forum mailing list<br>Pw_forum@pwscf.org<br>http://pwscf.org/mailman/listinfo/pw_forum</div><div><br></div></div></body></html>