<div dir="ltr"><div>Hi All,<br><br>I am kind of struggling with NEB calculations and relatively new to the code. It would be really helpful, if someone can help with any pointers to get this fixed. I am trying to perform a calculation which involves a "very" low barrier and an tricky pathway. Hence the tighter convergence criterion. The objective of the calculation is to perform a CI-NEB calculation on "13 images interpolated between initial and final state". I have provided a pseudo-input file that might be helpful.<br></div><div>The calculation terminates with the following error from MPI crashing.<br><br></div><div>Started the execution with the following prompt :<br>mpirun -np 60 neb.x -nimage 4 -inp $IN > $OUT<br></div><div><br>Thanks for any help !<br><br>########## OUTPUT ##########<br><font size="1">Program NEB v.5.2.0 starts on 25Aug2015 at 10:54:53 <br><br> This program is part of the open-source Quantum ESPRESSO suite<br> for quantum simulation of materials; please cite<br> "P. Giannozzi et al., J. Phys.:Condens. Matter 21 395502 (2009);<br> URL <a href="http://www.quantum-espresso.org" target="_blank">http://www.quantum-espresso.org</a>", <br> in publications or presentations arising from this work. More details at<br> <a href="http://www.quantum-espresso.org/quote" target="_blank">http://www.quantum-espresso.org/quote</a><br><br> Parallel version (MPI), running on 60 processors<br> path-images division: nimage = 4<br> R & G space division: proc/nbgrp/npool/nimage = 15<br>-------------------------------------------------------<br>Primary job terminated normally, but 1 process returned<br>a non-zero exit code.. Per user-direction, the job has been aborted.<br>-------------------------------------------------------<br>--------------------------------------------------------------------------<br>mpirun detected that one or more processes exited with non-zero status, thus causing<br>the job to be terminated. The first process to do so was:<br><br> Process name: [[40355,1],58]<br> Exit code: 29<br>--------------------------------------------------------------------------<br></font><br></div>########## INPUT ##########<br><div><div><font size="1">BEGIN<br>BEGIN_PATH_INPUT<br>&PATH<br> string_method = 'neb',<br> restart_mode = 'from_scratch',<br> nstep_path = '2000',<br> num_of_images = 15,<br> opt_scheme = 'broyden',<br> CI_scheme = 'manual',<br> first_last_op t= .false.,<br> ds = 0.75D0, ! optimization step size used by Broyden<br> path_thr = 0.05D0, ! Force threshhold for NEB ev/AA<br>/<br>CLIMBING_IMAGES<br> 2,3,4,5,6,7,8,9,10,11,12,13,14<br>END PATH_INPUT<br><br>BEGIN_ENGINE_INPUT<br>&CONTROL<br> verbosity = 'low',<br> nstep = 5000,<br> restart_mode = 'from_scratch',<br> pseudo_dir = 'PATH_TO_PP',<br> outdir = './',<br> prefix = 'CINEB_NODCC',<br> tprnfor = .true.,<br> etot_conv_thr= 1.0D-6,<br> forc_conv_thr= 1.0D-4,<br>/<br>&SYSTEM<br> ibrav = 0, <br> tot_charge= +1, ! total chg on the system<br> nat = 53,<br> ntyp = 3,<br> ecutwfc = 30.0, ! kinetic energy cutoff (Ry) for wavefunctions<br> ecutrho = 360.0, ! kinetic energy cutoff (Ry) for charge density<br>/<br>&ELECTRONS<br> conv_thr = 1.0D-9, ! convergence threashold on total energy<br>/<br>&IONS<br>/<br>ATOMIC_SPECIES<br>C 12.0107 C.pbe-rrkjus.UPF<br>O 15.9994 O.pbe-rrkjus.UPF<br>H 1.00794 H.pbe-rrkjus.UPF<br><br>K_POINTS {automatic}<br>3 3 1 0 0 0<br><br>CELL_PARAMETERS {angstrom}<br>a1 a2 a3<br>b1 b2 b3<br>c1 c2 c3<br>BEGIN_POSITIONS<br>FIRST_IMAGE<br>ATOMIC_POSITIONS {angstrom}<br>.......<br></font></div><div><font size="1">INTERMEDIATE_IMAGE<br></font></div><div><font size="1">ATOMIC_POSITIONS {angstrom}<br>....<br>...<br>..<br></font></div><div><font size="1">LAST_IMAGE<br></font><font size="1">ATOMIC_POSITIONS {angstrom}<br>......<br></font></div><div><font size="1">END_POSITIONS<br></font></div><div><font size="1">END_ENGINE_INPUT<br></font></div><div><font size="1">END<br><br><br></font></div><div><font size="1">Abhishek<br clear="all"></font></div><div><div><div><div><div dir="ltr"><div><div><div><div><div><div><font size="1"><span style="font-family:georgia,serif"><span style="color:rgb(0,0,255)">-----------------------------------------------------------------------------------------------------------<br>Abhishek Bagusetty<br></span></span></font></div><font size="1"><span style="font-family:georgia,serif"><span style="color:rgb(0,0,255)">PhD Student, Computational Modeling & Simulation<br></span></span></font></div><font size="1"><span style="font-family:georgia,serif"><span style="color:rgb(0,0,255)">Center for Simulation and Modeling<br></span></span></font></div><font size="1"><span style="font-family:georgia,serif"><span style="color:rgb(0,0,255)">Department of Chemical & Petroleum Engineering<br></span></span></font></div><font size="1"><span style="font-family:georgia,serif"><span style="color:rgb(0,0,255)">University of Pittsburgh</span><br><span style="color:rgb(0,0,255)">Pittsburgh, PA - 15261</span></span></font></div><font size="1"><span style="font-family:georgia,serif"><span style="color:rgb(0,0,255)">Office : 920 Benedum Hall<br></span></span></font></div><span style="font-family:verdana,sans-serif"><font size="2"><span style="color:rgb(0,0,255)"></span></font></span><div><div><span style="font-family:verdana,sans-serif"><font size="2"><span style="color:rgb(0,0,255)"></span></font></span><font size="1"><span style="font-family:georgia,serif"><span style="color:rgb(0,0,255)">-----------------------------------------------------------------------------------------------------------</span></span></font></div></div></div></div></div>
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