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    <p>Dear Paolo,</p>
    <p>I have never tried it, but as far as I know if you set disk_io
      ='none' for pw.x there will be no data written on the disk, i.e.
      density or wavefunctions, and you definitely need them to perform
      a projwfc calculation. So simply comment the disk_io line or
      change the parameter value to 'low', 'medium' or 'high'. The
      description of this input variable can be found in pw.x input
      description.</p>
    <p>Best regards,<br>
    </p>
    <pre class="moz-signature" cols="72">Oleksandr Motornyi
PhD

Laboratoire des Solides Irradies
Ecole Polytechnique (Palaiseau, France)</pre>
    <div class="moz-cite-prefix">On 02/27/2019 04:56 PM, Paolo Costa
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAEJEa51Fz3q74W=eeZaNXvJA43aBGsf-m6XSq6c2-We+RrggNQ@mail.gmail.com">
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        <div dir="ltr">
          <div dir="ltr">
            <div dir="ltr">
              <div dir="ltr">Dear QE users,
                <div><br>
                </div>
                <div>I want to calculate Lodwin partial charges. I
                  understood that I have to run projwfc to extract the
                  Lodwin charges. However I got this error:</div>
                <div>
                  <div><br>
                  </div>
                  <div>from davcio : error #        10</div>
                  <div>     error while reading from file</div>
                  <div><br>
                  </div>
                  <div>By reading previous posts, this error occurs when
                    the number of processors used are different from Pw
                    and projwft calculations. However, I used the same
                    number of cores.</div>
                  <div>Any help is highly appreciated.</div>
                  <div>Thanks.</div>
                  <div>Here the input file of pw and projwfc:</div>
                  <div>
                    <div><br>
                    </div>
                    <div>&CONTROL</div>
                    <div>     calculation   = "relax"</div>
                    <div>prefix ='Reactant_ALONE'</div>
                    <div>    forc_conv_thr =  1.0e-03</div>
                    <div>    max_seconds   =  1.34369e+14</div>
                    <div>    nstep         = 400</div>
                    <div>    pseudo_dir    =
                      "/global/home/pcosta/pseudo"</div>
                    <div><span style="white-space:pre">   </span>verbosity 
                         ='high'</div>
                    <div>disk_io ='none'</div>
                    <div>    tprnfor       = .TRUE.</div>
                    <div>    tstress       = .TRUE.</div>
                    <div>/</div>
                    <div><br>
                    </div>
                    <div>&SYSTEM</div>
                    <div>    a     =  3.50000e+01</div>
                    <div>    degauss                   =  0.10</div>
                    <div>    ecutrho                   =  1.33000e+02</div>
                    <div>    ecutwfc                   =  3.2000e+01</div>
                    <div>    lda_plus_u                = .FALSE.</div>
                    <div>    ibrav                     = 1</div>
                    <div>    nat                       = 31</div>
                    <div>    nspin                     = 1</div>
                    <div>    ntyp                      = 6</div>
                    <div>    occupations               = "smearing"</div>
                    <div>    smearing                  = "gaussian"</div>
                    <div>    starting_magnetization(1) =  2.00000e-01</div>
                    <div>/</div>
                    <div><br>
                    </div>
                    <div>&ELECTRONS</div>
                    <div>    conv_thr         =  1.00000e-06</div>
                    <div>    diagonalization  = "david"</div>
                    <div>    mixing_beta      = 0.2</div>
                    <div>    electron_maxstep = 450</div>
                    <div>    startingpot      = "atomic"</div>
                    <div>    startingwfc      = "atomic+random"</div>
                    <div>/</div>
                    <div><br>
                    </div>
                    <div>&IONS</div>
                    <div>    ion_dynamics = "bfgs"</div>
                    <div><span style="white-space:pre">   </span>trust_radius_min=1e-5</div>
                    <div>/</div>
                    <div><br>
                    </div>
                    <div>K_POINTS {gamma}</div>
                    <div><br>
                    </div>
                    <div>ATOMIC_SPECIES</div>
                    <div>B     10.81100   B.pz-n-kjpaw_psl.0.1.UPF</div>
                    <div>N     14.00674   N.pz-n-kjpaw_psl.0.1.UPF</div>
                    <div>C     12.01070   C.pz-n-kjpaw_psl.0.1.UPF</div>
                    <div>H     1.00794    H.pz-kjpaw_psl.0.1.UPF</div>
                    <div>F     18.99840   F.pz-n-kjpaw_psl.0.1.UPF</div>
                    <div>Br    79.90400   Br.pz-n-kjpaw_psl.0.2.UPF</div>
                    <div><br>
                    </div>
                    <div>ATOMIC_POSITIONS {angstrom}</div>
                    <div>B       17.439513804  25.625322834 
                      20.973045091</div>
                    <div>N       16.882879284  26.046299295 
                      19.588650891</div>
                    <div>C       17.611417570  26.577761866 
                      18.547638252</div>
                    <div>C       18.981473543  26.847480834 
                      18.679994501</div>
                    <div>C       19.627787526  26.552801209 
                      19.889428726</div>
                    <div>N       18.946313574  25.987021043 
                      20.943865411</div>
                    <div>C       19.725048002  27.421306063 
                      17.572506985</div>
                    <div>C       20.966884035  26.898825182 
                      17.199885814</div>
                    <div>C       19.215753256  28.507049461 
                      16.854272118</div>
                    <div>C       21.672475010  27.442583578 
                      16.143363528</div>
                    <div>H       21.355632883  26.025431956 
                      17.736034285</div>
                    <div>C       19.928670364  29.053299943 
                      15.803815775</div>
                    <div>H       18.258129871  28.943219988 
                      17.161656267</div>
                    <div>C       21.158317994  28.523222279 
                      15.442553524</div>
                    <div>H       22.636034674  27.008532757 
                      15.854570202</div>
                    <div>H       19.522552264  29.915432507 
                      15.263514196</div>
                    <div>H       21.720598110  28.955759334 
                      14.608217851</div>
                    <div>C       16.755699795  26.709363581 
                      17.431198041</div>
                    <div>C       15.626387791  25.867384471 
                      19.148113264</div>
                    <div>C       20.961586499  26.780304609 
                      20.296707620</div>
                    <div>C       19.816776014  25.851045266 
                      21.957660446</div>
                    <div>F       16.805285541  26.335760829 
                      21.963860569</div>
                    <div>F       17.299909483  24.267118687 
                      21.135505695</div>
                    <div>C       15.503982739  26.269192895 
                      17.814655089</div>
                    <div>C       21.080018363  26.329060350 
                      21.596854814</div>
                    <div>H       21.734290190  27.249658971 
                      19.687403597</div>
                    <div>H       21.957537020  26.337873981 
                      22.242787824</div>
                    <div>H       17.056054376  27.071432630 
                      16.447685129</div>
                    <div>H       14.590507636  26.219539022 
                      17.222738922</div>
                    <div>Br      19.337204180  25.130245441 
                      23.585145081</div>
                    <div>Br      14.294364702  25.162791887 
                      20.209885331</div>
                  </div>
                  <div><br>
                  </div>
                  <div>
                    <div>&INPUTPP</div>
                    <div>prefix="Reactant_ALONE"</div>
                    <div>outdir="/global/home/pcosta/PdNP"</div>
                    <div>ngauss=0</div>
                    <div>degauss=0.0</div>
                    <div>Emin=-1000</div>
                    <div>Emax=0</div>
                    <div>DeltaE=0.005</div>
                    <div>filpdos="Reactant_alone-proj"</div>
                    <div>/</div>
                  </div>
                  <div><br>
                  </div>
                  <div><br>
                  </div>
                  <div><br>
                  </div>
                  -- <br>
                  <div dir="ltr" class="gmail_signature">
                    <div dir="ltr">Paolo Costa, Ph.D.
                      <div>Postdoctoral Researcher</div>
                      <div>Department of Chemistry and Biomolecular
                        Sciences</div>
                      <div>University of Ottawa</div>
                      <div>10 Marie Curie, Ottawa, ON K1N 6N5, Canada</div>
                      <div>Room number: DRO 326 (D'Iorio Hall)</div>
                    </div>
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      <pre wrap="">_______________________________________________
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