On 06/03/18 08:17, tahsin özer wrote:

Note: The following floating-point exceptions are signalling: IEEE_UNDERFLOW_FLAG IEEE_DENORMAL
STOP 3
" error.


Dear Tahsin,
the floating-point underflow is not an error, although getting it indicates that you did not compile the code with much optimization.

The STOP 3 message is just the very end of the output (hint there are more than 3 ways for the code to fail). If you want some useful help you would have better provide the entire output, because rerunning your input file would take some time.

kind regards


p.s. you also have an inconsistent choice of ecutrho, as you are using norm-conserving pseudopotentials this parameter is typically not required, but this is not the cause of the error.





  I will be grateful to you if you can kindly guide us regarding these matters.

Thanking you,
Yours sincerely,
Tahsin

****************input file******************************************
&CONTROL
  calculation = 'vc-relax',
  prefix     = 'Para_SbSI',
  pseudo_dir = './',
  outdir     = './',
  tstress    = .true.,
  tprnfor    = .true.,
  /

&SYSTEM
  ibrav     = 8, !8 Orthorhombic,
 celldm(1) = 16.09471257417136,!A=8.517A=16.09471257417136Bohr B=10.111 C=4.094
  celldm(2) = 1.18715510156158,!b/a
  celldm(3) = 0.48068568744863,!c/a
  nat       = 12,
  ntyp      = 3,
  ecutwfc   = 70,
  ecutrho   = 700,
  occupations='smearing',
  smearing='gaussian',
  degauss=0.04,
  /

&ELECTRONS
     mixing_beta = 0.2,
  /

&ions  /
&cell cell_factor=2.3/

ATOMIC_SPECIES
  Sb 121.76     Sb.pbe-hgh.UPF
  S  32.065     S.pbe-hgh.UPF
  I  126.90447  I.pbe-hgh.UPF

ATOMIC_POSITIONS (crystal)
Sb   0.119000 0.250000 0.124000
Sb   0.381000 0.750000 0.624000
Sb   0.881000 0.750000 0.876000
Sb   0.619000 0.250000 0.376000
S    0.840000 0.250000 0.050000
S    0.660000 0.750000 0.550000
S    0.160000 0.750000 0.950000
S    0.340000 0.250000 0.450000
I    0.508000 0.250000 0.828000
I    0.992000 0.750000 0.328000
I    0.492000 0.750000 0.172000
I    0.008000 0.250000 0.672000
K_POINTS (automatic)
   4 3 8 1 1 1




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