Dear Neelam

     bravais-lattice index     =            4
     lattice parameter (alat)  =      46.2265  a.u.
     unit-cell volume          =   86924.5388 (a.u.)^3

Your hexagonal (ibrav=4) supercell has a=46.2265 a.u. and c=46.9710 a.u., that is, a huge cell volume of 86924.5388 (a.u.)^3, as reported in your output file. Not only this huge cell requires a lot of memory, as stated in your output

Estimated max dynamical RAM per process >      11.48 GB

but your small bunch of atoms (24) is scattered in a meaningless structure around this huge cell. If you have no supervisor that can guide you, please at least check carefully with some visual editor/viewer of atomic structures (xcrysden can be a good choice) your input file before starting the calculation. 99% of weird errors depend on very wrong atomic positions.
HTH
Giuseppe

Quoting Neelam Swarnkar <[email protected]>:

output file
Program PWSCF v.6.3 starts on  7Jul2020 at 13:32:49

     This program is part of the open-source Quantum ESPRESSO suite
     for quantum simulation of materials; please cite
         "P. Giannozzi et al., J. Phys.:Condens. Matter 21 395502 (2009);
         "P. Giannozzi et al., J. Phys.:Condens. Matter 29 465901 (2017);
          URL http://www.quantum-espresso.org";,
     in publications or presentations arising from this work. More details
at
     http://www.quantum-espresso.org/quote

     Parallel version (MPI), running on     1 processors

     MPI processes distributed on     1 nodes
     Waiting for input...
     Reading input from standard input

     Current dimensions of program PWSCF are:
     Max number of different atomic species (ntypx) = 10
     Max number of k-points (npk) =  40000
     Max angular momentum in pseudopotentials (lmaxx) =  3
               file Zn.pbe-dnl-kjpaw_psl.1.0.0.UPF: wavefunction(s)  4S 3D
renormalized
               file Sb.pbe-n-kjpaw_psl.1.0.0.UPF: wavefunction(s)  5S
renormalized

     Subspace diagonalization in iterative solution of the eigenvalue
problem:
     a serial algorithm will be used

     Found symmetry operation: I + (  0.5000  0.0000  0.0000)
     This is a supercell, fractional translations are disabled

     G-vector sticks info
     --------------------
     sticks:   dense  smooth     PW     G-vecs:    dense   smooth      PW
     Sum       20017   15937   4093              2328127  1647611  215359



     bravais-lattice index     =            4
     lattice parameter (alat)  =      46.2265  a.u.
     unit-cell volume          =   86924.5388 (a.u.)^3
     number of atoms/cell      =           24
     number of atomic types    =            2
     number of electrons       =       204.00
     number of Kohn-Sham states=          102
     kinetic-energy cutoff     =      27.0000  Ry
     charge density cutoff     =     136.0000  Ry
     convergence threshold     =      1.0E-06
     mixing beta               =       0.6000
     number of iterations used =            8  plain     mixing
     Exchange-correlation      = SLA PW PBX PBC ( 1  4  3  4 0 0)

     celldm(1)=  46.226480  celldm(2)=   0.000000  celldm(3)=   1.016107
     celldm(4)=   0.000000  celldm(5)=   0.000000  celldm(6)=   0.000000

     crystal axes: (cart. coord. in units of alat)
               a(1) = (   1.000000   0.000000   0.000000 )
               a(2) = (  -0.500000   0.866025   0.000000 )
               a(3) = (   0.000000   0.000000   1.016107 )

     reciprocal axes: (cart. coord. in units 2 pi/alat)
               b(1) = (  1.000000  0.577350 -0.000000 )
               b(2) = (  0.000000  1.154701  0.000000 )
               b(3) = (  0.000000 -0.000000  0.984149 )


     PseudoPot. # 1 for Zn read from file:
     ./Zn.pbe-dnl-kjpaw_psl.1.0.0.UPF
     MD5 check sum: 7217f78799bfc6aaa3738bf4cd09bafd
     Pseudo is Projector augmented-wave + core cor, Zval = 12.0
     Generated using "atomic" code by A. Dal Corso v.6.2.2
     Shape of augmentation charge: PSQ
     Using radial grid of 1201 points,  6 beta functions with:
                l(1) =   0
                l(2) =   0
                l(3) =   1
                l(4) =   1
                l(5) =   2
                l(6) =   2
     Q(r) pseudized with 0 coefficients


     PseudoPot. # 2 for Sb read from file:
     ./Sb.pbe-n-kjpaw_psl.1.0.0.UPF
     MD5 check sum: 8701ebd98ea0ddfeeee3c5089d2d8acc
     Pseudo is Projector augmented-wave + core cor, Zval =  5.0
     Generated using "atomic" code by A. Dal Corso v.6.2.2
     Shape of augmentation charge: PSQ
     Using radial grid of 1243 points,  6 beta functions with:
                l(1) =   0
                l(2) =   0
                l(3) =   1
                l(4) =   1
                l(5) =   2
                l(6) =   2
     Q(r) pseudized with 0 coefficients


     atomic species   valence    mass     pseudopotential
        Zn            12.00    60.00000     Zn( 1.00)
        Sb             5.00   102.00000     Sb( 1.00)

     No symmetry found



   Cartesian axes

     site n.     atom                  positions (alat units)
         1           Zn  tau(   1) = (   0.0669875   0.7499997   0.0163664
 )
         2           Zn  tau(   2) = (  -0.4330125   0.7499997   0.0163664
 )
         3           Zn  tau(   3) = (   0.5080535   0.0000000   0.8799737
 )
         4           Zn  tau(   4) = (   0.0080535   0.0000000   0.8799737
 )
         5           Zn  tau(   5) = (   0.4249590   0.0139491   0.0000000
 )
         6           Zn  tau(   6) = (   0.9249590   0.0139491   0.0000000
 )
         7           Zn  tau(   7) = (   0.5669875   0.4330127   0.4916869
 )
         8           Zn  tau(   8) = (   0.0669875   0.4330127   0.4916869
 )
         9           Zn  tau(   9) = (   0.4249590   0.5490385   0.5080533
 )
        10           Zn  tau(  10) = (  -0.0750410   0.5490385   0.5080533
 )
        11           Zn  tau(  11) = (   0.5080535   0.4190636   0.6441862
 )
        12           Zn  tau(  12) = (   0.0080535   0.4190636   0.6441862
 )
        13           Sb  tau(  13) = (   0.4330125   0.1160258   0.9997402
 )
        14           Sb  tau(  14) = (  -0.0669875   0.1160258   0.9997402
 )
        15           Sb  tau(  15) = (   0.4919465   0.0000000   0.1361329
 )
        16           Sb  tau(  16) = (   0.9919465   0.0000000   0.1361329
 )
        17           Sb  tau(  17) = (   0.0750410   0.8520763   0.0000000
 )
        18           Sb  tau(  18) = (  -0.4249590   0.8520763   0.0000000
 )
        19           Sb  tau(  19) = (  -0.0669875   0.4330127   0.5244197
 )
        20           Sb  tau(  20) = (   0.4330125   0.4330127   0.5244197
 )
        21           Sb  tau(  21) = (   0.0750410   0.3169869   0.5080533
 )
        22           Sb  tau(  22) = (   0.5750410   0.3169869   0.5080533
 )
        23           Sb  tau(  23) = (  -0.0080535   0.4469618   0.3719204
 )
        24           Sb  tau(  24) = (   0.4919465   0.4469618   0.3719204
 )

     number of k points=     4
                       cart. coord. in units 2pi/alat
        k(    1) = (   0.0000000   0.0000000   0.0000000), wk =   1.0000000
        k(    2) = (  -0.5000000  -0.2886751   0.0000000), wk =   0.3333333
        k(    3) = (   0.5000000  -0.2886751   0.0000000), wk =   0.3333333
        k(    4) = (   0.0000000  -0.5773503   0.0000000), wk =   0.3333333

     Dense  grid:  2328127 G-vectors     FFT dimensions: ( 180, 180, 180)

     Smooth grid:  1647611 G-vectors     FFT dimensions: ( 160, 160, 160)

     Estimated max dynamical RAM per process >      11.17 GB

     Check: negative/imaginary core charge=   -0.000002    0.000000

     Initial potential from superposition of free atoms
     Check: negative starting charge=   -0.128417

     starting charge  203.94778, renormalised to  204.00000

On Tue, Jul 7, 2020 at 1:47 PM Neelam Swarnkar <[email protected]>
wrote:

input file
&control
    calculation = 'scf',
    prefix = 'Zn4Sb3_exc1',
    outdir = './tmp/'
    pseudo_dir = './'
    verbosity = 'low'

 /
 &system
    ibrav =  4,
    celldm(1)= 46.2264804,
    celldm(3)= 1.016106614,
    nat =  24,
    ntyp = 2,

    ecutwfc = 27,
    ecutrho = 136

 /
 &electrons
    mixing_beta = 0.6
 /

 ATOMIC_SPECIES
 Zn 60.00  Zn.pbe-dnl-kjpaw_psl.1.0.0.UPF
 Sb 102.00 Sb.pbe-n-kjpaw_psl.1.0.0.UPF


ATOMIC_POSITIONS {crystal}
 Zn   0.5000000000000000  0.8660250000000000  0.0161070000000001
 Zn   0.0000000000000000  0.8660250000000000  0.0161070000000001
 Zn   0.5080535000000000  0.0000000000000000  0.8660250000000000
 Zn   0.0080534999999999  0.0000000000000000  0.8660250000000000
 Zn   0.4330125000000000  0.0161070000000001  0.0000000000000000
 Zn   0.9330125000000000  0.0161070000000001  0.0000000000000000
 Zn   0.8169875000000000  0.5000000000000000  0.4838930000000000
 Zn   0.3169875000000000  0.5000000000000000  0.4838930000000000
 Zn   0.7419465000000001  0.6339750000000000  0.5000000000000000
 Zn   0.2419465000000000  0.6339750000000000  0.5000000000000000
 Zn   0.7500000000000000  0.4838930000000000  0.6339750000000000
 Zn   0.2500000000000000  0.4838930000000000  0.6339750000000000
 Sb   0.5000000000000000  0.1339750000000000  0.9838929999999999
 Sb   0.0000000000000000  0.1339750000000000  0.9838929999999999
 Sb   0.4919465000000000  0.0000000000000000  0.1339750000000000
 Sb   0.9919465000000000  0.0000000000000000  0.1339750000000000
 Sb   0.5669875000000000  0.9838929999999999  0.0000000000000000
 Sb   0.0669875000000000  0.9838929999999999  0.0000000000000000
 Sb   0.1830125000000000  0.5000000000000000  0.5161070000000000
 Sb   0.6830125000000000  0.5000000000000000  0.5161070000000000
 Sb   0.2580535000000000  0.3660250000000000  0.5000000000000000
 Sb   0.7580534999999999  0.3660250000000000  0.5000000000000000
 Sb   0.2500000000000000  0.5161070000000000  0.3660250000000000
 Sb   0.7500000000000000  0.5161070000000000  0.3660250000000000


K_POINTS (automatic)
 2 1 1 0 0 0

On Tue, Jul 7, 2020 at 1:28 PM Neelam Swarnkar <[email protected]>
wrote:


output file

This program is part of the open-source Quantum ESPRESSO suite
     for quantum simulation of materials; please cite
         "P. Giannozzi et al., J. Phys.:Condens. Matter 21 395502 (2009);
         "P. Giannozzi et al., J. Phys.:Condens. Matter 29 465901 (2017);
          URL http://www.quantum-espresso.org";,
     in publications or presentations arising from this work. More
details at
     http://www.quantum-espresso.org/quote

     Parallel version (MPI), running on     1 processors

     MPI processes distributed on     1 nodes
     Waiting for input...
     Reading input from standard input

     Current dimensions of program PWSCF are:
     Max number of different atomic species (ntypx) = 10
     Max number of k-points (npk) =  40000
     Max angular momentum in pseudopotentials (lmaxx) =  3
               file Zn.pbe-dnl-kjpaw_psl.1.0.0.UPF: wavefunction(s)  4S
3D renormalized
               file Sb.pbe-n-kjpaw_psl.1.0.0.UPF: wavefunction(s)  5S
renormalized

     Subspace diagonalization in iterative solution of the eigenvalue
problem:
     a serial algorithm will be used

     Found symmetry operation: I + (  0.5000  0.0000  0.0000)
     This is a supercell, fractional translations are disabled

     G-vector sticks info
     --------------------
     sticks:   dense  smooth     PW     G-vecs:    dense   smooth      PW
     Sum       20017   15937   4093              2328127  1647611  215359



     bravais-lattice index     =            4
     lattice parameter (alat)  =      46.2265  a.u.
     unit-cell volume          =   86924.5388 (a.u.)^3
     number of atoms/cell      =           24
     number of atomic types    =            2
     number of electrons       =       204.00
     number of Kohn-Sham states=          122
     kinetic-energy cutoff     =      27.0000  Ry
     charge density cutoff     =     136.0000  Ry
     convergence threshold     =      1.0E-06
     mixing beta               =       0.6000
     number of iterations used =            8  plain     mixing
     Exchange-correlation      = SLA PW PBX PBC ( 1  4  3  4 0 0)

     celldm(1)=  46.226480  celldm(2)=   0.000000  celldm(3)=   1.016107
     celldm(4)=   0.000000  celldm(5)=   0.000000  celldm(6)=   0.000000

     crystal axes: (cart. coord. in units of alat)
               a(1) = (   1.000000   0.000000   0.000000 )
               a(2) = (  -0.500000   0.866025   0.000000 )
               a(3) = (   0.000000   0.000000   1.016107 )

     reciprocal axes: (cart. coord. in units 2 pi/alat)
               b(1) = (  1.000000  0.577350 -0.000000 )
               b(2) = (  0.000000  1.154701  0.000000 )
               b(3) = (  0.000000 -0.000000  0.984149 )


     PseudoPot. # 1 for Zn read from file:
     ./Zn.pbe-dnl-kjpaw_psl.1.0.0.UPF
     MD5 check sum: 7217f78799bfc6aaa3738bf4cd09bafd
     Pseudo is Projector augmented-wave + core cor, Zval = 12.0
     Generated using "atomic" code by A. Dal Corso v.6.2.2
     Shape of augmentation charge: PSQ
     Using radial grid of 1201 points,  6 beta functions with:
                l(1) =   0
                l(2) =   0
                l(3) =   1
                l(4) =   1
                l(5) =   2
                l(6) =   2
     Q(r) pseudized with 0 coefficients


     PseudoPot. # 2 for Sb read from file:
     ./Sb.pbe-n-kjpaw_psl.1.0.0.UPF
     MD5 check sum: 8701ebd98ea0ddfeeee3c5089d2d8acc
     Pseudo is Projector augmented-wave + core cor, Zval =  5.0
     Generated using "atomic" code by A. Dal Corso v.6.2.2
     Shape of augmentation charge: PSQ
     Using radial grid of 1243 points,  6 beta functions with:
                l(1) =   0
                l(2) =   0
                l(3) =   1
                l(4) =   1
                l(5) =   2
                l(6) =   2
     Q(r) pseudized with 0 coefficients


     atomic species   valence    mass     pseudopotential
        Zn            12.00    60.00000     Zn( 1.00)
        Sb             5.00   102.00000     Sb( 1.00)

     No symmetry found



   Cartesian axes

     site n.     atom                  positions (alat units)
         1           Zn  tau(   1) = (   0.0669875   0.7499997
0.0163664  )
         2           Zn  tau(   2) = (  -0.4330125   0.7499997
0.0163664  )
         3           Zn  tau(   3) = (   0.5080535   0.0000000
0.8799737  )
         4           Zn  tau(   4) = (   0.0080535   0.0000000
0.8799737  )
         5           Zn  tau(   5) = (   0.4249590   0.0139491
0.0000000  )
         6           Zn  tau(   6) = (   0.9249590   0.0139491
0.0000000  )
         7           Zn  tau(   7) = (   0.5669875   0.4330127
0.4916869  )
         8           Zn  tau(   8) = (   0.0669875   0.4330127
0.4916869  )
         9           Zn  tau(   9) = (   0.4249590   0.5490385
0.5080533  )
        10           Zn  tau(  10) = (  -0.0750410   0.5490385
0.5080533  )
        11           Zn  tau(  11) = (   0.5080535   0.4190636
0.6441862  )
        12           Zn  tau(  12) = (   0.0080535   0.4190636
0.6441862  )
        13           Sb  tau(  13) = (   0.4330125   0.1160258
0.9997402  )
        14           Sb  tau(  14) = (  -0.0669875   0.1160258
0.9997402  )
        15           Sb  tau(  15) = (   0.4919465   0.0000000
0.1361329  )
        16           Sb  tau(  16) = (   0.9919465   0.0000000
0.1361329  )
        17           Sb  tau(  17) = (   0.0750410   0.8520763
0.0000000  )
        18           Sb  tau(  18) = (  -0.4249590   0.8520763
0.0000000  )
        19           Sb  tau(  19) = (  -0.0669875   0.4330127
0.5244197  )
        20           Sb  tau(  20) = (   0.4330125   0.4330127
0.5244197  )
        21           Sb  tau(  21) = (   0.0750410   0.3169869
0.5080533  )
        22           Sb  tau(  22) = (   0.5750410   0.3169869
0.5080533  )
        23           Sb  tau(  23) = (  -0.0080535   0.4469618
0.3719204  )
        24           Sb  tau(  24) = (   0.4919465   0.4469618
0.3719204  )

     number of k points=     4  gaussian smearing, width (Ry)=  0.0200
                       cart. coord. in units 2pi/alat
        k(    1) = (   0.0000000   0.0000000   0.0000000), wk =
1.0000000
        k(    2) = (  -0.5000000  -0.2886751   0.0000000), wk =
0.3333333
        k(    3) = (   0.5000000  -0.2886751   0.0000000), wk =
0.3333333
        k(    4) = (   0.0000000  -0.5773503   0.0000000), wk =
0.3333333

     Dense  grid:  2328127 G-vectors     FFT dimensions: ( 180, 180, 180)

     Smooth grid:  1647611 G-vectors     FFT dimensions: ( 160, 160, 160)

     Estimated max dynamical RAM per process >      11.48 GB

     Check: negative/imaginary core charge=   -0.000002    0.000000

     Initial potential from superposition of free atoms
     Check: negative starting charge=   -0.128417

On Tue, Jul 7, 2020 at 1:27 PM Neelam Swarnkar <
[email protected]> wrote:

Dear Expert and all

Here i am sharing my input file
&control
    calculation = 'scf',
    prefix = 'Zn4Sb3_exc1',
    outdir = './tmp/'
    pseudo_dir = './'
    verbosity = 'low'

 /
 &system
    ibrav =  4,
    celldm(1)= 46.2264804,
    celldm(3)= 1.016106614,
    nat =  24,
    ntyp = 2,
    occupations='smearing', degauss=0.02,
    ecutwfc = 27,
    ecutrho = 136

 /
 &electrons
    mixing_beta = 0.6
 /

 ATOMIC_SPECIES
 Zn 60.00  Zn.pbe-dnl-kjpaw_psl.1.0.0.UPF
 Sb 102.00 Sb.pbe-n-kjpaw_psl.1.0.0.UPF


ATOMIC_POSITIONS {crystal}
 Zn   0.5000000000000000  0.8660250000000000  0.0161070000000001
 Zn   0.0000000000000000  0.8660250000000000  0.0161070000000001
 Zn   0.5080535000000000  0.0000000000000000  0.8660250000000000
 Zn   0.0080534999999999  0.0000000000000000  0.8660250000000000
 Zn   0.4330125000000000  0.0161070000000001  0.0000000000000000
 Zn   0.9330125000000000  0.0161070000000001  0.0000000000000000
 Zn   0.8169875000000000  0.5000000000000000  0.4838930000000000
 Zn   0.3169875000000000  0.5000000000000000  0.4838930000000000
 Zn   0.7419465000000001  0.6339750000000000  0.5000000000000000
 Zn   0.2419465000000000  0.6339750000000000  0.5000000000000000
 Zn   0.7500000000000000  0.4838930000000000  0.6339750000000000
 Zn   0.2500000000000000  0.4838930000000000  0.6339750000000000
 Sb   0.5000000000000000  0.1339750000000000  0.9838929999999999
 Sb   0.0000000000000000  0.1339750000000000  0.9838929999999999
 Sb   0.4919465000000000  0.0000000000000000  0.1339750000000000
 Sb   0.9919465000000000  0.0000000000000000  0.1339750000000000
 Sb   0.5669875000000000  0.9838929999999999  0.0000000000000000
 Sb   0.0669875000000000  0.9838929999999999  0.0000000000000000
 Sb   0.1830125000000000  0.5000000000000000  0.5161070000000000
 Sb   0.6830125000000000  0.5000000000000000  0.5161070000000000
 Sb   0.2580535000000000  0.3660250000000000  0.5000000000000000
 Sb   0.7580534999999999  0.3660250000000000  0.5000000000000000
 Sb   0.2500000000000000  0.5161070000000000  0.3660250000000000
 Sb   0.7500000000000000  0.5161070000000000  0.3660250000000000


K_POINTS (automatic)
 2 1 1 0 0 0

On Mon, Jul 6, 2020 at 5:49 PM Neelam Swarnkar <
[email protected]> wrote:

I am sharing my input and output files here. also the screenshot of
error .

input file

&control
    calculation = 'scf',
    prefix = 'Zn4Sb3_exc1',
    outdir = './tmp/'
    pseudo_dir = './'
    verbosity = 'low'

 /
 &system
    ibrav =  4,
    celldm(1)= 46.2264804,
    celldm(3)= 1.016106614,
    nat =  24,
    ntyp = 2,
    occupations='smearing', degauss=0.02,
    ecutwfc = 27,
    ecutrho = 136

 /
 &electrons
    mixing_beta = 0.6
 /

 ATOMIC_SPECIES
 Zn 60.00  Zn.pbe-dnl-kjpaw_psl.1.0.0.UPF
 Sb 102.00 Sb.pbe-n-kjpaw_psl.1.0.0.UPF


ATOMIC_POSITIONS {crystal}
 Zn   0.5000000000000000  0.8660250000000000  0.0161070000000001
 Zn   0.0000000000000000  0.8660250000000000  0.0161070000000001
 Zn   0.5080535000000000  0.0000000000000000  0.8660250000000000
 Zn   0.0080534999999999  0.0000000000000000  0.8660250000000000
 Zn   0.4330125000000000  0.0161070000000001  0.0000000000000000
 Zn   0.9330125000000000  0.0161070000000001  0.0000000000000000
 Zn   0.8169875000000000  0.5000000000000000  0.4838930000000000
 Zn   0.3169875000000000  0.5000000000000000  0.4838930000000000
 Zn   0.7419465000000001  0.6339750000000000  0.5000000000000000
 Zn   0.2419465000000000  0.6339750000000000  0.5000000000000000
 Zn   0.7500000000000000  0.4838930000000000  0.6339750000000000
 Zn   0.2500000000000000  0.4838930000000000  0.6339750000000000
 Sb   0.5000000000000000  0.1339750000000000  0.9838929999999999
 Sb   0.0000000000000000  0.1339750000000000  0.9838929999999999
 Sb   0.4919465000000000  0.0000000000000000  0.1339750000000000
 Sb   0.9919465000000000  0.0000000000000000  0.1339750000000000
 Sb   0.5669875000000000  0.9838929999999999  0.0000000000000000
 Sb   0.0669875000000000  0.9838929999999999  0.0000000000000000
 Sb   0.1830125000000000  0.5000000000000000  0.5161070000000000
 Sb   0.6830125000000000  0.5000000000000000  0.5161070000000000
 Sb   0.2580535000000000  0.3660250000000000  0.5000000000000000
 Sb   0.7580534999999999  0.3660250000000000  0.5000000000000000
 Sb   0.2500000000000000  0.5161070000000000  0.3660250000000000
 Sb   0.7500000000000000  0.5161070000000000  0.3660250000000000


K_POINTS (automatic)
 2 1 1 0 0 0


output
Program PWSCF v.6.3 starts on  6Jul2020 at 14:29:48

     This program is part of the open-source Quantum ESPRESSO suite
     for quantum simulation of materials; please cite
         "P. Giannozzi et al., J. Phys.:Condens. Matter 21 395502
(2009);
         "P. Giannozzi et al., J. Phys.:Condens. Matter 29 465901
(2017);
          URL http://www.quantum-espresso.org";,
     in publications or presentations arising from this work. More
details at
     http://www.quantum-espresso.org/quote

     Parallel version (MPI), running on     1 processors

     MPI processes distributed on     1 nodes
     Waiting for input...
     Reading input from standard input

     Current dimensions of program PWSCF are:
     Max number of different atomic species (ntypx) = 10
     Max number of k-points (npk) =  40000
     Max angular momentum in pseudopotentials (lmaxx) =  3
               file Zn.pbe-dnl-kjpaw_psl.1.0.0.UPF: wavefunction(s)  4S
3D renormalized
               file Sb.pbe-n-kjpaw_psl.1.0.0.UPF: wavefunction(s)  5S
renormalized

     Subspace diagonalization in iterative solution of the eigenvalue
problem:
     a serial algorithm will be used

     Found symmetry operation: I + (  0.5000  0.0000  0.0000)
     This is a supercell, fractional translations are disabled

     G-vector sticks info
     --------------------
     sticks:   dense  smooth     PW     G-vecs:    dense   smooth
 PW
     Sum       20017   15937   4093              2328127  1647611
 215359



     bravais-lattice index     =            4
     lattice parameter (alat)  =      46.2265  a.u.
     unit-cell volume          =   86924.5388 (a.u.)^3
     number of atoms/cell      =           24
     number of atomic types    =            2
     number of electrons       =       204.00
     number of Kohn-Sham states=          122
     kinetic-energy cutoff     =      27.0000  Ry
     charge density cutoff     =     136.0000  Ry
     convergence threshold     =      1.0E-06
     mixing beta               =       0.6000
     number of iterations used =            8  plain     mixing
     Exchange-correlation      = SLA PW PBX PBC ( 1  4  3  4 0 0)

     celldm(1)=  46.226480  celldm(2)=   0.000000  celldm(3)=   1.016107
     celldm(4)=   0.000000  celldm(5)=   0.000000  celldm(6)=   0.000000

     crystal axes: (cart. coord. in units of alat)
               a(1) = (   1.000000   0.000000   0.000000 )
               a(2) = (  -0.500000   0.866025   0.000000 )
               a(3) = (   0.000000   0.000000   1.016107 )

     reciprocal axes: (cart. coord. in units 2 pi/alat)
               b(1) = (  1.000000  0.577350 -0.000000 )
               b(2) = (  0.000000  1.154701  0.000000 )
               b(3) = (  0.000000 -0.000000  0.984149 )


     PseudoPot. # 1 for Zn read from file:
     ./Zn.pbe-dnl-kjpaw_psl.1.0.0.UPF
     MD5 check sum: 7217f78799bfc6aaa3738bf4cd09bafd
     Pseudo is Projector augmented-wave + core cor, Zval = 12.0
     Generated using "atomic" code by A. Dal Corso v.6.2.2
     Shape of augmentation charge: PSQ
     Using radial grid of 1201 points,  6 beta functions with:
                l(1) =   0
                l(2) =   0
                l(3) =   1
                l(4) =   1
                l(5) =   2
                l(6) =   2
     Q(r) pseudized with 0 coefficients


     PseudoPot. # 2 for Sb read from file:
     ./Sb.pbe-n-kjpaw_psl.1.0.0.UPF
     MD5 check sum: 8701ebd98ea0ddfeeee3c5089d2d8acc
     Pseudo is Projector augmented-wave + core cor, Zval =  5.0
     Generated using "atomic" code by A. Dal Corso v.6.2.2
     Shape of augmentation charge: PSQ
     Using radial grid of 1243 points,  6 beta functions with:
                l(1) =   0
                l(2) =   0
                l(3) =   1
                l(4) =   1
                l(5) =   2
                l(6) =   2
     Q(r) pseudized with 0 coefficients


     atomic species   valence    mass     pseudopotential
        Zn            12.00    60.00000     Zn( 1.00)
        Sb             5.00   102.00000     Sb( 1.00)

     No symmetry found



   Cartesian axes

     site n.     atom                  positions (alat units)
         1           Zn  tau(   1) = (   0.0669875   0.7499997
0.0163664  )
         2           Zn  tau(   2) = (  -0.4330125   0.7499997
0.0163664  )
         3           Zn  tau(   3) = (   0.5080535   0.0000000
0.8799737  )
         4           Zn  tau(   4) = (   0.0080535   0.0000000
0.8799737  )
         5           Zn  tau(   5) = (   0.4249590   0.0139491
0.0000000  )
         6           Zn  tau(   6) = (   0.9249590   0.0139491
0.0000000  )
         7           Zn  tau(   7) = (   0.5669875   0.4330127
0.4916869  )
         8           Zn  tau(   8) = (   0.0669875   0.4330127
0.4916869  )
         9           Zn  tau(   9) = (   0.4249590   0.5490385
0.5080533  )
        10           Zn  tau(  10) = (  -0.0750410   0.5490385
0.5080533  )
        11           Zn  tau(  11) = (   0.5080535   0.4190636
0.6441862  )
        12           Zn  tau(  12) = (   0.0080535   0.4190636
0.6441862  )
        13           Sb  tau(  13) = (   0.4330125   0.1160258
0.9997402  )
        14           Sb  tau(  14) = (  -0.0669875   0.1160258
0.9997402  )
        15           Sb  tau(  15) = (   0.4919465   0.0000000
0.1361329  )
        16           Sb  tau(  16) = (   0.9919465   0.0000000
0.1361329  )
        17           Sb  tau(  17) = (   0.0750410   0.8520763
0.0000000  )
        18           Sb  tau(  18) = (  -0.4249590   0.8520763
0.0000000  )
        19           Sb  tau(  19) = (  -0.0669875   0.4330127
0.5244197  )
        20           Sb  tau(  20) = (   0.4330125   0.4330127
0.5244197  )
        21           Sb  tau(  21) = (   0.0750410   0.3169869
0.5080533  )
        22           Sb  tau(  22) = (   0.5750410   0.3169869
0.5080533  )
        23           Sb  tau(  23) = (  -0.0080535   0.4469618
0.3719204  )
        24           Sb  tau(  24) = (   0.4919465   0.4469618
0.3719204  )

     number of k points=     4  gaussian smearing, width (Ry)=  0.0200
                       cart. coord. in units 2pi/alat
        k(    1) = (   0.0000000   0.0000000   0.0000000), wk =
1.0000000
        k(    2) = (  -0.5000000  -0.2886751   0.0000000), wk =
0.3333333
        k(    3) = (   0.5000000  -0.2886751   0.0000000), wk =
0.3333333
        k(    4) = (   0.0000000  -0.5773503   0.0000000), wk =
0.3333333

     Dense  grid:  2328127 G-vectors     FFT dimensions: ( 180, 180,
180)

     Smooth grid:  1647611 G-vectors     FFT dimensions: ( 160, 160,
160)

     Estimated max dynamical RAM per process >      11.48 GB

     Check: negative/imaginary core charge=   -0.000002    0.000000

     Initial potential from superposition of free atoms
     Check: negative starting charge=   -0.128417


On Mon, Jul 6, 2020 at 3:39 PM Oleksandr Motornyi <
[email protected]> wrote:

Dear Neelam

Other than this, it would be useful if you could also show the
in/output files of your system. While it does not seem large the memory
usage depends on the atoms/pseudopotentials you are using, size of the
vacuum (if any).

Best

Oleksandr
On 06/07/2020 11:52, Michal Krompiec wrote:

Dear Neelam,
I am by no means an expert, but from my limited experience I can say
that 4GB of RAM is not a lot, to put it mildly - but at the same time, your
system isn't large. In this case, I wouldn't use any parallelization on
k-points (pw.x -npool 1) and make use of symmetry as much as possible
(correct ibrav instead of ibrav=0). You can save memory by reducing ecutwfc (at the expense of accuracy) - so try choosing pseudopotentials which give
you desired accuracy at the lowest ecutwfc (use
https://www.materialscloud.org/discover/sssp to guide you).
Best,
Michal

On Mon, 6 Jul 2020 at 10:27, Neelam Swarnkar <
[email protected]> wrote:

Dear expert and all

I am making the supercell of 2x1x1 total 24 no of atoms, and perform
scf calculation .but there is memory related problem currently i am using
4gb RAM.

What can i do to solve this problem?

Thanks in advance
Neelam

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--
Oleksandr Motornyi
PhD, Data Scientist

France

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GIUSEPPE MATTIOLI
CNR - ISTITUTO DI STRUTTURA DELLA MATERIA
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I-00015 - Monterotondo Scalo (RM)
Mob (*preferred*) +39 373 7305625
Tel + 39 06 90672342 - Fax +39 06 90672316
E-mail: <[email protected]>

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