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Dear all,
  When I prepare a KSS file for a GW calculation. I always meet a memory 
problem. It shows such information at the end of log file.

For abinis compiled with PGI:

“......
Opening file for KS structure output: sbo_KSS
 number of Gamma centered plane waves   3001
 number of Gamma centered shells    754
 number of bands   3001
 maximum angular momentum components      3
 number of symmetry operations  4 (without in0: ALLOCATE: 1483372704 bytes 
requested; not enough memorythe following problem.”

For abinis compiled with Intel fortran IFC:

“......
Opening file for KS structure output: sbo_KSS
 number of Gamma centered plane waves  29981
 number of Gamma centered shells   7503
 number of bands  26808
 maximum angular momentum components      3
 number of symmetry operations  4 (without inversion)
   *   g( 1)=  0  0  0
   *   g( 2)=  1  0  0
   *   g( 3)=  0 -1  0
   *   g( 4)= -1  0  0
   *   g( 5)=  0  1  0
   *   g( 6)=  1  1  0
   *   g( 7)=  1 -1  0
   *   g( 8)= -1 -1  0
   *   g(****)=-13 12  9
   *   g(****)= 12 13 -9
   *   g(****)= 13-12  9
   *   g(****)=-13-12 -9
   *   g(****)=-12 13  9
   *   g(****)= 13 12 -9
   *   g(****)= 12-13  9

 k-point   1
 Calculating <G|H|G'> elements
forrtl: severe (179): Cannot allocate array - overflow on array size 
calculation.
Image              PC        Routine            Line        Source            
 
abinis             08EA1788  Unknown               Unknown  Unknown
abinis             08EA1280  Unknown               Unknown  Unknown
......

I have tried to change nbandkss, npwkss, mffmem and mkmem parameters, but the 
problem still has. My computer has 3G memory. The input file is as follows. 
Can anyone give any suggestion? Thanks in advance.

Zeming

#----------------------------------------
#Input file
getden -1                
# Definition of parameters for the calculation of the KSS file
#--------------------------------------------------------
nbandkss  -1         # Number of bands in KSS file (-1 means the maximum 
possible)
istwfk  18*1
iscf  -2
nband 80
#----------------------------------------------------------
# Use only symmorphic operations
symmorphi 0
tolwfr  1.0d-12 

#Definition of the unit cell
acell 15.09060  15.09060  9.76535        # This is lattice constant
angdeg 90 90 90

#Definition of the atom types
ntypat 4          
znucl 38 12 14 8   
                         
#Definition of the atoms
spgroup 113 #  P-421m
chkprim=0
natom 24
brvltt=0
natrd 6
typat 1 2 3 4 4 4   
xred                                
0.33869   0.16131   0.50958 
0.00000   0.00000   0.00000 
0.13924   0.36076   0.95060 
0.50000   0.00000   0.14329 
0.14160   0.35840   0.25931 
0.07613   0.19200   0.80587 

#Definition of the planewave basis set
ecut 40  # Maximal kinetic energy cut-off, in Hartree

#Definition of the k-point grid
kptopt 1          # Option for the automatic generation of k points, taking
                  # into account the symmetry
ngkpt  4 4 4 
nshiftk 1         
shiftk 0.0 0.0 0.0

#Definition of the SCF procedure
nstep 60          # Maximal number of SCF cycles

diemac 2.0