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I am trying to calculate the partial DOS of a large cell of MgO that contains a grain boundary. I have already optimised the cell size and relaxed the atomic coordinates. I use the optimised POSCAR with the following input:

----------------------------------------------
SYSTEM = MgO GB
ENCUT = 400
GGA = 91
IALGO = 48
LREAL= A
NELMIN = 4
BMIX=2.
MAXMIX=50

ISPIN=1
LORBIT = 10

ISYM=0
NSW = 0
IBRION = -1
ISIF=0
POTIM= 0.5
NPAR = 4

ISMEAR = 1
SIGMA= 0.1
--------------------------------------------

I get the following error on the standard output. The code does not exit and continues to run with no further output.

-------------------------------------------
running on 128 nodes
distr: one band on 32 nodes, 4 groups
vasp.4.6.26 15Dec04 gamma-only
POSCAR found : 2 types and 320 ions
LDA part: xc-table for Ceperly-Alder, standard interpolation
POSCAR, INCAR and KPOINTS ok, starting setup
WARNING: wrap around errors must be expected
FFT: planning ... 1
reading WAVECAR
internal ERROR RSPHER:running out of buffer 19184 48 8 2 19499
internal ERROR RSPHER:running out of buffer 19184 48 8 2 19499
internal ERROR RSPHER:running out of buffer 19184 48 8 2 19499
internal ERROR RSPHER:running out of buffer 19184 48 8 2 19499
internal ERROR RSPHER:running out of buffer 19440 36 8 2 19499
internal ERROR RSPHER:running out of buffer 43192 72 8 2 43310
internal ERROR RSPHER:running out of buffer 43192 72 8 2 43310
internal ERROR RSPHER:running out of buffer 30808 62 8 2 31270
internal ERROR RSPHER:running out of buffer 19440 36 8 2 19499
internal ERROR RSPHER:running out of buffer 30808 62 8 2 31270
internal ERROR RSPHER:running out of buffer 19440 36 8 2 19499
internal ERROR RSPHER:running out of buffer 19440 36 8 2 19499
internal ERROR RSPHER:running out of buffer 36768 52 8 2 36904
internal ERROR RSPHER:running out of buffer 43192 72 8 2 43310
internal ERROR RSPHER:running out of buffer 36768 52 8 2 36904
internal ERROR RSPHER:running out of buffer 30808 62 8 2 31270
internal ERROR RSPHER:running out of buffer 30808 62 8 2 31270
internal ERROR RSPHER:running out of buffer 43192 72 8 2 43310
internal ERROR RSPHER:running out of buffer 36768 52 8 2 36904
internal ERROR RSPHER:running out of buffer 36768 52 8 2 36904
internal ERROR RSPHER:running out of buffer 72440 70 8 2 72475
internal ERROR RSPHER:running out of buffer 72440 70 8 2 72475
internal ERROR RSPHER:running out of buffer 72440 70 8 2 72475
internal ERROR RSPHER:running out of buffer 72440 70 8 2 72475
--------------------------------------

I looked in the forum and there is a post that attributes this problem to a bug that has been rectified some time ago. I am running a version of VASP that should not have this bug (vasp.4.6.26). Can anyone help with this problem?

1) please check if the optimized output geometry of the structural optimization is reasonable (pressure, XDATCAR,...)
2) if it is, please do the following:
search for the following lines in nonlr.F
IF (IRMAX > NONLR_S%IRMAX) THEN
! IRMAX is the maximum global number, could be improved !!!!
NONLR_S%IRMAX =IRMAX *1.1
LREALLOCATE=.TRUE.
ENDIF
IF( IRALLOC > NONLR_S%IRALLOC) THEN
! more safety on parallel machines increase by 20 %
NONLR_S%IRALLOC =IRALLOC*1.2
LREALLOCATE=.TRUE.
ENDIF
and change
NONLR_S%IRALLOC =IRALLOC*1.1 to
NONLR_S%IRALLOC =IRALLOC*1.2
and
NONLR_S%IRALLOC =IRALLOC*1.2 to
NONLR_S%IRALLOC =IRALLOC*1.3

(or, if necessary to higher values)

and then do we have to recompile the whole software? i am facing the same error of no buffer in that file.

Of course you need to recompile the modified source code.