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guoshukuan

铜虫 (小有名气)

[求助] vasp5.2运行终止

在用vasp5.2计算总能时,只输出几个能量后就不再输出了,但top查看程序还在运行,能量还是正的,不知是什么原因,请高手指点,谢谢了。INCAR和report 如下:
[lyhua@nd1 68-56]$ cat report
running on    8 nodes
distr:  one band on    1 nodes,    8 groups
vasp.5.2.8 07Jul10 complex
POSCAR found :  3 types and   96 ions
LDA part: xc-table for Pade appr. of Perdew
POSCAR, INCAR and KPOINTS ok, starting setup
WARNING: small aliasing (wrap around) errors must be expected
FFT: planning ...(           2 )
reading WAVECAR
  WARNING: DENMP: can't reach specified precision
  Number of Electrons is NELECT =   390.999999999894     
entering main loop
       N       E                     dE             d eps       ncg     rms          ort
DAV:   1     0.124385597703E+05    0.12439E+05   -0.52631E+05  7936   0.169E+03
DAV:   2     0.318507160083E+04   -0.92535E+04   -0.87912E+04  7936   0.632E+02
DAV:   3     0.943144155857E+03   -0.22419E+04   -0.21085E+04  7936   0.248E+02
DAV:   4     0.295596939558E+03   -0.64755E+03   -0.60190E+03  7936   0.137E+02
DAV:   5     0.865164910411E+02   -0.20908E+03   -0.19775E+03  7936   0.813E+01

[lyhua@nd1 68-56]$ cat INCAR



general:
System = Fe and vacancy in sigma3 GB
GGA=PS
LHFCALC= .TRUE.   ; HFSCREEN=0.2
TIME=0.4
PRECFOCK=A
ENCUT=320
ALGO=Damped   ; IALGO=53
ISTART=0   ; ICHARG=2
IBRION=1   ; SIGMA=0.1
EDIFF=0.00001   ; EDIFFG= -0.01
LWAVE= .F.   ; LREAL=Auto
NSW=60
AEXX=0.25
NELMIN=5
ISIF=2
NFREE=10
ISMEAR=0
MAGMON=93*0  2*4  1*0
VOSKOWN=0
MAXMIX=80
AMIX=0.2
BMIX=0.0001
AMIX_MAG=0.8
BMIX_MAG=0.0001
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guoshukuan

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我将TIME分别改为0.2,  0.1。 还是会报错,求指点。错误如下:
   
   [lyhua@nd1 68-56]$ cat report
running on    8 nodes
distr:  one band on    1 nodes,    8 groups
vasp.5.2.8 07Jul10 complex
POSCAR found :  3 types and   96 ions
LDA part: xc-table for Pade appr. of Perdew
POSCAR, INCAR and KPOINTS ok, starting setup
WARNING: small aliasing (wrap around) errors must be expected
FFT: planning ...(           2 )
reading WAVECAR
  WARNING: DENMP: can't reach specified precision
  Number of Electrons is NELECT =   390.999999999894     
entering main loop
       N       E                     dE             d eps       ncg     rms          ort
DAV:   1     0.124385597703E+05    0.12439E+05   -0.52631E+05  7936   0.169E+03
每天进步一点点
4楼2011-12-26 10:35:27
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liliangfang

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【答案】应助回帖

★ ★
感谢参与,应助指数 +1
WDD880227(金币+2): 谢谢交流~~~ 2011-12-26 10:48:28
GGA=PS不知道你的赝势里面改了没事,你的提示是到不到精度,算了前面几步,如果一直等下去就会出现错误提示啦,建议调低收敛精度,For the damped MD algorithm ( IALGO = 53, ALGO = Damped), a sensible TIME step is even more important. In this case TIME is not automatically adjusted, and the user is entirely responsible to chose an appropriate value. Too small time-steps slow the convergence significantly, whereas too large values will always lead to divergence. It is sensible to optimize this value, in particular, if many different configurations are considered for a particular system. It is recommended to start with a small step size TIME, and to increase TIME by a factor 1.2 until the calculations diverge. The largest stable step TIME should then be used for all calculations.
2楼2011-12-25 22:10:15
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guoshukuan

铜虫 (小有名气)

首先感谢你这么及时的回复。赝势文件改过了将 POTACR 中 LEXCH=91 改成了LEXCH=PS.  我的体系是96个原子。
  按照你的提示我再改小TIME 设置试试吧。再次感谢!
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3楼2011-12-26 08:49:52
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guoshukuan

铜虫 (小有名气)

引用回帖:
4楼: Originally posted by guoshukuan at 2011-12-26 10:35:27
我将TIME分别改为0.2,  0.1。 还是会报错,求指点。错误如下:
   
   $ cat report
running on    8 nodes
distr:  one band on    1 nodes,    8 groups
vasp.5.2.8 07Jul10 complex
POSCAR found :  ...

可能K点不够,5.2需要相对更多的K点。
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5楼2012-07-17 23:13:14
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