[gmx-users] Steepest LINCS WARNING

maggin maggin.chen at gmail.com
Sat Jun 8 05:47:32 CEST 2013


Hi, all 

when I use: 

grompp -f em_constrain.mdp -c provin_solv_ion.pdb -p provin_1dxo.top -o
bovin_em.tpr 
mdrun -v -s bovin_em.tpr -nt 2 -deffnm em_constrain 

get the result: 

Steepest Descents: 
   Tolerance (Fmax)   =  1.00000e+03 
   Number of steps    =         2000 
Step=    0, Dmax= 1.0e-02 nm, Epot= -3.50527e+05 Fmax= 1.98713e+04, atom=
21002 
Step=    1, Dmax= 1.0e-02 nm, Epot= -3.68529e+05 Fmax= 9.78841e+03, atom=
3050 
Step=    2, Dmax= 1.2e-02 nm, Epot= -3.87513e+05 Fmax= 5.86618e+03, atom=
1142 
Step=    3, Dmax= 1.4e-02 nm, Epot= -4.04229e+05 Fmax= 3.50892e+03, atom=
1142 
Step=    4, Dmax= 1.7e-02 nm, Epot= -4.20673e+05 Fmax= 1.79695e+03, atom=
29070 
Step=    5, Dmax= 2.1e-02 nm, Epot= -4.39433e+05 Fmax= 1.41541e+03, atom=
29070 
Step=    6, Dmax= 2.5e-02 nm, Epot= -4.54148e+05 Fmax= 3.62694e+03, atom=
919 
Step=    7, Dmax= 3.0e-02 nm, Epot= -4.58532e+05 Fmax= 4.18232e+03, atom=
919 

Step 8, time 0.016 (ps)  LINCS WARNING 
relative constraint deviation after LINCS: 
rms 0.002283, max 0.104367 (between atoms 919 and 920) 
bonds that rotated more than 30 degrees: 
 atom 1 atom 2  angle  previous, current, constraint length 
    917    919   32.2    0.1385   0.1443      0.1340 
    919    923   32.9    0.1382   0.1442      0.1340 
    919    920   39.7    0.1385   0.1480      0.1340 
    920    921   33.9    0.1014   0.1067      0.1000 
Step=    8, Dmax= 3.6e-02 nm, Epot= -4.60091e+05 Fmax= 6.02658e+03, atom= 31 

Step 9, time 0.018 (ps)  LINCS WARNING 
relative constraint deviation after LINCS: 
rms 0.004622, max 0.121975 (between atoms 371 and 375) 
bonds that rotated more than 30 degrees: 
 atom 1 atom 2  angle  previous, current, constraint length 

Step 9, time 0.018 (ps)  LINCS WARNING 
relative constraint deviation after LINCS: 
rms 0.005013, max 0.133287 (between atoms 34 and 38) 
bonds that rotated more than 30 degrees: 
 atom 1 atom 2  angle  previous, current, constraint length 
    425    429   30.4    0.1400   0.1479      0.1390 
    429    431   30.3    0.1399   0.1481      0.1390 
    422    425   30.6    0.1400   0.1477      0.1390 
    422    423   30.7    0.1400   0.1478      0.1390 
     34     38   40.6    0.1428   0.1575      0.1390 
    427    431   30.9    0.1399   0.1482      0.1390 
     38     40   39.9    0.1425   0.1563      0.1390 
     31     34   39.9    0.1430   0.1566      0.1390 
     31     32   38.9    0.1430   0.1552      0.1390 
     32     36   38.7    0.1426   0.1556      0.1390 
     36     40   39.0    0.1422   0.1557      0.1390 
    259    261   35.0    0.1403   0.1518      0.1390 
    252    255   35.6    0.1406   0.1516      0.1390 
    423    427   30.9    0.1400   0.1482      0.1390 
    252    253   35.4    0.1406   0.1516      0.1390 
    253    257   34.7    0.1405   0.1517      0.1390 
    255    259   35.3    0.1405   0.1520      0.1390 
    257    261   34.6    0.1404   0.1516      0.1390 
   1102   1106   36.1    0.1407   0.1530      0.1390 
   1106   1108   35.8    0.1407   0.1526      0.1390 
   1099   1102   36.0    0.1408   0.1523      0.1390 
   1099   1100   35.4    0.1408   0.1518      0.1390 
   1100   1104   36.0    0.1407   0.1528      0.1390 
   1104   1108   36.3    0.1406   0.1529      0.1390 
    366    369   38.0    0.1461   0.1540      0.1390 
    366    367   38.2    0.1462   0.1546      0.1390 
    367    371   39.9    0.1456   0.1558      0.1390 
    369    373   39.1    0.1455   0.1548      0.1390 
    371    375   41.1    0.1442   0.1560      0.1390 
    373    375   40.5    0.1440   0.1555      0.1390 
    917    919   30.6    0.1443   0.1434      0.1340 
    919    923   30.4    0.1442   0.1438      0.1340 
    919    920   40.5    0.1480   0.1482      0.1340 
    920    922   35.4    0.1064   0.1071      0.1000 
    920    921   35.8    0.1067   0.1073      0.1000 
Step=   10, Dmax= 2.1e-02 nm, Epot= -4.64146e+05 Fmax= 3.09226e+03, atom=
1016 
Step=   11, Dmax= 2.6e-02 nm, Epot= -4.64176e+05 Fmax= 6.03740e+03, atom=
252 
Step=   12, Dmax= 3.1e-02 nm, Epot= -4.66478e+05 Fmax= 5.71954e+03, atom=
582 

Step 13, time 0.026 (ps)  LINCS WARNING 
relative constraint deviation after LINCS: 
rms 0.004522, max 0.099878 (between atoms 273 and 277) 
bonds that rotated more than 30 degrees: 
 atom 1 atom 2  angle  previous, current, constraint length 

Step 13, time 0.026 (ps)  LINCS WARNING 
relative constraint deviation after LINCS: 
rms 0.005964, max 0.095520 (between atoms 582 and 585) 
bonds that rotated more than 30 degrees: 
 atom 1 atom 2  angle  previous, current, constraint length 
    425    429   33.0    0.1457   0.1506      0.1390 
    429    431   33.0    0.1459   0.1503      0.1390 
    422    425   32.8    0.1456   0.1504      0.1390 
    422    423   33.2    0.1458   0.1508      0.1390 
    259    261   33.4    0.1463   0.1507      0.1390 
    252    255   34.5    0.1465   0.1518      0.1390 
    252    253   34.3    0.1465   0.1517      0.1390 
    253    257   33.8    0.1464   0.1515      0.1390 
    255    259   33.8    0.1466   0.1515      0.1390 
    257    261   33.6    0.1462   0.1508      0.1390 
     34     38   32.7    0.1427   0.1501      0.1390 
    427    431   33.0    0.1461   0.1505      0.1390 
     38     40   31.8    0.1426   0.1493      0.1390 
     31     34   33.2    0.1425   0.1501      0.1390 
     31     32   33.0    0.1421   0.1501      0.1390 
     32     36   32.8    0.1423   0.1498      0.1390 
     36     40   32.1    0.1424   0.1488      0.1390 
    423    427   33.5    0.1461   0.1511      0.1390 
    440    443   34.6    0.1434   0.1513      0.1390 
    440    441   34.6    0.1434   0.1513      0.1390 
    441    445   34.0    0.1432   0.1515      0.1390 
    445    449   34.3    0.1432   0.1509      0.1390 
    582    585   35.3    0.1436   0.1523      0.1390 
    582    583   35.9    0.1436   0.1521      0.1390 
    443    447   33.6    0.1433   0.1513      0.1390 
    583    587   35.0    0.1433   0.1520      0.1390 
    585    589   34.0    0.1434   0.1515      0.1390 
    587    591   33.7    0.1432   0.1513      0.1390 
    160    164   34.1    0.1427   0.1518      0.1390 
    162    166   33.1    0.1427   0.1512      0.1390 
    589    591   33.2    0.1433   0.1507      0.1390 
    164    168   34.2    0.1428   0.1509      0.1390 
   1017   1021   34.3    0.1466   0.1516      0.1390 
    166    168   34.0    0.1427   0.1507      0.1390 
    447    449   33.8    0.1433   0.1506      0.1390 
    270    273   35.4    0.1448   0.1520      0.1390 
    270    271   35.1    0.1443   0.1526      0.1390 
    271    275   35.0    0.1443   0.1524      0.1390 
   1016   1019   34.9    0.1467   0.1520      0.1390 
    273    277   35.3    0.1448   0.1529      0.1390 
   1016   1017   35.8    0.1470   0.1520      0.1390 
    275    279   34.5    0.1447   0.1508      0.1390 
   1019   1023   33.4    0.1463   0.1511      0.1390 
    277    279   34.5    0.1447   0.1519      0.1390 
   1021   1025   33.2    0.1461   0.1511      0.1390 
   1023   1025   33.2    0.1462   0.1507      0.1390 
    159    162   34.9    0.1429   0.1518      0.1390 
    159    160   35.8    0.1429   0.1523      0.1390 
   1102   1106   34.1    0.1463   0.1516      0.1390 
   1106   1108   34.0    0.1462   0.1515      0.1390 
   1099   1102   34.6    0.1461   0.1516      0.1390 
   1099   1100   34.5    0.1460   0.1519      0.1390 
   1100   1104   34.0    0.1463   0.1515      0.1390 
   1104   1108   34.1    0.1464   0.1512      0.1390 
Step=   14, Dmax= 1.9e-02 nm, Epot= -4.69749e+05 Fmax= 4.07991e+03, atom=
252 
Step=   15, Dmax= 2.2e-02 nm, Epot= -4.69925e+05 Fmax= 5.60899e+03, atom=
261 
Step=   16, Dmax= 2.7e-02 nm, Epot= -4.70705e+05 Fmax= 5.45189e+03, atom=
252 
Step=   18, Dmax= 1.6e-02 nm, Epot= -4.73964e+05 Fmax= 2.48190e+03, atom=
261 
Step=   20, Dmax= 9.6e-03 nm, Epot= -4.74966e+05 Fmax= 2.70939e+03, atom=
252 
Step=   21, Dmax= 1.2e-02 nm, Epot= -4.75907e+05 Fmax= 2.89559e+03, atom=
261 
Step=   22, Dmax= 1.4e-02 nm, Epot= -4.76591e+05 Fmax= 3.99485e+03, atom=
252 
Step=   23, Dmax= 1.7e-02 nm, Epot= -4.77447e+05 Fmax= 4.04995e+03, atom=
159 
Step=   24, Dmax= 2.0e-02 nm, Epot= -4.77488e+05 Fmax= 5.14109e+03, atom=
159 
Step=   25, Dmax= 2.4e-02 nm, Epot= -4.77732e+05 Fmax= 5.38157e+03, atom=
159 
Step=   27, Dmax= 1.4e-02 nm, Epot= -4.80794e+05 Fmax= 1.66386e+03, atom=
159 
Step=   29, Dmax= 8.6e-03 nm, Epot= -4.81524e+05 Fmax= 2.89830e+03, atom=
159 
Step=   30, Dmax= 1.0e-02 nm, Epot= -4.82318e+05 Fmax= 2.35166e+03, atom=
159 
Step=   31, Dmax= 1.2e-02 nm, Epot= -4.82749e+05 Fmax= 3.86449e+03, atom=
159 
Step=   32, Dmax= 1.5e-02 nm, Epot= -4.83525e+05 Fmax= 3.49726e+03, atom=
159 
Step=   34, Dmax= 8.9e-03 nm, Epot= -4.84525e+05 Fmax= 1.11416e+03, atom=
159 
Step=   35, Dmax= 1.1e-02 nm, Epot= -4.85311e+05 Fmax= 3.96327e+03, atom=
159 
Step=   36, Dmax= 1.3e-02 nm, Epot= -4.86295e+05 Fmax= 2.41624e+03, atom=
159 
Step=   38, Dmax= 7.7e-03 nm, Epot= -4.86920e+05 Fmax= 1.60263e+03, atom=
159 
Step=   39, Dmax= 9.3e-03 nm, Epot= -4.87412e+05 Fmax= 3.14316e+03, atom=
159 
Step=   40, Dmax= 1.1e-02 nm, Epot= -4.88053e+05 Fmax= 2.47491e+03, atom=
159 
Step=   41, Dmax= 1.3e-02 nm, Epot= -4.88222e+05 Fmax= 4.11196e+03, atom=
159 
Step=   42, Dmax= 1.6e-02 nm, Epot= -4.88825e+05 Fmax= 3.73410e+03, atom=
159 
Step=   44, Dmax= 9.6e-03 nm, Epot= -4.89765e+05 Fmax= 1.20178e+03, atom=
159 
Step=   45, Dmax= 1.2e-02 nm, Epot= -4.90094e+05 Fmax= 4.22621e+03, atom=
159 
Step=   46, Dmax= 1.4e-02 nm, Epot= -4.91028e+05 Fmax= 2.55233e+03, atom=
159 
Step=   48, Dmax= 8.3e-03 nm, Epot= -4.91564e+05 Fmax= 1.78402e+03, atom=
159 
Step=   49, Dmax= 1.0e-02 nm, Epot= -4.91831e+05 Fmax= 3.28629e+03, atom=
159 
Step=   50, Dmax= 1.2e-02 nm, Epot= -4.92363e+05 Fmax= 2.73460e+03, atom=
159 
Step=   52, Dmax= 7.2e-03 nm, Epot= -4.92922e+05 Fmax= 9.94135e+02, atom=
159 

writing lowest energy coordinates. 

Back Off! I just backed up em_constrain.gro to ./#em_constrain.gro.1# 

Steepest Descents converged to Fmax < 1000 in 53 steps 
Potential Energy  = -4.9292250e+05 
Maximum force     =  9.9413483e+02 on atom 159 
Norm of force     =  6.9268021e+01 

There are 4 LINCS WARNING at : 
1.Gly273-Ser277 
2.Gln582-Gln585 
3.Gly34-Gly38 
4.Asn919-Asn920 

They are all bonds that rotated more than 30 degrees 

my .mdp : 
title               =  bovin 
cpp                 =  /usr/bin/cpp ; the c pre-processor 
define              =  -DFLEXIBLE 
constraints         =  all-bonds   
integrator          =  steep 
dt                  =  0.002	; ps ! 
nsteps              =  2000 
nstlist             =  10 
ns_type             =  grid 
rlist               =  1.0 
coulombtype         =  PME 
rcoulomb            =  1.0 
rvdw                =  1.4 
fourierspacing        = 0.12 
fourier_nx	 =  0 
fourier_ny	 =  0 
fourier_nz	 =  0 
pme_order	 =  4 
ewald_rtol	 =  1e-5 
optimize_fft	 =  yes 
; 
;        Energy minimizing stuff 
; 
emtol               =  1000.0 
emstep              =0.01 
; OPTIONS FOR WEAK COUPLING ALGORITHMS 
; Temperature coupling   
tcoupl                   = No 
nsttcouple               = -1 
nh-chain-length          = 10 
; Groups to couple separately 
tc-grps                  = 
; Time constant (ps) and reference temperature (K) 
tau-t                    = 
ref-t                    = 
; Pressure coupling     
Pcoupl                   = No 
Pcoupltype               = Isotropic 
nstpcouple               = -1 

; Time constant (ps), compressibility (1/bar) and reference P (bar) 
tau-p                    = 1 
compressibility          = 
ref-p                    = 
; Scaling of reference coordinates, No, All or COM 
refcoord_scaling         = No 
; Random seed for Andersen thermostat 
andersen_seed            = 815131 

; GENERATE VELOCITIES FOR STARTUP RUN 
gen-vel                  = no 
gen-temp                 = 293 
gen-seed                 = 173529 

I known something wrong in my system, but I don't known where it is ? 

Could you help me to find it out? Thank you very much! 

maggin




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