the following is ma result when i entered the command        mdrun -
deffnm nvt




[root@localhost gromacs-4.5.3]# mdrun -deffnm nvt
                         :-)  G  R  O  M  A  C  S  (-:

               GRoups of Organic Molecules in ACtion for Science

                            :-)  VERSION 4.5.3  (-:

        Written by Emile Apol, Rossen Apostolov, Herman J.C.
Berendsen,
      Aldert van Buuren, Pär Bjelkmar, Rudi van Drunen, Anton
Feenstra,
        Gerrit Groenhof, Peter Kasson, Per Larsson, Pieter
Meulenhoff,
           Teemu Murtola, Szilard Pall, Sander Pronk, Roland Schulz,
                Michael Shirts, Alfons Sijbers, Peter Tieleman,

               Berk Hess, David van der Spoel, and Erik Lindahl.

       Copyright (c) 1991-2000, University of Groningen, The
Netherlands.
            Copyright (c) 2001-2010, The GROMACS development team at
        Uppsala University & The Royal Institute of Technology,
Sweden.
            check out http://www.gromacs.org for more information.

         This program is free software; you can redistribute it and/or
          modify it under the terms of the GNU General Public License
         as published by the Free Software Foundation; either version
2
             of the License, or (at your option) any later version.

                                :-)  mdrun  (-:

Option     Filename  Type         Description
------------------------------------------------------------
  -s        nvt.tpr  Input        Run input file: tpr tpb tpa
  -o        nvt.trr  Output       Full precision trajectory: trr trj
cpt
  -x        nvt.xtc  Output, Opt. Compressed trajectory (portable xdr
format)
-cpi        nvt.cpt  Input, Opt.  Checkpoint file
-cpo        nvt.cpt  Output, Opt. Checkpoint file
  -c        nvt.gro  Output       Structure file: gro g96 pdb etc.
  -e        nvt.edr  Output       Energy file
  -g        nvt.log  Output       Log file
-dhdl       nvt.xvg  Output, Opt. xvgr/xmgr file
-field      nvt.xvg  Output, Opt. xvgr/xmgr file
-table      nvt.xvg  Input, Opt.  xvgr/xmgr file
-tablep     nvt.xvg  Input, Opt.  xvgr/xmgr file
-tableb     nvt.xvg  Input, Opt.  xvgr/xmgr file
-rerun      nvt.trr  Input, Opt.  Trajectory: xtc trr trj gro g96 pdb
cpt
-tpi        nvt.xvg  Output, Opt. xvgr/xmgr file
-tpid       nvt.xvg  Output, Opt. xvgr/xmgr file
 -ei        nvt.edi  Input, Opt.  ED sampling input
 -eo        nvt.edo  Output, Opt. ED sampling output
  -j        nvt.gct  Input, Opt.  General coupling stuff
 -jo        nvt.gct  Output, Opt. General coupling stuff
-ffout      nvt.xvg  Output, Opt. xvgr/xmgr file
-devout     nvt.xvg  Output, Opt. xvgr/xmgr file
-runav      nvt.xvg  Output, Opt. xvgr/xmgr file
 -px        nvt.xvg  Output, Opt. xvgr/xmgr file
 -pf        nvt.xvg  Output, Opt. xvgr/xmgr file
-mtx        nvt.mtx  Output, Opt. Hessian matrix
 -dn        nvt.ndx  Output, Opt. Index file

Option       Type   Value   Description
------------------------------------------------------
-[no]h       bool   no      Print help info and quit
-[no]version bool   no      Print version info and quit
-nice        int    0       Set the nicelevel
-deffnm      string nvt     Set the default filename for all file
options
-xvg         enum   xmgrace  xvg plot formatting: xmgrace, xmgr or
none
-[no]pd      bool   no      Use particle decompostion
-dd          vector 0 0 0   Domain decomposition grid, 0 is optimize
-nt          int    0       Number of threads to start (0 is guess)
-npme        int    -1      Number of separate nodes to be used for
PME, -1
                            is guess
-ddorder     enum   interleave  DD node order: interleave, pp_pme or
cartesian
-[no]ddcheck bool   yes     Check for all bonded interactions with DD
-rdd         real   0       The maximum distance for bonded
interactions with
                            DD (nm), 0 is determine from initial
coordinates
-rcon        real   0       Maximum distance for P-LINCS (nm), 0 is
estimate
-dlb         enum   auto    Dynamic load balancing (with DD): auto, no
or yes
-dds         real   0.8     Minimum allowed dlb scaling of the DD cell
size
-gcom        int    -1      Global communication frequency
-[no]v       bool   no      Be loud and noisy
-[no]compact bool   yes     Write a compact log file
-[no]seppot  bool   no      Write separate V and dVdl terms for each
                            interaction type and node to the log
file(s)
-pforce      real   -1      Print all forces larger than this (kJ/mol
nm)
-[no]reprod  bool   no      Try to avoid optimizations that affect
binary
                            reproducibility
-cpt         real   15      Checkpoint interval (minutes)
-[no]cpnum   bool   no      Keep and number checkpoint files
-[no]append  bool   yes     Append to previous output files when
continuing
                            from checkpoint instead of adding the
simulation
                            part number to all file names
-maxh        real   -1      Terminate after 0.99 times this time
(hours)
-multi       int    0       Do multiple simulations in parallel
-replex      int    0       Attempt replica exchange every # steps
-reseed      int    -1      Seed for replica exchange, -1 is generate
a seed
-[no]ionize  bool   no      Do a simulation including the effect of an
X-Ray
                            bombardment on your system


Back Off! I just backed up nvt.log to ./#nvt.log.6#
Reading file nvt.tpr, VERSION 4.5.3 (single precision)

Back Off! I just backed up nvt.trr to ./#nvt.trr.6#

Back Off! I just backed up nvt.edr to ./#nvt.edr.6#
starting mdrun 'Protein in water'
5000 steps,     10.0 ps.

Step 0, time 0 (ps)  LINCS WARNING
relative constraint deviation after LINCS:
rms 254.970621, max 23208.900391 (between atoms 412 and 413)
bonds that rotated more than 30 degrees:
 atom 1 atom 2  angle  previous, current, constraint length
   6387   6388   90.0    0.1090   0.1555      0.1090
   4436   4437   90.1    0.1090   0.1236      0.1090
   4324   4325   90.0    0.1090   0.7974      0.1090
   4303   4304   90.1    0.1090   0.1417      0.1090
   4226   4227   63.0    0.1090   0.1096      0.1090
   3761   3762   90.4    0.1080   0.3299      0.1080
   3255   3257   35.0    0.1343   0.1358      0.1343
   3255   3256   90.0    0.1080   3.7774      0.1080
   3253   3254   90.4    0.1080   0.1175      0.1080
   3252   3255   35.8    0.1335   0.1372      0.1335
   3158   3159   90.0    0.1090   0.1430      0.1090
   2981   2982   39.3    0.1090   0.1092      0.1090
   2622   2624   90.0    0.1090   0.2783      0.1090
   2135   2136   90.0    0.1090   0.1386      0.1090
    453    455   36.4    0.1449   0.1940      0.1449
    453    454   43.6    0.1010   0.1519      0.1010
    451    453  124.0    0.1335   0.1858      0.1335
    451    452  118.9    0.1229   0.2184      0.1229
    436    439   35.5    0.1529   0.1909      0.1529
    436    438   42.4    0.1090   0.1509      0.1090
    436    437   41.7    0.1090   0.1491      0.1090
    433    436  135.1    0.1529   0.1449      0.1529
    433    435  115.3    0.1090   0.1940      0.1090
    433    434  117.1    0.1090   0.1943      0.1090
    431    451  101.0    0.1522   2.3397      0.1522
    431    433  101.8    0.1529   2.2716      0.1529
    431    432  102.5    0.1090   2.3463      0.1090
    429    431  101.9    0.1449   8.9042      0.1449
    429    430  102.0    0.1010   8.0492      0.1010
    427    429   98.5    0.1335  26.3947      0.1335
    427    428   98.3    0.1229  24.7635      0.1229
    423    426  100.5    0.1090   1.3891      0.1090
    423    425   99.8    0.1090   1.3961      0.1090
    423    424   99.8    0.1090   1.3968      0.1090
    419    422   94.0    0.1090   8.5287      0.1090
    419    421   95.1    0.1090   7.2151      0.1090
    419    420   95.2    0.1090   7.1888      0.1090
    416    423   96.9    0.1529   7.2402      0.1529
    416    418   96.2    0.1090   7.0079      0.1090
    416    417   96.5    0.1090   6.9782      0.1090
    414    419   93.5    0.1529  32.3572      0.1529
    414    416   93.7    0.1529  33.5792      0.1529
    414    415   93.8    0.1090  29.8089      0.1090
    412    427   92.8    0.1522 104.5719      0.1522
    412    414   92.3    0.1529  96.8648      0.1529
    412    413   90.1    0.1090 2529.8792      0.1090
    410    412   92.3    0.1449  97.4995      0.1449
    410    411   95.1    0.1010  23.6972      0.1010
    408    410   95.4    0.1335  27.9529      0.1335
    408    409  103.3    0.1229   7.9893      0.1229
    404    407   48.8    0.1090   0.1697      0.1090
    404    406   48.8    0.1090   0.1695      0.1090
    404    405   49.2    0.1090   0.1709      0.1090
    400    403   49.6    0.1090   0.1723      0.1090
    400    402   49.2    0.1090   0.1712      0.1090
    400    401   49.6    0.1090   0.1699      0.1090
    398    404  118.9    0.1529   0.2370      0.1529
    398    400  118.7    0.1529   0.2396      0.1529
    398    399  109.4    0.1090   0.2621      0.1090
    396    408  105.2    0.1522   7.8556      0.1522
    396    398  102.3    0.1529   2.3503      0.1529
    396    397  102.2    0.1090   2.4204      0.1090
    394    396  101.0    0.1449   2.3903      0.1449
    394    395  117.4    0.1010   0.2084      0.1010
    392    394  149.0    0.1335   0.1589      0.1335
    392    393   33.0    0.1229   0.1588      0.1229
    354    355   90.0    0.1090   1.9108      0.1090
    319    321   90.0    0.1090   0.5796      0.1090
    319    320   34.1    0.1090   0.1097      0.1090
    194    195   52.0    0.1090   0.1092      0.1090
    149    150   46.0    0.1090   0.1088      0.1090
    107    110   82.2    0.1529   0.1990      0.1529
    107    109   90.0    0.1090   0.6371      0.1090
    107    108   90.0    0.1090   0.2027      0.1090
    105    107   76.8    0.1529   0.2081      0.1529
     43     44   90.0    0.1090   0.1685      0.1090

step 0: Water molecule starting at atom 41635 can not be settled.
Check for bad contacts and/or reduce the timestep if appropriate.

Back Off! I just backed up step0b.pdb to ./#step0b.pdb.6#

Back Off! I just backed up step0c.pdb to ./#step0c.pdb.6#
Wrote pdb files with previous and current coordinates
Segmentation fault








please help me out

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